fix: AssertionError when outside a vcs dir

CHANGES

@@ -21,6 +21,15 @@ $ pipx install --suffix=@next g --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Fixes
+
+- Fix `g` when running outside of a VCS directory (#24)
+
+### Tests
+
+- Use declarative, typed `NamedTuple`-style for `test_command_line` fixtures
+  (#24)
+
 ### Development
 
 - poetry: 1.8.1 -> 1.8.2
@@ -49,14 +58,17 @@ _Maintenance only, no bug fixes, or new features_
       --exec 'poetry run ruff check --select ALL . --fix --unsafe-fixes --preview --show-fixes; poetry run ruff format .; git add src tests; git commit --amend --no-edit' \
       origin/master
   ```
+
 - poetry: 1.7.1 -> 1.8.1
 
   See also: https://github.com/python-poetry/poetry/blob/1.8.1/CHANGELOG.md
+
 - ruff 0.2.2 -> 0.3.0 (#22)
 
   Related formattings. Update CI to use `ruff check .` instead of `ruff .`.
 
   See also: https://github.com/astral-sh/ruff/blob/v0.3.0/CHANGELOG.md
+
 - Strengthen linting (#21)
 
   - Add flake8-commas (COM)

src/g/__init__.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 """Package for g."""
 
+import io
+import logging
 import os
 import pathlib
 import subprocess
@@ -12,8 +14,11 @@
 
 vcspath_registry = {".git": "git", ".svn": "svn", ".hg": "hg"}
 
+log = logging.getLogger(__name__)
+
 
 def find_repo_type(path: t.Union[pathlib.Path, str]) -> t.Optional[str]:
+    """Detect repo type looking upwards."""
     for _path in [*list(pathlib.Path(path).parents), pathlib.Path(path)]:
         for p in _path.iterdir():
             if p.is_dir() and p.name in vcspath_registry:
@@ -45,6 +50,13 @@ def run(
     if cmd_args is DEFAULT:
         cmd_args = sys.argv[1:]
 
+    logging.basicConfig(level=logging.INFO, format="%(message)s")
+
+    if cmd is None:
+        msg = "No VCS found in current directory."
+        log.info(msg)
+        return None
+
     assert isinstance(cmd_args, (tuple, list))
     assert isinstance(cmd, (str, bytes, pathlib.Path))
 

tests/test_cli.py

@@ -1,5 +1,7 @@
 """Tests for g's CLI package."""
 
+import enum
+import pathlib
 import subprocess
 import typing as t
 from unittest.mock import patch
@@ -20,25 +22,95 @@ def get_output(
         return exc.output
 
 
+class EnvFlag(enum.Enum):
+    """Environmental conditions to simulate in test case."""
+
+    Git = "Git"  # Inside a git directory (like this repo)
+    Empty = "Empty"  # Empty directory (e.g. `tmp_path`)
+
+
 @pytest.mark.parametrize(
     ("argv_args", "expect_cmd"),
     [
         (["g"], "git"),
         (["g", "--help"], "git --help"),
     ],
 )
+class CommandLineTestFixture(t.NamedTuple):
+    """Test fixture for CLI params, environment, and expected result."""
+
+    # pytest internal
+    test_id: str
+
+    # env data
+    env: EnvFlag
+
+    # test data
+    argv_args: t.List[str]
+
+    # results
+    expect_cmd: t.Optional[str]
+
+
+TEST_FIXTURES: t.List[CommandLineTestFixture] = [
+    CommandLineTestFixture(
+        test_id="g-cmd-inside-git-dir",
+        env=EnvFlag.Git,
+        argv_args=["g"],
+        expect_cmd="git",
+    ),
+    CommandLineTestFixture(
+        test_id="g-cmd-help-inside-git-dir",
+        env=EnvFlag.Git,
+        argv_args=["g --help"],
+        expect_cmd="git --help",
+    ),
+    CommandLineTestFixture(
+        test_id="g-cmd-inside-empty-dir",
+        env=EnvFlag.Empty,
+        argv_args=["g"],
+        expect_cmd=None,
+    ),
+    CommandLineTestFixture(
+        test_id="g-cmd-help-inside-empty-dir",
+        env=EnvFlag.Empty,
+        argv_args=["g --help"],
+        expect_cmd=None,
+    ),
+]
+
+
+@pytest.mark.parametrize(
+    list(CommandLineTestFixture._fields),
+    TEST_FIXTURES,
+    ids=[f.test_id for f in TEST_FIXTURES],
+)
 def test_command_line(
     # capsys: pytest.CaptureFixture[str],
+    test_id: str,
+    env: EnvFlag,
     argv_args: t.List[str],
-    expect_cmd: str,
+    expect_cmd: t.Optional[str],
+    monkeypatch: pytest.MonkeyPatch,
+    tmp_path: pathlib.Path,
 ) -> None:
     """Basic CLI usage."""
     from g import sys as gsys
 
+    if env == EnvFlag.Git:
+        pass
+    elif env == EnvFlag.Empty:
+        monkeypatch.chdir(str(tmp_path))
+
     with patch.object(gsys, "argv", argv_args):
         proc = run(wait=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        assert proc is not None
-        assert proc.stdout is not None
-        captured = proc.stdout.read()
+        if expect_cmd is None:
+            assert proc is None
+        else:
+            assert proc is not None
+            assert proc.stdout is not None
+            captured = proc.stdout.read()
 
-        assert captured == get_output(expect_cmd, shell=True, stderr=subprocess.STDOUT)
+            assert captured == get_output(
+                expect_cmd, shell=True, stderr=subprocess.STDOUT
+            )