tests: str(datafiles) instead of a longer thing

Replace some popular copypasta.

This important-looking invocation:

    os.path.join(datafiles.dirname, datafiles.basename)

is equivalent to this shorter invocation:

    project = str(datafiles)

It seems like it's very popular copypasta, replace it with the shorter
one thus:

    # Use 'gsed' or 'sed' etc. as appropriate for your system.
    git config --global alias.sub '!f() { git grep --name-only --null "$1" | gxargs --null gsed --in-place --expression "s/$1/$2/g" ; }; f'
    git sub 'os.path.join(datafiles.dirname, datafiles.basename)' 'str(datafiles)'

72 files changed, 327 insertions, 327 deletions

diff --git a/tests/artifactcache/expiry.py b/tests/artifactcache/expiry.py
index e39357534..38c0e21f0 100644
--- a/tests/artifactcache/expiry.py
+++ b/tests/artifactcache/expiry.py
@@ -39,7 +39,7 @@ DATA_DIR = os.path.join(
 # not have enough space left.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_expires(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
@@ -81,7 +81,7 @@ def test_artifact_expires(cli, datafiles):
 ])
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_too_large(cli, datafiles, size):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
@@ -99,7 +99,7 @@ def test_artifact_too_large(cli, datafiles, size):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_expiry_order(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
     checkout = os.path.join(project, 'workspace')
 
@@ -156,7 +156,7 @@ def test_expiry_order(cli, datafiles):
 # wouldn't it?
 @pytest.mark.datafiles(DATA_DIR)
 def test_keep_dependencies(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
@@ -202,7 +202,7 @@ def test_keep_dependencies(cli, datafiles):
 # Assert that we never delete a dependency required for a build tree
 @pytest.mark.datafiles(DATA_DIR)
 def test_never_delete_required(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
@@ -254,7 +254,7 @@ def test_never_delete_required(cli, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_never_delete_required_track(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
@@ -346,7 +346,7 @@ def test_never_delete_required_track(cli, datafiles):
 ])
 @pytest.mark.datafiles(DATA_DIR)
 def test_invalid_cache_quota(cli, datafiles, quota, err_domain, err_reason):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     os.makedirs(os.path.join(project, 'elements'))
 
     cli.configure({
@@ -397,7 +397,7 @@ def test_invalid_cache_quota(cli, datafiles, quota, err_domain, err_reason):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_cleanup_first(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     cli.configure({
diff --git a/tests/cachekey/cachekey.py b/tests/cachekey/cachekey.py
index 2bc60582a..bfeb89a8b 100644
--- a/tests/cachekey/cachekey.py
+++ b/tests/cachekey/cachekey.py
@@ -158,7 +158,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(HAVE_OSTREE is False, reason="ostree is not available")
 @pytest.mark.datafiles(DATA_DIR)
 def test_cache_key(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Workaround bug in recent versions of setuptools: newer
     # versions of setuptools fail to preserve symbolic links
@@ -228,7 +228,7 @@ def test_keys_stable_over_targets(cli, datafiles):
     target1 = 'elements/key-stability/t1.bst'
     target2 = 'elements/key-stability/t2.bst'
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     full_graph_result = cli.run(project=project, args=[
         'show',
         '--format', '%{name}::%{full-key}',
diff --git a/tests/elements/filter.py b/tests/elements/filter.py
index 94a704c92..56e4c2b5a 100644
--- a/tests/elements/filter.py
+++ b/tests/elements/filter.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_include(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'output-include.bst'])
     result.assert_success()
 
@@ -32,7 +32,7 @@ def test_filter_include(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_include_dynamic(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'output-dynamic-include.bst'])
     result.assert_success()
 
@@ -46,7 +46,7 @@ def test_filter_include_dynamic(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_exclude(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'output-exclude.bst'])
     result.assert_success()
 
@@ -59,7 +59,7 @@ def test_filter_exclude(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_orphans(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'output-orphans.bst'])
     result.assert_success()
 
@@ -71,7 +71,7 @@ def test_filter_orphans(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_deps_ok(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'deps-permitted.bst'])
     result.assert_success()
 
@@ -85,35 +85,35 @@ def test_filter_deps_ok(datafiles, cli):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_forbid_sources(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'forbidden-source.bst'])
     result.assert_main_error(ErrorDomain.ELEMENT, 'element-forbidden-sources')
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_forbid_multi_bdep(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'forbidden-multi-bdep.bst'])
     result.assert_main_error(ErrorDomain.ELEMENT, 'filter-bdepend-wrong-count')
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_forbid_no_bdep(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'forbidden-no-bdep.bst'])
     result.assert_main_error(ErrorDomain.ELEMENT, 'filter-bdepend-wrong-count')
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_forbid_also_rdep(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'forbidden-also-rdep.bst'])
     result.assert_main_error(ErrorDomain.ELEMENT, 'filter-bdepend-also-rdepend')
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_workspace_open(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace_dir = os.path.join(tmpdir.dirname, tmpdir.basename, "workspace")
     result = cli.run(project=project, args=['workspace', 'open', '--directory', workspace_dir, 'deps-permitted.bst'])
     result.assert_success()
@@ -124,7 +124,7 @@ def test_filter_workspace_open(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_workspace_open_multi(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(cwd=project, project=project, args=['workspace', 'open', 'deps-permitted.bst',
                                                          'output-orphans.bst'])
     result.assert_success()
@@ -133,7 +133,7 @@ def test_filter_workspace_open_multi(datafiles, cli):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_workspace_build(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tempdir = os.path.join(tmpdir.dirname, tmpdir.basename)
     workspace_dir = os.path.join(tempdir, "workspace")
     result = cli.run(project=project, args=['workspace', 'open', '--directory', workspace_dir, 'output-orphans.bst'])
@@ -151,7 +151,7 @@ def test_filter_workspace_build(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_workspace_close(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tempdir = os.path.join(tmpdir.dirname, tmpdir.basename)
     workspace_dir = os.path.join(tempdir, "workspace")
     result = cli.run(project=project, args=['workspace', 'open', '--directory', workspace_dir, 'output-orphans.bst'])
@@ -171,7 +171,7 @@ def test_filter_workspace_close(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_workspace_reset(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tempdir = os.path.join(tmpdir.dirname, tmpdir.basename)
     workspace_dir = os.path.join(tempdir, "workspace")
     result = cli.run(project=project, args=['workspace', 'open', '--directory', workspace_dir, 'output-orphans.bst'])
@@ -474,7 +474,7 @@ def test_filter_track_multi_exclude(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_include_with_indirect_deps(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=[
         'build', 'output-include-with-indirect-deps.bst'])
     result.assert_success()
@@ -494,7 +494,7 @@ def test_filter_include_with_indirect_deps(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_filter_fails_for_nonexisting_domain(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'output-include-nonexistent-domain.bst'])
     result.assert_main_error(ErrorDomain.STREAM, None)
 
diff --git a/tests/examples/autotools.py b/tests/examples/autotools.py
index 8a411b7a3..9aeafa510 100644
--- a/tests/examples/autotools.py
+++ b/tests/examples/autotools.py
@@ -21,7 +21,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_autotools_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     # Check that the project can be built correctly.
@@ -44,7 +44,7 @@ def test_autotools_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_autotools_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     result.assert_success()
diff --git a/tests/examples/developing.py b/tests/examples/developing.py
index 7da97931a..e12787f95 100644
--- a/tests/examples/developing.py
+++ b/tests/examples/developing.py
@@ -22,7 +22,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_autotools_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     # Check that the project can be built correctly.
@@ -43,7 +43,7 @@ def test_autotools_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_run_unmodified_hello(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     result.assert_success()
@@ -57,7 +57,7 @@ def test_run_unmodified_hello(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX, reason='Only available on linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_open_workspace(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace_dir = os.path.join(str(tmpdir), "workspace_hello")
 
     result = cli.run(project=project, args=['workspace', 'open', '-f', '--directory', workspace_dir, 'hello.bst', ])
@@ -76,7 +76,7 @@ def test_open_workspace(cli, tmpdir, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_make_change_in_workspace(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace_dir = os.path.join(str(tmpdir), "workspace_hello")
 
     result = cli.run(project=project, args=['workspace', 'open', '-f', '--directory', workspace_dir, 'hello.bst'])
diff --git a/tests/examples/first-project.py b/tests/examples/first-project.py
index 0956673fb..4d1e29d31 100644
--- a/tests/examples/first-project.py
+++ b/tests/examples/first-project.py
@@ -20,7 +20,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX, reason='Only available on linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_first_project_build_checkout(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
diff --git a/tests/examples/flatpak-autotools.py b/tests/examples/flatpak-autotools.py
index 410e6c5ee..647cd788f 100644
--- a/tests/examples/flatpak-autotools.py
+++ b/tests/examples/flatpak-autotools.py
@@ -40,7 +40,7 @@ def workaround_setuptools_bug(project):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_OSTREE, reason='Only available on linux with ostree')
 @pytest.mark.datafiles(DATA_DIR)
 def test_autotools_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     workaround_setuptools_bug(project)
 
@@ -63,7 +63,7 @@ def test_autotools_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_OSTREE, reason='Only available on linux with ostree')
 @pytest.mark.datafiles(DATA_DIR)
 def test_autotools_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workaround_setuptools_bug(project)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
diff --git a/tests/examples/integration-commands.py b/tests/examples/integration-commands.py
index 542fc8bed..053447956 100644
--- a/tests/examples/integration-commands.py
+++ b/tests/examples/integration-commands.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_integration_commands_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     assert result.exit_code == 0
@@ -31,7 +31,7 @@ def test_integration_commands_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_integration_commands_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     assert result.exit_code == 0
diff --git a/tests/examples/junctions.py b/tests/examples/junctions.py
index 621ca1c17..4bd72d8a3 100644
--- a/tests/examples/junctions.py
+++ b/tests/examples/junctions.py
@@ -20,7 +20,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'callHello.bst'])
     result.assert_success()
@@ -32,7 +32,7 @@ def test_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_shell_call_hello(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'callHello.bst'])
     result.assert_success()
@@ -46,7 +46,7 @@ def test_shell_call_hello(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX, reason='Only available on linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_open_cross_junction_workspace(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace_dir = os.path.join(str(tmpdir), "workspace_hello_junction")
 
     result = cli.run(project=project,
diff --git a/tests/examples/running-commands.py b/tests/examples/running-commands.py
index 0623d5a44..f201d2fa8 100644
--- a/tests/examples/running-commands.py
+++ b/tests/examples/running-commands.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_running_commands_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     assert result.exit_code == 0
@@ -31,7 +31,7 @@ def test_running_commands_build(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_running_commands_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['build', 'hello.bst'])
     assert result.exit_code == 0
diff --git a/tests/format/assertion.py b/tests/format/assertion.py
index 8e112658f..cfab105b6 100644
--- a/tests/format/assertion.py
+++ b/tests/format/assertion.py
@@ -23,7 +23,7 @@ DATA_DIR = os.path.join(
     ('ordered-assertion.bst', 'True', 'True', "It's not horsy time yet"),
 ])
 def test_assertion_cli(cli, datafiles, target, opt_pony, opt_horsy, assertion):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         '--option', 'pony', opt_pony,
         '--option', 'horsy', opt_horsy,
diff --git a/tests/format/project.py b/tests/format/project.py
index 031c5540a..b9b5898be 100644
--- a/tests/format/project.py
+++ b/tests/format/project.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR))
 def test_missing_project_conf(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['workspace', 'list'])
     result.assert_main_error(ErrorDomain.LOAD, LoadErrorReason.MISSING_PROJECT_CONF)
 
