Added test utility for building files quickly.

And made use of it in test_egg_info.

2 files changed, 44 insertions, 11 deletions

diff --git a/setuptools/tests/files.py b/setuptools/tests/files.py
new file mode 100644
index 00000000..4364241b
--- /dev/null
+++ b/setuptools/tests/files.py
@@ -0,0 +1,32 @@
+import os
+
+
+def build_files(file_defs, prefix=""):
+    """
+    Build a set of files/directories, as described by the file_defs dictionary.
+
+    Each key/value pair in the dictionary is interpreted as a filename/contents
+    pair. If the contents value is a dictionary, a directory is created, and the
+    dictionary interpreted as the files within it, recursively.
+
+    For example:
+
+    {"README.txt": "A README file",
+     "foo": {
+        "__init__.py": "",
+        "bar": {
+            "__init__.py": "",
+        },
+        "baz.py": "# Some code",
+     }
+    }
+    """
+    for name, contents in file_defs.items():
+        full_name = os.path.join(prefix, name)
+        if isinstance(contents, dict):
+            if not os.path.exists(full_name):
+                os.makedirs(full_name)
+            build_files(contents, prefix=full_name)
+        else:
+            with open(full_name, 'w') as f:
+                f.write(contents)
diff --git a/setuptools/tests/test_egg_info.py b/setuptools/tests/test_egg_info.py
index a1caf9fd..8d831107 100644
--- a/setuptools/tests/test_egg_info.py
+++ b/setuptools/tests/test_egg_info.py
@@ -4,6 +4,7 @@ import stat
 import pytest
 
 from . import environment
+from .files import build_files
 from .textwrap import DALS
 from . import contexts
 
@@ -22,14 +23,13 @@ class TestEggInfo:
         """)
 
     def _create_project(self):
-        with open('setup.py', 'w') as f:
-            f.write(self.setup_script)
-
-        with open('hello.py', 'w') as f:
-            f.write(DALS("""
+        build_files({
+            'setup.py': self.setup_script,
+            'hello.py': DALS("""
                 def run():
                     print('hello')
-                """))
+                """)
+        })
 
     @pytest.yield_fixture
     def env(self):
@@ -44,13 +44,14 @@ class TestEggInfo:
                 for dirname in subs
             )
             list(map(os.mkdir, env.paths.values()))
-            config = os.path.join(env.paths['home'], '.pydistutils.cfg')
-            with open(config, 'w') as f:
-                f.write(DALS("""
+            build_files({
+                env.paths['home']: {
+                    '.pydistutils.cfg': DALS("""
                     [egg_info]
                     egg-base = %(egg-base)s
-                    """ % env.paths
-                ))
+                    """ % env.paths)
+                }
+            })
             yield env
 
     def test_egg_base_installed_egg_info(self, tmpdir_cwd, env):