3 files changed, 74 insertions, 9 deletions
diff --git a/testing/conftest.py b/testing/conftest.py
index c881042..d29b5dd 100644
--- a/testing/conftest.py
+++ b/testing/conftest.py
@@ -3,10 +3,10 @@ from __future__ import annotations
 import os
 from pathlib import Path
 from typing import Any
-from typing import Generator
 
 import pytest
 
+import setuptools_scm.utils
 from .wd_wrapper import WorkDir
 
 
@@ -39,13 +39,25 @@ def pytest_addoption(parser: Any) -> None:
     )
 
 
-@pytest.fixture(autouse=True)
-def debug_mode() -> Generator[None, None, None]:
-    from setuptools_scm import utils
+class DebugMode:
+    def __init__(self, monkeypatch: pytest.MonkeyPatch):
+        self.__monkeypatch = monkeypatch
+        self.__module = setuptools_scm.utils
+
+    __monkeypatch: pytest.MonkeyPatch
+
+    def enable(self) -> None:
+        self.__monkeypatch.setattr(self.__module, "DEBUG", True)
 
-    utils.DEBUG = True
-    yield
-    utils.DEBUG = False
+    def disable(self) -> None:
+        self.__monkeypatch.setattr(self.__module, "DEBUG", False)
+
+
+@pytest.fixture(autouse=True)
+def debug_mode(monkeypatch: pytest.MonkeyPatch) -> DebugMode:
+    debug_mode = DebugMode(monkeypatch)
+    debug_mode.enable()
+    return debug_mode
 
 
 @pytest.fixture
diff --git a/testing/test_cli.py b/testing/test_cli.py
new file mode 100644
index 0000000..0198111
--- /dev/null
+++ b/testing/test_cli.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import io
+from contextlib import redirect_stdout
+
+import pytest
+
+from .conftest import DebugMode
+from .test_git import wd as wd_fixture  # NOQA evil fixture reuse
+from .wd_wrapper import WorkDir
+from setuptools_scm._cli import main
+
+
+PYPROJECT_TOML = "pyproject.toml"
+PYPROJECT_SIMPLE = "[tool.setuptools_scm]"
+PYPROJECT_ROOT = '[tool.setuptools_scm]\nroot=".."'
+
+
+def get_output(args: list[str]) -> str:
+
+    with redirect_stdout(io.StringIO()) as out:
+        main(args)
+    return out.getvalue()
+
+
+def test_cli_find_pyproject(
+    wd: WorkDir, monkeypatch: pytest.MonkeyPatch, debug_mode: DebugMode
+) -> None:
+    debug_mode.disable()
+    wd.commit_testfile()
+    wd.write(PYPROJECT_TOML, PYPROJECT_SIMPLE)
+    monkeypatch.chdir(wd.cwd)
+
+    out = get_output([])
+    assert out.startswith("0.1.dev1+")
+
+    with pytest.raises(SystemExit, match="no version found for"):
+        get_output(["--root=.."])
+
+    wd.write(PYPROJECT_TOML, PYPROJECT_ROOT)
+    with pytest.raises(SystemExit, match="no version found for"):
+        print(get_output(["-c", PYPROJECT_TOML]))
+
+    with pytest.raises(SystemExit, match="no version found for"):
+
+        get_output(["-c", PYPROJECT_TOML, "--root=.."])
+
+    with pytest.warns(UserWarning, match="root .. is overridden by the cli arg ."):
+        out = get_output(["-c", PYPROJECT_TOML, "--root=."])
+    assert out.startswith("0.1.dev1+")
diff --git a/testing/test_git.py b/testing/test_git.py
index 661a5ee..105a9e0 100644
--- a/testing/test_git.py
+++ b/testing/test_git.py
@@ -15,6 +15,7 @@ from unittest.mock import patch
 
 import pytest
 
+from .conftest import DebugMode
 from .wd_wrapper import WorkDir
 from setuptools_scm import Configuration
 from setuptools_scm import format_version
@@ -31,14 +32,16 @@ pytestmark = pytest.mark.skipif(
 )
 
 
-@pytest.fixture
-def wd(wd: WorkDir, monkeypatch: pytest.MonkeyPatch) -> WorkDir:
+@pytest.fixture(name="wd")
+def wd(wd: WorkDir, monkeypatch: pytest.MonkeyPatch, debug_mode: DebugMode) -> WorkDir:
+    debug_mode.disable()
     monkeypatch.delenv("HOME", raising=False)
     wd("git init")
     wd("git config user.email test@example.com")
     wd('git config user.name "a test"')
     wd.add_command = "git add ."
     wd.commit_command = "git commit -m test-{reason}"
+    debug_mode.enable()
     return wd