@@ -124,7 +124,7 @@ def test_project_unsupported(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'element-path'))
 def test_missing_element_path_directory(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['workspace', 'list'])
     result.assert_main_error(ErrorDomain.LOAD,
                              LoadErrorReason.MISSING_FILE)
@@ -132,7 +132,7 @@ def test_missing_element_path_directory(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'element-path'))
 def test_element_path_not_a_directory(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     path = os.path.join(project, 'elements')
     for _file_type in filetypegenerator.generate_file_types(path):
         result = cli.run(project=project, args=['workspace', 'list'])
@@ -145,7 +145,7 @@ def test_element_path_not_a_directory(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'local-plugin'))
 def test_missing_local_plugin_directory(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['workspace', 'list'])
     result.assert_main_error(ErrorDomain.LOAD,
                              LoadErrorReason.MISSING_FILE)
@@ -153,7 +153,7 @@ def test_missing_local_plugin_directory(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'local-plugin'))
 def test_local_plugin_not_directory(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     path = os.path.join(project, 'plugins')
     for _file_type in filetypegenerator.generate_file_types(path):
         result = cli.run(project=project, args=['workspace', 'list'])
diff --git a/tests/format/variables.py b/tests/format/variables.py
index 928ad24ec..fe8d8ae8a 100644
--- a/tests/format/variables.py
+++ b/tests/format/variables.py
@@ -43,7 +43,7 @@ def print_warning(msg):
 ])
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'defaults'))
 def test_defaults(cli, datafiles, target, varname, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show', '--deps', 'none', '--format', '%{vars}', target
     ])
@@ -69,7 +69,7 @@ def test_defaults(cli, datafiles, target, varname, expected):
 ])
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'overrides'))
 def test_overrides(cli, datafiles, target, varname, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show', '--deps', 'none', '--format', '%{vars}', target
     ])
@@ -80,7 +80,7 @@ def test_overrides(cli, datafiles, target, varname, expected):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'missing_variables'))
 def test_missing_variable(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show', '--deps', 'none', '--format', '%{config}', 'manual.bst'
     ])
@@ -93,7 +93,7 @@ def test_missing_variable(cli, datafiles):
 def test_cyclic_variables(cli, datafiles):
     print_warning("Performing cyclic test, if this test times out it will " +
                   "exit the test sequence")
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         "build", "cyclic.bst"
     ])
diff --git a/tests/frontend/artifact.py b/tests/frontend/artifact.py
index 7ce9c337c..eadc6d443 100644
--- a/tests/frontend/artifact.py
+++ b/tests/frontend/artifact.py
@@ -37,7 +37,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_log(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Get the cache key of our test element
     result = cli.run(project=project, silent=True, args=[
@@ -72,7 +72,7 @@ def test_artifact_log(cli, datafiles):
 # to the current project state
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_delete_element(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'target.bst'
 
     # Build the element and ensure it's cached
@@ -88,7 +88,7 @@ def test_artifact_delete_element(cli, tmpdir, datafiles):
 # Test that we can delete an artifact by specifying its ref.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_delete_artifact(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'target.bst'
 
     # Configure a local cache
@@ -117,7 +117,7 @@ def test_artifact_delete_artifact(cli, tmpdir, datafiles):
 # Test the `bst artifact delete` command with multiple, different arguments.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_delete_element_and_artifact(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'target.bst'
     dep = 'compose-all.bst'
 
@@ -153,7 +153,7 @@ def test_artifact_delete_element_and_artifact(cli, tmpdir, datafiles):
 # that is not present in the cache.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_delete_unbuilt_artifact(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'target.bst'
 
     # delete it, just in case it's there
@@ -175,7 +175,7 @@ def test_artifact_delete_unbuilt_artifact(cli, tmpdir, datafiles):
 # throw an Exception when trying to prune the cache.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_delete_pulled_artifact_without_buildtree(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'target.bst'
 
     # Set up remote and local shares
diff --git a/tests/frontend/buildcheckout.py b/tests/frontend/buildcheckout.py
index a0af90b58..dc3c5e4d4 100644
--- a/tests/frontend/buildcheckout.py
+++ b/tests/frontend/buildcheckout.py
@@ -38,7 +38,7 @@ def strict_args(args, strict):
     ("non-strict", "hardlinks"),
 ])
 def test_build_checkout(datafiles, cli, strict, hardlinks):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     # First build it
@@ -70,7 +70,7 @@ def test_build_checkout(datafiles, cli, strict, hardlinks):
 
 @pytest.mark.datafiles(DATA_DIR + "_world")
 def test_build_default_all(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=['build'])
 
     result.assert_success()
@@ -88,7 +88,7 @@ def test_build_default_all(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR + "_default")
 def test_build_default(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=['build'])
 
     result.assert_success()
@@ -102,7 +102,7 @@ def test_build_default(cli, datafiles):
     ("non-strict", "hardlinks"),
 ])
 def test_build_invalid_suffix(datafiles, cli, strict, hardlinks):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=strict_args(['build', 'target.foo'], strict))
     result.assert_main_error(ErrorDomain.LOAD, "bad-element-suffix")
@@ -113,7 +113,7 @@ def test_build_invalid_suffix(datafiles, cli, strict, hardlinks):
     ("non-strict", "hardlinks"),
 ])
 def test_build_invalid_suffix_dep(datafiles, cli, strict, hardlinks):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # target2.bst depends on an element called target.foo
     result = cli.run(project=project, args=strict_args(['build', 'target2.bst'], strict))
@@ -123,7 +123,7 @@ def test_build_invalid_suffix_dep(datafiles, cli, strict, hardlinks):
 @pytest.mark.skipif(IS_WINDOWS, reason='Not available on Windows')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_invalid_filename_chars(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'invalid-chars|<>-in-name.bst'
 
     # The name of this file contains characters that are not allowed by
@@ -140,7 +140,7 @@ def test_build_invalid_filename_chars(datafiles, cli):
 @pytest.mark.skipif(IS_WINDOWS, reason='Not available on Windows')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_invalid_filename_chars_dep(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'invalid-chars|<>-in-name.bst'
 
     # The name of this file contains characters that are not allowed by
@@ -158,7 +158,7 @@ def test_build_invalid_filename_chars_dep(datafiles, cli):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("deps", [("run"), ("none"), ("build")])
 def test_build_checkout_deps(datafiles, cli, deps):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = "checkout-deps.bst"
 
@@ -200,7 +200,7 @@ def test_build_checkout_deps(datafiles, cli, deps):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_unbuilt(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     # Check that checking out an unbuilt element fails nicely
@@ -210,7 +210,7 @@ def test_build_checkout_unbuilt(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_tarball(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout.tar')
 
     result = cli.run(project=project, args=['build', 'target.bst'])
@@ -232,7 +232,7 @@ def test_build_checkout_tarball(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_tarball_stdout(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tarball = os.path.join(cli.directory, 'tarball.tar')
 
     result = cli.run(project=project, args=['build', 'target.bst'])
@@ -257,7 +257,7 @@ def test_build_checkout_tarball_stdout(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_tarball_mtime_nonzero(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tarpath = os.path.join(cli.directory, 'mtime_tar.tar')
 
     result = cli.run(project=project, args=['build', 'target.bst'])
@@ -277,7 +277,7 @@ def test_build_checkout_tarball_mtime_nonzero(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_tarball_is_deterministic(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tarball1 = os.path.join(cli.directory, 'tarball1.tar')
     tarball2 = os.path.join(cli.directory, 'tarball2.tar')
 
@@ -312,7 +312,7 @@ def test_build_checkout_tarball_is_deterministic(datafiles, cli):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("hardlinks", [("copies"), ("hardlinks")])
 def test_build_checkout_nonempty(datafiles, cli, hardlinks):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     filename = os.path.join(checkout, "file.txt")
 
@@ -344,7 +344,7 @@ def test_build_checkout_nonempty(datafiles, cli, hardlinks):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("hardlinks", [("copies"), ("hardlinks")])
 def test_build_checkout_force(datafiles, cli, hardlinks):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     filename = os.path.join(checkout, "file.txt")
 
@@ -387,7 +387,7 @@ def test_build_checkout_force(datafiles, cli, hardlinks):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_force_tarball(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     tarball = os.path.join(cli.directory, 'tarball.tar')
 
     result = cli.run(project=project, args=['build', 'target.bst'])
@@ -412,7 +412,7 @@ def test_build_checkout_force_tarball(datafiles, cli):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_install_to_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element = 'installed-to-build.bst'
 
     # Attempt building the element
@@ -427,7 +427,7 @@ def test_install_to_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -461,7 +461,7 @@ def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -513,7 +513,7 @@ def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_junction(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -560,7 +560,7 @@ def test_build_checkout_junction(cli, tmpdir, datafiles):
 # Test that default targets work with projects with junctions
 @pytest.mark.datafiles(DATA_DIR + "_world")
 def test_build_checkout_junction_default_targets(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -606,7 +606,7 @@ def test_build_checkout_junction_default_targets(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_workspaced_junction(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -669,7 +669,7 @@ def test_build_checkout_workspaced_junction(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_checkout_cross_junction(datafiles, cli, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     checkout = os.path.join(cli.directory, 'checkout')
@@ -689,7 +689,7 @@ def test_build_checkout_cross_junction(datafiles, cli, tmpdir):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_junction_short_notation(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -730,7 +730,7 @@ def test_build_junction_short_notation(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_junction_short_notation_filename(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -771,7 +771,7 @@ def test_build_junction_short_notation_filename(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_junction_short_notation_with_junction(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -798,7 +798,7 @@ def test_build_junction_short_notation_with_junction(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_junction_transitive_short_notation_with_junction(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
diff --git a/tests/frontend/buildtrack.py b/tests/frontend/buildtrack.py
index 89024e96b..2d8d0e383 100644
--- a/tests/frontend/buildtrack.py
+++ b/tests/frontend/buildtrack.py
@@ -54,7 +54,7 @@ def create_element(repo, name, path, dependencies, ref=None):
 ])
 def test_build_track(cli, datafiles, tmpdir, ref_storage,
                      track_targets, exceptions, tracked):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
 
@@ -164,7 +164,7 @@ def test_build_track(cli, datafiles, tmpdir, ref_storage,
 ])
 def test_build_track_update(cli, datafiles, tmpdir, track_targets,
                             exceptions, tracked):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
 
@@ -221,7 +221,7 @@ def test_build_track_update(cli, datafiles, tmpdir, track_targets,
 ])
 def test_build_track_inconsistent(cli, datafiles, tmpdir,
                                   track_targets, exceptions):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
 
@@ -267,7 +267,7 @@ def test_build_track_inconsistent(cli, datafiles, tmpdir,
 @pytest.mark.datafiles(os.path.join(DATA_DIR))
 @pytest.mark.parametrize("strict", ['--strict', '--no-strict'])
 def test_build_track_track_first(cli, datafiles, tmpdir, strict):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
 
diff --git a/tests/frontend/completions.py b/tests/frontend/completions.py
index 8e4a85dab..3876dcf15 100644
--- a/tests/frontend/completions.py
+++ b/tests/frontend/completions.py
@@ -300,7 +300,7 @@ def test_help_commands(cli, cmd, word_idx, expected):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project'))
 def test_argument_artifact(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Build an import element with no dependencies (as there will only be ONE cache key)
     result = cli.run(project=project, args=['build', 'import-bin.bst'])  # Has no dependencies
diff --git a/tests/frontend/compose_splits.py b/tests/frontend/compose_splits.py
index ecce1dd72..adce813bd 100644
--- a/tests/frontend/compose_splits.py
+++ b/tests/frontend/compose_splits.py
@@ -18,7 +18,7 @@ DATA_DIR = os.path.join(
 ])
 @pytest.mark.datafiles(DATA_DIR)
 def test_compose_splits(datafiles, cli, target):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
 
     # First build it
diff --git a/tests/frontend/configurable_warnings.py b/tests/frontend/configurable_warnings.py
index b44a1a1c1..fe522f33a 100644
--- a/tests/frontend/configurable_warnings.py
+++ b/tests/frontend/configurable_warnings.py
@@ -36,7 +36,7 @@ def get_project(fatal_warnings):
 
 
 def build_project(datafiles, fatal_warnings):
-    project_path = os.path.join(datafiles.dirname, datafiles.basename)
+    project_path = str(datafiles)
 
     project = get_project(fatal_warnings)
 
diff --git a/tests/frontend/fetch.py b/tests/frontend/fetch.py
index ca67ca376..1a2c40602 100644
--- a/tests/frontend/fetch.py
+++ b/tests/frontend/fetch.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(TOP_DIR, 'project')
 
 @pytest.mark.datafiles(os.path.join(TOP_DIR, 'project_world'))
 def test_fetch_default_targets(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'fetch-test.bst'
 
@@ -54,7 +54,7 @@ def test_fetch_default_targets(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(TOP_DIR, 'consistencyerror'))
 def test_fetch_consistency_error(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # When the error occurs outside of the scheduler at load time,
     # then the SourceError is reported directly as the main error.
@@ -64,7 +64,7 @@ def test_fetch_consistency_error(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(TOP_DIR, 'consistencyerror'))
 def test_fetch_consistency_bug(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # FIXME:
     #
@@ -81,7 +81,7 @@ def test_fetch_consistency_bug(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -131,7 +131,7 @@ def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
diff --git a/tests/frontend/logging.py b/tests/frontend/logging.py
index 322e1490b..4036a4693 100644
--- a/tests/frontend/logging.py
+++ b/tests/frontend/logging.py
@@ -21,7 +21,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_default_logging(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     bin_files_path = os.path.join(project, 'files', 'bin-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'fetch-test-git.bst'
@@ -53,7 +53,7 @@ def test_default_logging(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_custom_logging(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     bin_files_path = os.path.join(project, 'files', 'bin-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'fetch-test-git.bst'
@@ -91,7 +91,7 @@ def test_custom_logging(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_failed_build_listing(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_names = []
     for i in range(3):
         element_name = 'testfail-{}.bst'.format(i)
diff --git a/tests/frontend/order.py b/tests/frontend/order.py
index 4f5d5654f..cd75aa6b7 100644
--- a/tests/frontend/order.py
+++ b/tests/frontend/order.py
@@ -77,7 +77,7 @@ def create_element(project, name, dependencies):
 ])
 @pytest.mark.parametrize("operation", [('show'), ('fetch'), ('build')])
 def test_order(cli, datafiles, operation, target, template, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Configure to only allow one fetcher at a time, make it easy to
     # determine what is being planned in what order.
diff --git a/tests/frontend/pull.py b/tests/frontend/pull.py
index faaa87ba0..950fd90fc 100644
--- a/tests/frontend/pull.py
+++ b/tests/frontend/pull.py
@@ -47,7 +47,7 @@ def assert_not_shared(cli, share, project, element_name):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_all(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
@@ -90,7 +90,7 @@ def test_push_pull_all(cli, tmpdir, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR + '_world')
 def test_push_pull_default_targets(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
@@ -140,7 +140,7 @@ def test_push_pull_default_targets(cli, tmpdir, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_pull_secondary_cache(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as share1,\
         create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2')) as share2:
@@ -181,7 +181,7 @@ def test_pull_secondary_cache(cli, tmpdir, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_specific_remote(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'goodartifactshare')) as good_share,\
         create_artifact_share(os.path.join(str(tmpdir), 'badartifactshare')) as bad_share:
@@ -230,7 +230,7 @@ def test_push_pull_specific_remote(cli, tmpdir, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_non_strict(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
         # First build the target element and push to the remote.
@@ -279,7 +279,7 @@ def test_push_pull_non_strict(cli, tmpdir, datafiles):
 # Regression test for https://gitlab.com/BuildStream/buildstream/issues/202
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_track_non_strict(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
@@ -322,7 +322,7 @@ def test_push_pull_track_non_strict(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_cross_junction(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
         subproject_path = os.path.join(project, 'files', 'sub-project')
@@ -353,7 +353,7 @@ def test_push_pull_cross_junction(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_pull_missing_blob(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
@@ -395,7 +395,7 @@ def test_pull_missing_blob(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_pull_missing_notifies_user(caplog, cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     caplog.set_level(1)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
@@ -415,7 +415,7 @@ def test_pull_missing_notifies_user(caplog, cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_remote_option(caplog, cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     caplog.set_level(1)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as shareuser,\
diff --git a/tests/frontend/push.py b/tests/frontend/push.py
index ab6b455f2..919ce3a84 100644
--- a/tests/frontend/push.py
+++ b/tests/frontend/push.py
@@ -126,7 +126,7 @@ def test_push(cli, tmpdir, datafiles):
 #
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_all(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
@@ -175,7 +175,7 @@ def test_push_all(cli, tmpdir, datafiles):
 # Regression test for https://gitlab.com/BuildStream/buildstream/issues/233.
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_after_pull(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Set up two artifact shares.
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as share1,\
@@ -226,7 +226,7 @@ def test_push_after_pull(cli, tmpdir, datafiles):
 # the incoming artifact.
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_expires(cli, datafiles, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     # Create an artifact share (remote artifact cache) in the tmpdir/artifactshare
@@ -277,7 +277,7 @@ def test_artifact_expires(cli, datafiles, tmpdir):
 # to the remote share
 @pytest.mark.datafiles(DATA_DIR)
 def test_artifact_too_large(cli, datafiles, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     # Create an artifact share (remote cache) in tmpdir/artifactshare
@@ -313,7 +313,7 @@ def test_artifact_too_large(cli, datafiles, tmpdir):
 # Test that when an element is pulled recently, it is not considered the LRU element.
 @pytest.mark.datafiles(DATA_DIR)
 def test_recently_pulled_artifact_does_not_expire(cli, datafiles, tmpdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = 'elements'
 
     # Create an artifact share (remote cache) in tmpdir/artifactshare
@@ -399,7 +399,7 @@ def test_push_cross_junction(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_already_cached(caplog, cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     caplog.set_level(1)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
@@ -422,7 +422,7 @@ def test_push_already_cached(caplog, cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_remote_option(caplog, cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     caplog.set_level(1)
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as shareuser,\
diff --git a/tests/frontend/rebuild.py b/tests/frontend/rebuild.py
index 67eab9bde..cf517f3c1 100644
--- a/tests/frontend/rebuild.py
+++ b/tests/frontend/rebuild.py
@@ -21,7 +21,7 @@ def strict_args(args, strict):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("strict", ["strict", "non-strict"])
 def test_rebuild(datafiles, cli, strict):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # First build intermediate target.bst
     result = cli.run(project=project, args=strict_args(['build', 'target.bst'], strict))
diff --git a/tests/frontend/show.py b/tests/frontend/show.py
index a95a2d529..bb2fc2ee2 100644
--- a/tests/frontend/show.py
+++ b/tests/frontend/show.py
@@ -26,7 +26,7 @@ DATA_DIR = os.path.join(
     ('compose-all.bst', '%{state}', 'waiting')
 ])
 def test_show(cli, datafiles, target, fmt, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show',
         '--deps', 'none',
@@ -44,13 +44,13 @@ def test_show(cli, datafiles, target, fmt, expected):
     "invalid_element_path",
 ))
 def test_show_invalid_element_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     cli.run(project=project, silent=True, args=['show', "foo.bst"])
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project_default'))
 def test_show_default(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show'])
 
@@ -64,7 +64,7 @@ def test_show_default(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project_fail'))
 def test_show_fail(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show'])
 
@@ -79,7 +79,7 @@ def test_show_fail(cli, datafiles):
     ('compose-all.bst', 'import-bin.bst', ['import-dev.bst', 'compose-all.bst'])
 ])
 def test_show_except_simple(cli, datafiles, target, except_, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, silent=True, args=[
         'show',
         '--deps', 'all',
@@ -166,7 +166,7 @@ def test_show_except_simple(cli, datafiles, target, except_, expected):
     ]),
 ])
 def test_show_except(cli, datafiles, targets, exceptions, expected):
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     results = cli.get_pipeline(basedir, targets, except_=exceptions, scope='all')
     if results != expected:
         raise AssertionError("Expected elements:\n{}\nInstead received elements:\n{}"
@@ -178,7 +178,7 @@ def test_show_except(cli, datafiles, targets, exceptions, expected):
 ###############################################################
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project'))
 def test_parallel_order(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     elements = ['multiple_targets/order/0.bst',
                 'multiple_targets/order/1.bst']
 
@@ -207,7 +207,7 @@ def test_parallel_order(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project'))
 def test_target_is_dependency(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     elements = ['multiple_targets/dependency/zebry.bst',
                 'multiple_targets/dependency/horsey.bst']
 
@@ -227,7 +227,7 @@ def test_target_is_dependency(cli, datafiles):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("element_name", ['junction-dep.bst', 'junction.bst:import-etc.bst'])
 def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage, element_name):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -279,7 +279,7 @@ def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage, element_name):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("element_name", ['junction-dep.bst', 'junction.bst:import-etc.bst'])
 def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage, element_name):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -314,7 +314,7 @@ def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage, element_name
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project'))
 @pytest.mark.parametrize("element_name", ['junction-dep.bst', 'junction.bst:import-etc.bst'])
 def test_fetched_junction(cli, tmpdir, datafiles, element_name):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -413,7 +413,7 @@ def test_exceed_max_recursion_depth(cli, tmpdir, dependency_depth):
     ('%{runtime-deps}', '[import-bin.bst]')
 ])
 def test_format_deps(cli, datafiles, dep_kind, expected_deps):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     target = 'checkout-deps.bst'
     result = cli.run(project=project, silent=True, args=[
         'show',
diff --git a/tests/frontend/source_checkout.py b/tests/frontend/source_checkout.py
index 6e21e2d87..c43bea6bd 100644
--- a/tests/frontend/source_checkout.py
+++ b/tests/frontend/source_checkout.py
@@ -40,7 +40,7 @@ def generate_remote_import_element(input_path, output_path):
 )
 def test_source_checkout(datafiles, cli, tmpdir_factory, with_workspace, guess_element):
     tmpdir = tmpdir_factory.mktemp("")
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout')
     target = 'checkout-deps.bst'
     workspace = os.path.join(str(tmpdir), 'workspace')
@@ -63,7 +63,7 @@ def test_source_checkout(datafiles, cli, tmpdir_factory, with_workspace, guess_e
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize('force_flag', ['--force', '-f'])
 def test_source_checkout_force(datafiles, cli, force_flag):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout')
     target = 'checkout-deps.bst'
 
@@ -78,7 +78,7 @@ def test_source_checkout_force(datafiles, cli, force_flag):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_source_checkout_tar(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout.tar')
     target = 'checkout-deps.bst'
 
@@ -96,7 +96,7 @@ def test_source_checkout_tar(datafiles, cli):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize('deps', [('build'), ('none'), ('run'), ('all')])
 def test_source_checkout_deps(datafiles, cli, deps):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout')
     target = 'checkout-deps.bst'
 
@@ -124,7 +124,7 @@ def test_source_checkout_deps(datafiles, cli, deps):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_source_checkout_except(datafiles, cli):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout')
     target = 'checkout-deps.bst'
 
@@ -147,7 +147,7 @@ def test_source_checkout_except(datafiles, cli):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize('fetch', [(False), (True)])
 def test_source_checkout_fetch(datafiles, cli, fetch):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'source-checkout')
     target = 'remote-import-dev.bst'
     target_path = os.path.join(project, 'elements', target)
@@ -177,7 +177,7 @@ def test_source_checkout_fetch(datafiles, cli, fetch):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_source_checkout_build_scripts(cli, tmpdir, datafiles):
-    project_path = os.path.join(datafiles.dirname, datafiles.basename)
+    project_path = str(datafiles)
     element_name = 'source-bundle/source-bundle-hello.bst'
     normal_name = 'source-bundle-source-bundle-hello'
     checkout = os.path.join(str(tmpdir), 'source-checkout')
@@ -194,7 +194,7 @@ def test_source_checkout_build_scripts(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_source_checkout_tar_buildscripts(cli, tmpdir, datafiles):
-    project_path = os.path.join(datafiles.dirname, datafiles.basename)
+    project_path = str(datafiles)
     element_name = 'source-bundle/source-bundle-hello.bst'
     normal_name = 'source-bundle-source-bundle-hello'
     tar_file = os.path.join(str(tmpdir), 'source-checkout.tar')
diff --git a/tests/frontend/track.py b/tests/frontend/track.py
index 2660b25de..b3b063f69 100644
--- a/tests/frontend/track.py
+++ b/tests/frontend/track.py
@@ -32,7 +32,7 @@ def generate_element(repo, element_path, dep_name=None):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_track_single(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_dep_name = 'track-test-dep.bst'
@@ -130,7 +130,7 @@ def test_track_optional(cli, tmpdir, datafiles, ref_storage):
 @pytest.mark.parametrize("cross_junction", [('cross'), ('nocross')])
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_track_cross_junction(cli, tmpdir, datafiles, cross_junction, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files')
     target_path = os.path.join(project, 'target.bst')
     subtarget_path = os.path.join(project, 'subproject', 'subtarget.bst')
@@ -218,7 +218,7 @@ def test_track_cross_junction(cli, tmpdir, datafiles, cross_junction, ref_storag
 
 @pytest.mark.datafiles(os.path.join(TOP_DIR, 'consistencyerror'))
 def test_track_consistency_error(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Track the element causing a consistency error
     result = cli.run(project=project, args=['source', 'track', 'error.bst'])
@@ -228,7 +228,7 @@ def test_track_consistency_error(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(TOP_DIR, 'consistencyerror'))
 def test_track_consistency_bug(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Track the element causing an unhandled exception
     result = cli.run(project=project, args=['source', 'track', 'bug.bst'])
@@ -240,7 +240,7 @@ def test_track_consistency_bug(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
@@ -274,7 +274,7 @@ def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 def test_junction_element(cli, tmpdir, datafiles, ref_storage):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     element_path = os.path.join(project, 'elements', 'junction-dep.bst')
diff --git a/tests/frontend/workspace.py b/tests/frontend/workspace.py
index e570c2899..204cfb7a8 100644
--- a/tests/frontend/workspace.py
+++ b/tests/frontend/workspace.py
@@ -58,9 +58,9 @@ class WorkspaceCreator():
         self.datafiles = datafiles
 
         if not project_path:
-            project_path = os.path.join(datafiles.dirname, datafiles.basename)
+            project_path = str(datafiles)
         else:
-            shutil.copytree(os.path.join(datafiles.dirname, datafiles.basename), project_path)
+            shutil.copytree(str(datafiles), project_path)
 
         self.project_path = project_path
         self.bin_files_path = os.path.join(project_path, 'files', 'bin-files')
@@ -672,7 +672,7 @@ def test_build(cli, tmpdir_factory, datafiles, kind, strict, from_workspace, gue
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_buildable_no_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'workspace-test-no-ref.bst'
     element_path = os.path.join(project, 'elements')
 
@@ -801,7 +801,7 @@ def test_detect_modifications(cli, tmpdir, datafiles, modification, strict):
     {"format-version": BST_WORKSPACE_FORMAT_VERSION + 1}
 ])
 def test_list_unsupported_workspace(cli, datafiles, workspace_cfg):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     os.makedirs(os.path.join(project, '.bst'))
     workspace_config_path = os.path.join(project, '.bst', 'workspaces.yml')
 
@@ -913,7 +913,7 @@ def test_list_supported_workspace(cli, tmpdir, datafiles, workspace_cfg, expecte
         _yaml.dump(node, tempfile)
         return _yaml.node_sanitize(_yaml.load(tempfile))
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     os.makedirs(os.path.join(project, '.bst'))
     workspace_config_path = os.path.join(project, '.bst', 'workspaces.yml')
 
diff --git a/tests/integration/artifact.py b/tests/integration/artifact.py
index 1f6028e4b..f9470ed6b 100644
--- a/tests/integration/artifact.py
+++ b/tests/integration/artifact.py
@@ -46,7 +46,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_cache_buildtrees(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'autotools/amhello.bst'
 
     # Create artifact shares for pull & push testing
diff --git a/tests/integration/autotools.py b/tests/integration/autotools.py
index 71cb4590f..d9dcc10ed 100644
--- a/tests/integration/autotools.py
+++ b/tests/integration/autotools.py
@@ -20,7 +20,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_autotools_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'autotools/amhello.bst'
 
@@ -42,7 +42,7 @@ def test_autotools_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_autotools_confroot_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'autotools/amhelloconfroot.bst'
 
@@ -63,7 +63,7 @@ def test_autotools_confroot_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_autotools_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'autotools/amhello.bst'
 
     result = cli.run(project=project, args=['build', element_name])
diff --git a/tests/integration/build-uid.py b/tests/integration/build-uid.py
index c5e213085..bb2e013c2 100644
--- a/tests/integration/build-uid.py
+++ b/tests/integration/build-uid.py
@@ -16,7 +16,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_uid_overridden(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-uid/build-uid.bst'
 
     project_config = {
@@ -34,7 +34,7 @@ def test_build_uid_overridden(cli, datafiles):
 @pytest.mark.skipif(not IS_LINUX or not HAVE_BWRAP, reason='Only available on linux with bubbelwrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_uid_in_project(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-uid/build-uid-1023.bst'
 
     project_config = {
@@ -52,7 +52,7 @@ def test_build_uid_in_project(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_build_uid_default(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-uid/build-uid-default.bst'
 
     result = cli.run(project=project, args=['build', element_name])
diff --git a/tests/integration/cachedfail.py b/tests/integration/cachedfail.py
index 171a21afc..34849f8bc 100644
--- a/tests/integration/cachedfail.py
+++ b/tests/integration/cachedfail.py
@@ -22,7 +22,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_build_checkout_cached_fail(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements', 'element.bst')
     checkout = os.path.join(cli.directory, 'checkout')
 
@@ -65,7 +65,7 @@ def test_build_checkout_cached_fail(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_build_depend_on_cached_fail(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dep_path = os.path.join(project, 'elements', 'dep.bst')
     target_path = os.path.join(project, 'elements', 'target.bst')
 
@@ -127,7 +127,7 @@ def test_push_cached_fail(cli, tmpdir, datafiles, on_error):
     if on_error == 'quit':
         pytest.xfail('https://gitlab.com/BuildStream/buildstream/issues/534')
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements', 'element.bst')
 
     # Write out our test target
@@ -167,7 +167,7 @@ def test_push_cached_fail(cli, tmpdir, datafiles, on_error):
 @pytest.mark.skipif(not (IS_LINUX and HAVE_BWRAP), reason='Only available with bubblewrap on Linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_host_tools_errors_are_not_cached(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements', 'element.bst')
 
     # Write out our test target
diff --git a/tests/integration/cmake.py b/tests/integration/cmake.py
index 408f0deff..ddd8ce95d 100644
--- a/tests/integration/cmake.py
+++ b/tests/integration/cmake.py
@@ -18,7 +18,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_cmake_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'cmake/cmakehello.bst'
 
@@ -34,7 +34,7 @@ def test_cmake_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_cmake_confroot_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'cmake/cmakeconfroothello.bst'
 
@@ -50,7 +50,7 @@ def test_cmake_confroot_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_cmake_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'cmake/cmakehello.bst'
 
     result = cli.run(project=project, args=['build', element_name])
diff --git a/tests/integration/compose-symlinks.py b/tests/integration/compose-symlinks.py
index ee7689e6e..6f9e0ea7d 100644
--- a/tests/integration/compose-symlinks.py
+++ b/tests/integration/compose-symlinks.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 # noinspection PyUnusedLocal
 @pytest.mark.datafiles(DATA_DIR)
 def test_compose_symlinks(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Symlinks do not survive being placed in a source distribution
     # ('setup.py sdist'), so we have to create the one we need here.
diff --git a/tests/integration/compose.py b/tests/integration/compose.py
index d15821d79..e0de38655 100644
--- a/tests/integration/compose.py
+++ b/tests/integration/compose.py
@@ -76,7 +76,7 @@ def create_compose_element(name, path, config={}):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_compose_include(cli, datafiles, include_domains,
                          exclude_domains, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'compose/compose-amhello.bst'
diff --git a/tests/integration/import.py b/tests/integration/import.py
index 85cbf9cd1..501f8aa9e 100644
--- a/tests/integration/import.py
+++ b/tests/integration/import.py
@@ -43,7 +43,7 @@ def create_import_element(name, path, source, target, source_path):
                                              '/output/subdir/test.txt']),
 ])
 def test_import(cli, datafiles, source, target, path, expected):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'import/import.bst'
diff --git a/tests/integration/make.py b/tests/integration/make.py
index 01c19ce20..581d919e7 100644
--- a/tests/integration/make.py
+++ b/tests/integration/make.py
@@ -20,7 +20,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_make_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'make/makehello.bst'
 
@@ -38,7 +38,7 @@ def test_make_build(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_make_run(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'make/makehello.bst'
 
     result = cli.run(project=project, args=['build', element_name])
diff --git a/tests/integration/manual.py b/tests/integration/manual.py
index 507434eaa..76ea1dc66 100644
--- a/tests/integration/manual.py
+++ b/tests/integration/manual.py
@@ -34,7 +34,7 @@ def create_manual_element(name, path, config, variables, environment):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_manual_element(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'import/import.bst'
@@ -68,7 +68,7 @@ strip
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_manual_element_environment(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'import/import.bst'
@@ -98,7 +98,7 @@ def test_manual_element_environment(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_manual_element_noparallel(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'import/import.bst'
@@ -133,7 +133,7 @@ def test_manual_element_noparallel(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_manual_element_logging(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'import/import.bst'
 
diff --git a/tests/integration/messages.py b/tests/integration/messages.py
index b633eefdf..3697d0bf7 100644
--- a/tests/integration/messages.py
+++ b/tests/integration/messages.py
@@ -39,7 +39,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_disable_message_lines(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'message.bst'
 
@@ -74,7 +74,7 @@ def test_disable_message_lines(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_disable_error_lines(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'message.bst'
 
diff --git a/tests/integration/pip_element.py b/tests/integration/pip_element.py
index d49e80d8d..a3f363bc8 100644
--- a/tests/integration/pip_element.py
+++ b/tests/integration/pip_element.py
@@ -21,7 +21,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_pip_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'pip/hello.bst'
@@ -61,7 +61,7 @@ def test_pip_run(cli, datafiles):
     # Create and build our test element
     test_pip_build(cli, datafiles)
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'pip/hello.bst'
 
     result = cli.run(project=project, args=['shell', element_name, '/usr/bin/hello'])
diff --git a/tests/integration/pip_source.py b/tests/integration/pip_source.py
index 7cda6d29b..6ee76005c 100644
--- a/tests/integration/pip_source.py
+++ b/tests/integration/pip_source.py
@@ -20,7 +20,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_pip_source_import(cli, datafiles, setup_pypi_repo):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'pip/hello.bst'
@@ -75,7 +75,7 @@ def test_pip_source_import(cli, datafiles, setup_pypi_repo):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_pip_source_build(cli, datafiles, setup_pypi_repo):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'pip/hello.bst'
 
diff --git a/tests/integration/pullbuildtrees.py b/tests/integration/pullbuildtrees.py
index 6a3b92723..4ed5cb86b 100644
--- a/tests/integration/pullbuildtrees.py
+++ b/tests/integration/pullbuildtrees.py
@@ -38,7 +38,7 @@ def default_state(cli, tmpdir, share):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_pullbuildtrees(cli2, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'autotools/amhello.bst'
 
     # Create artifact shares for pull & push testing
@@ -178,7 +178,7 @@ def test_pullbuildtrees(cli2, tmpdir, datafiles):
 ])
 @pytest.mark.datafiles(DATA_DIR)
 def test_invalid_cache_pullbuildtrees(cli, datafiles, value, success):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     cli.configure({
         'cache': {
diff --git a/tests/integration/sandbox-bwrap.py b/tests/integration/sandbox-bwrap.py
index b898f5fed..29227501c 100644
--- a/tests/integration/sandbox-bwrap.py
+++ b/tests/integration/sandbox-bwrap.py
@@ -22,7 +22,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not HAVE_BWRAP, reason='Only available with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_sandbox_bwrap_cleanup_build(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     # This element depends on a base image with non-empty `/tmp` folder.
     element_name = 'sandbox-bwrap/test-cleanup.bst'
 
@@ -35,7 +35,7 @@ def test_sandbox_bwrap_cleanup_build(cli, datafiles):
 @pytest.mark.skipif(not HAVE_BWRAP_JSON_STATUS, reason='Only available with bubblewrap supporting --json-status-fd')
 @pytest.mark.datafiles(DATA_DIR)
 def test_sandbox_bwrap_distinguish_setup_error(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'sandbox-bwrap/non-executable-shell.bst'
 
     result = cli.run(project=project, args=['build', element_name])
@@ -45,7 +45,7 @@ def test_sandbox_bwrap_distinguish_setup_error(cli, datafiles):
 @pytest.mark.skipif(not HAVE_BWRAP, reason='Only available with bubblewrap')
 @pytest.mark.datafiles(DATA_DIR)
 def test_sandbox_bwrap_return_subprocess(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'sandbox-bwrap/command-exit-42.bst'
 
     cli.configure({
diff --git a/tests/integration/script.py b/tests/integration/script.py
index db7da0ad5..1500af724 100644
--- a/tests/integration/script.py
+++ b/tests/integration/script.py
@@ -32,7 +32,7 @@ def create_script_element(name, path, config={}, variables={}):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_script(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'script/script-layout.bst'
@@ -60,7 +60,7 @@ def test_script(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_script_root(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'script/script-layout.bst'
@@ -92,7 +92,7 @@ def test_script_root(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_script_no_root(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'script/script-layout.bst'
 
@@ -115,7 +115,7 @@ def test_script_no_root(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_script_cwd(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_path = os.path.join(project, 'elements')
     element_name = 'script/script-layout.bst'
@@ -146,7 +146,7 @@ def test_script_cwd(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_script_layout(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'script/script-layout.bst'
 
diff --git a/tests/integration/shell.py b/tests/integration/shell.py
index 3246d108a..fb01f45ea 100644
--- a/tests/integration/shell.py
+++ b/tests/integration/shell.py
@@ -49,7 +49,7 @@ def execute_shell(cli, project, command, *, config=None, mount=None, element='ba
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_shell(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = execute_shell(cli, project, ["echo", "Ponies!"])
     assert result.exit_code == 0
@@ -60,7 +60,7 @@ def test_shell(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_executable(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = execute_shell(cli, project, ["/bin/echo", "Horseys!"])
     assert result.exit_code == 0
@@ -72,7 +72,7 @@ def test_executable(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_env_assign(cli, datafiles, animal):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     expected = animal + '\n'
 
     result = execute_shell(cli, project, ['/bin/sh', '-c', 'echo ${ANIMAL}'], config={
@@ -92,7 +92,7 @@ def test_env_assign(cli, datafiles, animal):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_env_assign_expand_host_environ(cli, datafiles, animal):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     expected = 'The animal is: {}\n'.format(animal)
 
     os.environ['BEAST'] = animal
@@ -115,7 +115,7 @@ def test_env_assign_expand_host_environ(cli, datafiles, animal):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_env_assign_isolated(cli, datafiles, animal):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = execute_shell(cli, project, ['/bin/sh', '-c', 'echo ${ANIMAL}'], isolate=True, config={
         'shell': {
             'environment': {
@@ -133,7 +133,7 @@ def test_env_assign_isolated(cli, datafiles, animal):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_no_shell(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     element_name = 'shell/no-shell.bst'
 
@@ -166,7 +166,7 @@ def test_no_shell(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_host_files(cli, datafiles, path):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     ponyfile = os.path.join(project, 'files', 'shell-mount', 'pony.txt')
     result = execute_shell(cli, project, ['cat', path], config={
         'shell': {
@@ -187,7 +187,7 @@ def test_host_files(cli, datafiles, path):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_host_files_expand_environ(cli, datafiles, path):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     hostpath = os.path.join(project, 'files', 'shell-mount')
     fullpath = os.path.join(path, 'pony.txt')
 
@@ -213,7 +213,7 @@ def test_host_files_expand_environ(cli, datafiles, path):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_isolated_no_mount(cli, datafiles, path):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     ponyfile = os.path.join(project, 'files', 'shell-mount', 'pony.txt')
     result = execute_shell(cli, project, ['cat', path], isolate=True, config={
         'shell': {
@@ -236,7 +236,7 @@ def test_isolated_no_mount(cli, datafiles, path):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_host_files_missing(cli, datafiles, optional):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     ponyfile = os.path.join(project, 'files', 'shell-mount', 'horsy.txt')
 
     if optional == "optional":
@@ -272,7 +272,7 @@ def test_host_files_missing(cli, datafiles, optional):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_cli_mount(cli, datafiles, path):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     ponyfile = os.path.join(project, 'files', 'shell-mount', 'pony.txt')
 
     result = execute_shell(cli, project, ['cat', path], mount=(ponyfile, path))
@@ -284,7 +284,7 @@ def test_cli_mount(cli, datafiles, path):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_workspace_visible(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_name = 'workspace/workspace-mount-fail.bst'
 
@@ -318,7 +318,7 @@ def test_workspace_visible(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_sysroot(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     base_element = "base/base-alpine.bst"
     # test element only needs to be something lightweight for this test
     test_element = "script/script.bst"
@@ -348,7 +348,7 @@ def test_sysroot(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_integration_devices(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'integration.bst'
 
     result = execute_shell(cli, project, ["true"], element=element_name)
@@ -362,7 +362,7 @@ def test_integration_devices(cli, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_integration_external_workspace(cli, tmpdir_factory, datafiles, build_shell, guess_element):
     tmpdir = tmpdir_factory.mktemp("")
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'autotools/amhello.bst'
     workspace_dir = os.path.join(str(tmpdir), 'workspace')
 
diff --git a/tests/integration/shellbuildtrees.py b/tests/integration/shellbuildtrees.py
index fed3c5167..c12a0d404 100644
--- a/tests/integration/shellbuildtrees.py
+++ b/tests/integration/shellbuildtrees.py
@@ -23,7 +23,7 @@ def test_buildtree_staged(cli_integration, datafiles):
     # We can only test the non interacitve case
     # The non interactive case defaults to not using buildtrees
     # for `bst shell --build`
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     res = cli_integration.run(project=project, args=['--cache-buildtrees', 'always', 'build', element_name])
@@ -39,7 +39,7 @@ def test_buildtree_staged(cli_integration, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_staged_forced_true(cli_integration, datafiles):
     # Test that if we ask for a build tree it is there.
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     res = cli_integration.run(project=project, args=['--cache-buildtrees', 'always', 'build', element_name])
@@ -56,7 +56,7 @@ def test_buildtree_staged_forced_true(cli_integration, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_staged_warn_empty_cached(cli_integration, tmpdir, datafiles):
     # Test that if we stage a cached and empty buildtree, we warn the user.
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     # Switch to a temp artifact cache dir to ensure the artifact is rebuilt,
@@ -79,7 +79,7 @@ def test_buildtree_staged_warn_empty_cached(cli_integration, tmpdir, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_staged_if_available(cli_integration, datafiles):
     # Test that a build tree can be correctly detected.
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     res = cli_integration.run(project=project, args=['--cache-buildtrees', 'always', 'build', element_name])
@@ -96,7 +96,7 @@ def test_buildtree_staged_if_available(cli_integration, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_staged_forced_false(cli_integration, datafiles):
     # Test that if we ask not to have a build tree it is not there
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     res = cli_integration.run(project=project, args=['--cache-buildtrees', 'always', 'build', element_name])
@@ -114,7 +114,7 @@ def test_buildtree_staged_forced_false(cli_integration, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_from_failure(cli_integration, datafiles):
     # Test that we can use a build tree after a failure
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree-fail.bst'
 
     res = cli_integration.run(project=project, args=['build', element_name])
@@ -133,7 +133,7 @@ def test_buildtree_from_failure(cli_integration, datafiles):
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_from_failure_option_never(cli_integration, tmpdir, datafiles):
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree-fail.bst'
 
     # Switch to a temp artifact cache dir to ensure the artifact is rebuilt,
@@ -156,7 +156,7 @@ def test_buildtree_from_failure_option_never(cli_integration, tmpdir, datafiles)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_from_failure_option_always(cli_integration, tmpdir, datafiles):
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree-fail.bst'
 
     # build with  --cache-buildtrees set to 'always', behaviour should match
@@ -182,7 +182,7 @@ def test_buildtree_from_failure_option_always(cli_integration, tmpdir, datafiles
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_pulled(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
@@ -214,7 +214,7 @@ def test_buildtree_pulled(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_buildtree_options(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'build-shell/buildtree.bst'
 
     with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
diff --git a/tests/integration/sockets.py b/tests/integration/sockets.py
index 6dc6b682c..17c3becea 100644
--- a/tests/integration/sockets.py
+++ b/tests/integration/sockets.py
@@ -16,7 +16,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_builddir_socket_ignored(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'sockets/make-builddir-socket.bst'
 
     result = cli.run(project=project, args=['build', element_name])
@@ -26,7 +26,7 @@ def test_builddir_socket_ignored(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_install_root_socket_ignored(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_name = 'sockets/make-install-root-socket.bst'
 
     result = cli.run(project=project, args=['build', element_name])
diff --git a/tests/integration/stack.py b/tests/integration/stack.py
index f8c837bbb..e75c6a450 100644
--- a/tests/integration/stack.py
+++ b/tests/integration/stack.py
@@ -17,7 +17,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_stack(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'stack/stack.bst'
 
diff --git a/tests/integration/symlinks.py b/tests/integration/symlinks.py
index 1c2f3c2a7..5752281de 100644
--- a/tests/integration/symlinks.py
+++ b/tests/integration/symlinks.py
@@ -17,7 +17,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_absolute_symlinks(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'symlinks/dangling-symlink.bst'
 
@@ -38,7 +38,7 @@ def test_absolute_symlinks(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_disallow_overlaps_inside_symlink_with_dangling_target(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'symlinks/dangling-symlink-overlap.bst'
 
@@ -53,7 +53,7 @@ def test_disallow_overlaps_inside_symlink_with_dangling_target(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_detect_symlink_overlaps_pointing_outside_sandbox(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkout = os.path.join(cli.directory, 'checkout')
     element_name = 'symlinks/symlink-to-outside-sandbox-overlap.bst'
 
diff --git a/tests/integration/workspace.py b/tests/integration/workspace.py
index fd2aff3ac..8ec6db3c8 100644
--- a/tests/integration/workspace.py
+++ b/tests/integration/workspace.py
@@ -18,7 +18,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_workspace_mount(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_name = 'workspace/workspace-mount.bst'
 
@@ -34,7 +34,7 @@ def test_workspace_mount(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_workspace_commanddir(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_name = 'workspace/workspace-commanddir.bst'
 
@@ -51,7 +51,7 @@ def test_workspace_commanddir(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_workspace_updated_dependency(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_path = os.path.join(project, 'elements')
     element_name = 'workspace/workspace-updated-dependency.bst'
@@ -105,7 +105,7 @@ def test_workspace_updated_dependency(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_workspace_update_dependency_failed(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_path = os.path.join(project, 'elements')
     element_name = 'workspace/workspace-updated-dependency-failed.bst'
@@ -180,7 +180,7 @@ def test_workspace_update_dependency_failed(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_updated_dependency_nested(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_path = os.path.join(project, 'elements')
     element_name = 'workspace/workspace-updated-dependency-nested.bst'
@@ -233,7 +233,7 @@ def test_updated_dependency_nested(cli, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_incremental_configure_commands_run_only_once(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     workspace = os.path.join(cli.directory, 'workspace')
     element_path = os.path.join(project, 'elements')
     element_name = 'workspace/incremental.bst'
diff --git a/tests/internals/loader.py b/tests/internals/loader.py
index 7663d03e3..006b5787f 100644
--- a/tests/internals/loader.py
+++ b/tests/internals/loader.py
@@ -31,7 +31,7 @@ def make_loader(basedir):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_one_file(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     element = loader.load(['elements/onefile.bst'])[0]
@@ -43,7 +43,7 @@ def test_one_file(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_missing_file(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     with pytest.raises(LoadError) as exc:
@@ -55,7 +55,7 @@ def test_missing_file(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_invalid_reference(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     with pytest.raises(LoadError) as exc:
@@ -67,7 +67,7 @@ def test_invalid_reference(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_invalid_yaml(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     with pytest.raises(LoadError) as exc:
@@ -79,7 +79,7 @@ def test_invalid_yaml(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_fail_fullpath_target(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     fullpath = os.path.join(basedir, 'elements', 'onefile.bst')
 
     with pytest.raises(LoadError) as exc:
@@ -92,7 +92,7 @@ def test_fail_fullpath_target(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_invalid_key(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     with pytest.raises(LoadError) as exc:
@@ -104,7 +104,7 @@ def test_invalid_key(datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'onefile'))
 def test_invalid_directory_load(datafiles):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     loader = make_loader(basedir)
 
     with pytest.raises(LoadError) as exc:
diff --git a/tests/internals/pluginloading.py b/tests/internals/pluginloading.py
index 675ac8540..2d997077a 100644
--- a/tests/internals/pluginloading.py
+++ b/tests/internals/pluginloading.py
@@ -32,7 +32,7 @@ def create_pipeline(tmpdir, basedir, target):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'customsource'))
 def test_customsource(datafiles, tmpdir):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     targets = create_pipeline(tmpdir, basedir, 'simple.bst')
     assert targets[0].get_kind() == "autotools"
 
@@ -40,14 +40,14 @@ def test_customsource(datafiles, tmpdir):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'customelement'))
 def test_customelement(datafiles, tmpdir):
 
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
     targets = create_pipeline(tmpdir, basedir, 'simple.bst')
     assert targets[0].get_kind() == "foo"
 
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'badversionsource'))
 def test_badversionsource(datafiles, tmpdir):
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
 
     with pytest.raises(LoadError) as exc:
         create_pipeline(tmpdir, basedir, 'simple.bst')
@@ -57,7 +57,7 @@ def test_badversionsource(datafiles, tmpdir):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'badversionelement'))
 def test_badversionelement(datafiles, tmpdir):
-    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    basedir = str(datafiles)
 
     with pytest.raises(LoadError) as exc:
         create_pipeline(tmpdir, basedir, 'simple.bst')
diff --git a/tests/plugins/deprecationwarnings/deprecationwarnings.py b/tests/plugins/deprecationwarnings/deprecationwarnings.py
index 10b93cc7a..0f61ce271 100644
--- a/tests/plugins/deprecationwarnings/deprecationwarnings.py
+++ b/tests/plugins/deprecationwarnings/deprecationwarnings.py
@@ -14,7 +14,7 @@ _DEPRECATION_WARNING = "Using deprecated plugin deprecated_plugin: {}".format(_D
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_deprecation_warning_present(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['show', 'deprecated.bst'])
     result.assert_success()
     assert _DEPRECATION_WARNING in result.stderr
@@ -22,7 +22,7 @@ def test_deprecation_warning_present(cli, datafiles):
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_suppress_deprecation_warning(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     cli.run(project=project, args=['show', 'manual.bst'])
 
     element_overrides = "elements:\n" \
diff --git a/tests/sandboxes/missing-command.py b/tests/sandboxes/missing-command.py
index a2b56d4a7..ee6d11280 100644
--- a/tests/sandboxes/missing-command.py
+++ b/tests/sandboxes/missing-command.py
@@ -14,6 +14,6 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(DATA_DIR)
 def test_missing_command(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     result = cli.run(project=project, args=['build', 'no-runtime.bst'])
     result.assert_task_error(ErrorDomain.SANDBOX, 'missing-command')
diff --git a/tests/sandboxes/missing_dependencies.py b/tests/sandboxes/missing_dependencies.py
index 19515a187..850fddaa3 100644
--- a/tests/sandboxes/missing_dependencies.py
+++ b/tests/sandboxes/missing_dependencies.py
@@ -17,7 +17,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(not IS_LINUX, reason='Only available on Linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_missing_brwap_has_nice_error_message(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements', 'element.bst')
 
     # Write out our test target
@@ -57,7 +57,7 @@ def test_old_brwap_has_nice_error_message(cli, datafiles, tmp_path):
 
     bwrap.chmod(0o755)
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements', 'element3.bst')
 
     # Write out our test target
diff --git a/tests/sources/bzr.py b/tests/sources/bzr.py
index a76814a30..0a3c345bd 100644
--- a/tests/sources/bzr.py
+++ b/tests/sources/bzr.py
@@ -19,7 +19,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(HAVE_BZR is False, reason="bzr is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR))
 def test_fetch_checkout(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), 'checkout')
 
     repo = create_repo('bzr', str(tmpdir))
diff --git a/tests/sources/deb.py b/tests/sources/deb.py
index 6e92facf6..2538efe3b 100644
--- a/tests/sources/deb.py
+++ b/tests/sources/deb.py
@@ -40,7 +40,7 @@ def _copy_deb(start_location, tmpdir):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-ref'))
 def test_no_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     assert cli.get_element_state(project, 'target.bst') == 'no reference'
 
@@ -49,7 +49,7 @@ def test_no_ref(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_url(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Try to fetch it
@@ -64,7 +64,7 @@ def test_fetch_bad_url(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Copy test deb to tmpdir
@@ -82,7 +82,7 @@ def test_fetch_bad_ref(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_track_warning(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Copy test deb to tmpdir
@@ -100,7 +100,7 @@ def test_track_warning(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_stage_default_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -128,7 +128,7 @@ def test_stage_default_basedir(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-basedir'))
 def test_stage_no_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -156,7 +156,7 @@ def test_stage_no_basedir(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_ARPY is False, reason="arpy is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'explicit-basedir'))
 def test_stage_explicit_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
diff --git a/tests/sources/generic/build_checkout.py b/tests/sources/generic/build_checkout.py
index f2dee6c60..e113b40cb 100644
--- a/tests/sources/generic/build_checkout.py
+++ b/tests/sources/generic/build_checkout.py
@@ -46,7 +46,7 @@ def strict_args(args, strict):
 @pytest.mark.parametrize("strict,kind", fetch_build_checkout_combos)
 def test_fetch_build_checkout(cli, tmpdir, datafiles, strict, kind):
     checkout = os.path.join(cli.directory, 'checkout')
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'build-test-{}.bst'.format(kind)
diff --git a/tests/sources/generic/fetch.py b/tests/sources/generic/fetch.py
index 3c7a28182..f5931f8f1 100644
--- a/tests/sources/generic/fetch.py
+++ b/tests/sources/generic/fetch.py
@@ -37,7 +37,7 @@ DATA_DIR = os.path.join(TOP_DIR, 'project')
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_fetch(cli, tmpdir, datafiles, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     bin_files_path = os.path.join(project, 'files', 'bin-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'fetch-test-{}.bst'.format(kind)
diff --git a/tests/sources/generic/track.py b/tests/sources/generic/track.py
index 76956fcdb..4726a453e 100644
--- a/tests/sources/generic/track.py
+++ b/tests/sources/generic/track.py
@@ -52,7 +52,7 @@ def generate_element(repo, element_path, dep_name=None):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track(cli, tmpdir, datafiles, ref_storage, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'track-test-{}.bst'.format(kind)
@@ -112,7 +112,7 @@ def test_track(cli, tmpdir, datafiles, ref_storage, kind):
 @pytest.mark.parametrize("amount", [(1), (10)])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track_recurse(cli, tmpdir, datafiles, kind, amount):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
 
@@ -176,7 +176,7 @@ def test_track_recurse(cli, tmpdir, datafiles, kind, amount):
 @pytest.mark.datafiles(DATA_DIR)
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track_recurse_except(cli, tmpdir, datafiles, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_dep_name = 'track-test-dep-{}.bst'.format(kind)
@@ -223,7 +223,7 @@ def test_track_recurse_except(cli, tmpdir, datafiles, kind):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_cross_junction(cli, tmpdir, datafiles, ref_storage, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(project, 'elements', 'junction.bst')
     etc_files = os.path.join(subproject_path, 'files', 'etc-files')
@@ -266,7 +266,7 @@ def test_cross_junction(cli, tmpdir, datafiles, ref_storage, kind):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track_include(cli, tmpdir, datafiles, ref_storage, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'track-test-{}.bst'.format(kind)
@@ -329,7 +329,7 @@ def test_track_include(cli, tmpdir, datafiles, ref_storage, kind):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track_include_junction(cli, tmpdir, datafiles, ref_storage, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     dev_files_path = os.path.join(project, 'files', 'dev-files')
     element_path = os.path.join(project, 'elements')
     element_name = 'track-test-{}.bst'.format(kind)
@@ -398,7 +398,7 @@ def test_track_include_junction(cli, tmpdir, datafiles, ref_storage, kind):
 @pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
 @pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
 def test_track_junction_included(cli, tmpdir, datafiles, ref_storage, kind):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     element_path = os.path.join(project, 'elements')
     subproject_path = os.path.join(project, 'files', 'sub-project')
     junction_path = os.path.join(element_path, 'junction.bst')
diff --git a/tests/sources/generic/workspace.py b/tests/sources/generic/workspace.py
index 552981a4f..ad115c1ba 100644
--- a/tests/sources/generic/workspace.py
+++ b/tests/sources/generic/workspace.py
@@ -40,9 +40,9 @@ class WorkspaceCreator():
         self.datafiles = datafiles
 
         if not project_path:
-            project_path = os.path.join(datafiles.dirname, datafiles.basename)
+            project_path = str(datafiles)
         else:
-            shutil.copytree(os.path.join(datafiles.dirname, datafiles.basename), project_path)
+            shutil.copytree(str(datafiles), project_path)
 
         self.project_path = project_path
         self.bin_files_path = os.path.join(project_path, 'files', 'bin-files')
diff --git a/tests/sources/git.py b/tests/sources/git.py
index ca22bb2fd..8922a47d7 100644
--- a/tests/sources/git.py
+++ b/tests/sources/git.py
@@ -46,7 +46,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_fetch_bad_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'repofiles' subdir
     repo = create_repo('git', str(tmpdir))
@@ -72,7 +72,7 @@ def test_fetch_bad_ref(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_checkout(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -111,7 +111,7 @@ def test_submodule_fetch_checkout(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_source_enable_explicit(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -150,7 +150,7 @@ def test_submodule_fetch_source_enable_explicit(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_source_disable(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -189,7 +189,7 @@ def test_submodule_fetch_source_disable(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_submodule_does_override(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -228,7 +228,7 @@ def test_submodule_fetch_submodule_does_override(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_submodule_individual_checkout(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -273,7 +273,7 @@ def test_submodule_fetch_submodule_individual_checkout(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_fetch_submodule_individual_checkout_explicit(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -318,7 +318,7 @@ def test_submodule_fetch_submodule_individual_checkout_explicit(cli, tmpdir, dat
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'project-override'))
 def test_submodule_fetch_project_override(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Create the submodule first from the 'subrepofiles' subdir
@@ -357,7 +357,7 @@ def test_submodule_fetch_project_override(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_track_ignore_inconsistent(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'repofiles' subdir
     repo = create_repo('git', str(tmpdir))
@@ -394,7 +394,7 @@ def test_submodule_track_ignore_inconsistent(cli, tmpdir, datafiles):
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_track_no_ref_or_track(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'repofiles' subdir
     repo = create_repo('git', str(tmpdir))
@@ -422,7 +422,7 @@ def test_submodule_track_no_ref_or_track(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 @pytest.mark.parametrize("fail", ['warn', 'error'])
 def test_ref_not_in_track(cli, tmpdir, datafiles, fail):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Make the warning an error if we're testing errors
     if fail == 'error':
@@ -465,7 +465,7 @@ def test_ref_not_in_track(cli, tmpdir, datafiles, fail):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 @pytest.mark.parametrize("fail", ['warn', 'error'])
 def test_unlisted_submodule(cli, tmpdir, datafiles, fail):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Make the warning an error if we're testing errors
     if fail == 'error':
@@ -538,7 +538,7 @@ def test_unlisted_submodule(cli, tmpdir, datafiles, fail):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 @pytest.mark.parametrize("fail", ['warn', 'error'])
 def test_track_unlisted_submodule(cli, tmpdir, datafiles, fail):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Make the warning an error if we're testing errors
     if fail == 'error':
@@ -601,7 +601,7 @@ def test_track_unlisted_submodule(cli, tmpdir, datafiles, fail):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 @pytest.mark.parametrize("fail", ['warn', 'error'])
 def test_invalid_submodule(cli, tmpdir, datafiles, fail):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Make the warning an error if we're testing errors
     if fail == 'error':
@@ -673,7 +673,7 @@ def test_invalid_submodule(cli, tmpdir, datafiles, fail):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 @pytest.mark.parametrize("fail", ['warn', 'error'])
 def test_track_invalid_submodule(cli, tmpdir, datafiles, fail):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Make the warning an error if we're testing errors
     if fail == 'error':
@@ -735,7 +735,7 @@ def test_track_invalid_submodule(cli, tmpdir, datafiles, fail):
 @pytest.mark.parametrize("ref_format", ['sha1', 'git-describe'])
 @pytest.mark.parametrize("tag,extra_commit", [(False, False), (True, False), (True, True)])
 def test_track_fetch(cli, tmpdir, datafiles, ref_format, tag, extra_commit):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'repofiles' subdir
     repo = create_repo('git', str(tmpdir))
diff --git a/tests/sources/local.py b/tests/sources/local.py
index b9201bad7..e5f6d4cdf 100644
--- a/tests/sources/local.py
+++ b/tests/sources/local.py
@@ -16,7 +16,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_missing_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Removing the local file causes preflight to fail
     localfile = os.path.join(project, 'file.txt')
@@ -30,7 +30,7 @@ def test_missing_path(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_non_regular_file_or_directory(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     localfile = os.path.join(project, 'file.txt')
 
     for _file_type in filetypegenerator.generate_file_types(localfile):
@@ -48,7 +48,7 @@ def test_non_regular_file_or_directory(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_invalid_absolute_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with open(os.path.join(project, "target.bst"), 'r') as f:
         old_yaml = f.read()
@@ -66,7 +66,7 @@ def test_invalid_absolute_path(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'invalid-relative-path'))
 def test_invalid_relative_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['show', 'target.bst'])
     result.assert_main_error(ErrorDomain.LOAD,
@@ -75,7 +75,7 @@ def test_invalid_relative_path(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_stage_file(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Build, checkout
@@ -90,7 +90,7 @@ def test_stage_file(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'directory'))
 def test_stage_directory(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Build, checkout
@@ -107,7 +107,7 @@ def test_stage_directory(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'symlink'))
 def test_stage_symlink(cli, tmpdir, datafiles):
 
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Workaround datafiles bug:
@@ -132,7 +132,7 @@ def test_stage_symlink(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'file-exists'))
 def test_stage_file_exists(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Build, checkout
     result = cli.run(project=project, args=['build', 'target.bst'])
@@ -142,7 +142,7 @@ def test_stage_file_exists(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'directory'))
 def test_stage_directory_symlink(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     symlink = os.path.join(project, 'files', 'symlink-to-subdir')
diff --git a/tests/sources/no_fetch_cached.py b/tests/sources/no_fetch_cached.py
index b7952220d..767c193d2 100644
--- a/tests/sources/no_fetch_cached.py
+++ b/tests/sources/no_fetch_cached.py
@@ -23,7 +23,7 @@ DATA_DIR = os.path.join(
 @pytest.mark.skipif(HAVE_GIT is False, reason="git is not available")
 @pytest.mark.datafiles(DATA_DIR)
 def test_no_fetch_cached(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'files' subdir
     repo = create_repo('git', str(tmpdir))
diff --git a/tests/sources/ostree.py b/tests/sources/ostree.py
index 6b390b5b6..2d4dd953a 100644
--- a/tests/sources/ostree.py
+++ b/tests/sources/ostree.py
@@ -37,7 +37,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'template'))
 def test_submodule_track_no_ref_or_track(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Create the repo from 'repofiles' subdir
     repo = create_repo('ostree', str(tmpdir))
diff --git a/tests/sources/patch.py b/tests/sources/patch.py
index 3d53c4b14..49c6594dc 100644
--- a/tests/sources/patch.py
+++ b/tests/sources/patch.py
@@ -16,7 +16,7 @@ DATA_DIR = os.path.join(
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_missing_patch(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Removing the local file causes preflight to fail
     localfile = os.path.join(project, 'file_1.patch')
@@ -30,7 +30,7 @@ def test_missing_patch(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_non_regular_file_patch(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     patch_path = os.path.join(project, 'irregular_file.patch')
     for _file_type in filetypegenerator.generate_file_types(patch_path):
@@ -46,7 +46,7 @@ def test_non_regular_file_patch(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_invalid_absolute_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     with open(os.path.join(project, "target.bst"), 'r') as f:
         old_yaml = f.read()
@@ -64,7 +64,7 @@ def test_invalid_absolute_path(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'invalid-relative-path'))
 def test_invalid_relative_path(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     result = cli.run(project=project, args=['show', 'irregular.bst'])
     result.assert_main_error(ErrorDomain.LOAD,
@@ -73,7 +73,7 @@ def test_invalid_relative_path(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_stage_and_patch(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Build, checkout
@@ -89,7 +89,7 @@ def test_stage_and_patch(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_stage_file_nonexistent_dir(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Fails at build time because it tries to patch into a non-existing directory
     result = cli.run(project=project, args=['build', 'failure-nonexistent-dir.bst'])
@@ -99,7 +99,7 @@ def test_stage_file_nonexistent_dir(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'basic'))
 def test_stage_file_empty_dir(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Fails at build time because it tries to patch with nothing else staged
     result = cli.run(project=project, args=['build', 'failure-empty-dir.bst'])
@@ -109,7 +109,7 @@ def test_stage_file_empty_dir(cli, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'separate-patch-dir'))
 def test_stage_separate_patch_dir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Track, fetch, build, checkout
@@ -125,7 +125,7 @@ def test_stage_separate_patch_dir(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'multiple-patches'))
 def test_stage_multiple_patches(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Track, fetch, build, checkout
@@ -141,7 +141,7 @@ def test_stage_multiple_patches(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'different-strip-level'))
 def test_patch_strip_level(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
     # Track, fetch, build, checkout
diff --git a/tests/sources/pip.py b/tests/sources/pip.py
index 1d1664bf1..0a0a846ef 100644
--- a/tests/sources/pip.py
+++ b/tests/sources/pip.py
@@ -23,7 +23,7 @@ def generate_project(project_dir):
 # Test that without ref, consistency is set appropriately.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-ref'))
 def test_no_ref(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project)
     assert cli.get_element_state(project, 'target.bst') == 'no reference'
 
@@ -31,7 +31,7 @@ def test_no_ref(cli, datafiles):
 # Test that pip is not allowed to be the first source
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'first-source-pip'))
 def test_first_source(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project)
     result = cli.run(project=project, args=[
         'show', 'target.bst'
@@ -43,7 +43,7 @@ def test_first_source(cli, datafiles):
 # have been specified
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-packages'))
 def test_no_packages(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project)
     result = cli.run(project=project, args=[
         'show', 'target.bst'
diff --git a/tests/sources/previous_source_access.py b/tests/sources/previous_source_access.py
index cb1c54c27..29d1f3023 100644
--- a/tests/sources/previous_source_access.py
+++ b/tests/sources/previous_source_access.py
@@ -18,7 +18,7 @@ DATA_DIR = os.path.join(
 # Test that plugins can access data from previous sources
 @pytest.mark.datafiles(DATA_DIR)
 def test_custom_transform_source(cli, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
 
     # Ensure we can track
     result = cli.run(project=project, args=[
diff --git a/tests/sources/remote.py b/tests/sources/remote.py
index f6ea9bf65..2a23895ac 100644
--- a/tests/sources/remote.py
+++ b/tests/sources/remote.py
@@ -39,7 +39,7 @@ def generate_project_file_server(server, project_dir):
 # Test that without ref, consistency is set appropriately.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-ref'))
 def test_no_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     assert cli.get_element_state(project, 'target.bst') == 'no reference'
 
@@ -48,7 +48,7 @@ def test_no_ref(cli, tmpdir, datafiles):
 # refers to 'file' but that file is not present.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'missing-file'))
 def test_missing_file(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Try to fetch it
@@ -62,7 +62,7 @@ def test_missing_file(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'path-in-filename'))
 def test_path_in_filename(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Try to fetch it
@@ -76,7 +76,7 @@ def test_path_in_filename(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'single-file'))
 def test_simple_file_build(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -109,7 +109,7 @@ def test_simple_file_build(cli, tmpdir, datafiles):
 
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'single-file-custom-name'))
 def test_simple_file_custom_name_build(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -137,7 +137,7 @@ def test_unique_key(cli, tmpdir, datafiles):
     '''This test confirms that the 'filename' parameter is honoured when it comes
     to generating a cache key for the source.
     '''
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     states = cli.get_element_states(project, [
         'target.bst', 'target-custom.bst', 'target-custom-executable.bst'
@@ -169,7 +169,7 @@ def test_unique_key(cli, tmpdir, datafiles):
 def test_executable(cli, tmpdir, datafiles):
     '''This test confirms that the 'ecxecutable' parameter is honoured.
     '''
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
     assert cli.get_element_state(project, 'target-custom-executable.bst') == "fetch needed"
diff --git a/tests/sources/tar.py b/tests/sources/tar.py
index ca6806b32..7a516459d 100644
--- a/tests/sources/tar.py
+++ b/tests/sources/tar.py
@@ -68,7 +68,7 @@ def generate_project_file_server(base_url, project_dir):
 # Test that without ref, consistency is set appropriately.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-ref'))
 def test_no_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     assert cli.get_element_state(project, 'target.bst') == 'no reference'
 
@@ -76,7 +76,7 @@ def test_no_ref(cli, tmpdir, datafiles):
 # Test that when I fetch a nonexistent URL, errors are handled gracefully and a retry is performed.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_url(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Try to fetch it
@@ -91,7 +91,7 @@ def test_fetch_bad_url(cli, tmpdir, datafiles):
 # Test that when I fetch with an invalid ref, it fails.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Create a local tar
@@ -109,7 +109,7 @@ def test_fetch_bad_ref(cli, tmpdir, datafiles):
 # Test that when tracking with a ref set, there is a warning
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_track_warning(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Create a local tar
@@ -128,7 +128,7 @@ def test_track_warning(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 @pytest.mark.parametrize("srcdir", ["a", "./a"])
 def test_stage_default_basedir(cli, tmpdir, datafiles, srcdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -157,7 +157,7 @@ def test_stage_default_basedir(cli, tmpdir, datafiles, srcdir):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-basedir'))
 @pytest.mark.parametrize("srcdir", ["a", "./a"])
 def test_stage_no_basedir(cli, tmpdir, datafiles, srcdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -186,7 +186,7 @@ def test_stage_no_basedir(cli, tmpdir, datafiles, srcdir):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'explicit-basedir'))
 @pytest.mark.parametrize("srcdir", ["a", "./a"])
 def test_stage_explicit_basedir(cli, tmpdir, datafiles, srcdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -215,7 +215,7 @@ def test_stage_explicit_basedir(cli, tmpdir, datafiles, srcdir):
 # leading paths
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'contains-links'))
 def test_stage_contains_links(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -251,7 +251,7 @@ def test_stage_contains_links(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 @pytest.mark.parametrize("srcdir", ["a", "./a"])
 def test_stage_default_basedir_lzip(cli, tmpdir, datafiles, srcdir):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -280,7 +280,7 @@ def test_stage_default_basedir_lzip(cli, tmpdir, datafiles, srcdir):
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'read-only'))
 def test_read_only_dir(cli, tmpdir, datafiles):
     try:
-        project = os.path.join(datafiles.dirname, datafiles.basename)
+        project = str(datafiles)
         generate_project(project, tmpdir)
 
         # Get the tarball in tests/sources/tar/read-only/content
@@ -397,7 +397,7 @@ def test_netrc_already_specified_user(cli, datafiles, server_type, tmpdir):
 # the netrc module is trying to find it's ~/.netrc file.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_homeless_environment(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Create a local tar
diff --git a/tests/sources/zip.py b/tests/sources/zip.py
index 3193d38ca..1c86e56d7 100644
--- a/tests/sources/zip.py
+++ b/tests/sources/zip.py
@@ -53,7 +53,7 @@ def generate_project_file_server(server, project_dir):
 # Test that without ref, consistency is set appropriately.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-ref'))
 def test_no_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     assert cli.get_element_state(project, 'target.bst') == 'no reference'
 
@@ -61,7 +61,7 @@ def test_no_ref(cli, tmpdir, datafiles):
 # Test that when I fetch a nonexistent URL, errors are handled gracefully and a retry is performed.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_url(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Try to fetch it
@@ -76,7 +76,7 @@ def test_fetch_bad_url(cli, tmpdir, datafiles):
 # Test that when I fetch with an invalid ref, it fails.
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_fetch_bad_ref(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Create a local tar
@@ -94,7 +94,7 @@ def test_fetch_bad_ref(cli, tmpdir, datafiles):
 # Test that when tracking with a ref set, there is a warning
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_track_warning(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
 
     # Create a local tar
@@ -112,7 +112,7 @@ def test_track_warning(cli, tmpdir, datafiles):
 # Test that a staged checkout matches what was tarred up, with the default first subdir
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'fetch'))
 def test_stage_default_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -140,7 +140,7 @@ def test_stage_default_basedir(cli, tmpdir, datafiles):
 # Test that a staged checkout matches what was tarred up, with an empty base-dir
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'no-basedir'))
 def test_stage_no_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")
 
@@ -168,7 +168,7 @@ def test_stage_no_basedir(cli, tmpdir, datafiles):
 # Test that a staged checkout matches what was tarred up, with an explicit basedir
 @pytest.mark.datafiles(os.path.join(DATA_DIR, 'explicit-basedir'))
 def test_stage_explicit_basedir(cli, tmpdir, datafiles):
-    project = os.path.join(datafiles.dirname, datafiles.basename)
+    project = str(datafiles)
     generate_project(project, tmpdir)
     checkoutdir = os.path.join(str(tmpdir), "checkout")