test(test[run-args]): add scalar command regressions

why: Lock down the normalization bug at both the helper layer and the public wrapper layer.
what:
- add direct tests for _normalize_command_args
- add git wrapper regression coverage for scalar string args
- add minimal hg and svn command wrapper regression tests

Author: tony

tests/_internal/test_run.py

@@ -0,0 +1,30 @@
+"""Tests for libvcs._internal.run."""
+
+from __future__ import annotations
+
+import pathlib
+
+from libvcs._internal.run import _normalize_command_args
+
+
+def test_normalize_command_args_keeps_scalar_string() -> None:
+    """Scalar strings should remain a single subprocess argument."""
+    assert _normalize_command_args("status") == ["status"]
+
+
+def test_normalize_command_args_keeps_scalar_bytes() -> None:
+    """Scalar bytes should remain a single subprocess argument."""
+    assert _normalize_command_args(b"status") == [b"status"]
+
+
+def test_normalize_command_args_expands_sequence() -> None:
+    """Sequences should be expanded element by element."""
+    assert _normalize_command_args(["status", "--short"]) == ["status", "--short"]
+
+
+def test_normalize_command_args_coerces_pathlike() -> None:
+    """Path-like values should be converted with os.fspath semantics."""
+    path = pathlib.Path("example")
+
+    assert _normalize_command_args(path) == ["example"]
+    assert _normalize_command_args([path, "status"]) == ["example", "status"]

tests/cmd/test_git.py

@@ -35,6 +35,15 @@ def test_git_init_basic(tmp_path: pathlib.Path) -> None:
     assert (tmp_path / ".git").is_dir()
 
 
+def test_git_run_accepts_scalar_string(tmp_path: pathlib.Path) -> None:
+    """Git run() should not split scalar command strings."""
+    repo = git.Git(path=tmp_path)
+
+    result = repo.run("--version")
+
+    assert result.startswith("git version ")
+
+
 def test_git_init_bare(tmp_path: pathlib.Path) -> None:
     """Test git init with bare repository."""
     repo = git.Git(path=tmp_path)

tests/cmd/test_hg.py

@@ -0,0 +1,22 @@
+"""Tests for libvcs.cmd.hg."""
+
+from __future__ import annotations
+
+import pathlib
+import shutil
+
+import pytest
+
+from libvcs.cmd.hg import Hg
+
+if not shutil.which("hg"):
+    pytestmark = pytest.mark.skip(reason="hg is not available")
+
+
+def test_hg_run_accepts_scalar_string(tmp_path: pathlib.Path) -> None:
+    """Mercurial run() should not split scalar command strings."""
+    repo = Hg(path=tmp_path)
+
+    result = repo.run("help")
+
+    assert "Mercurial Distributed SCM" in result

tests/cmd/test_svn.py

@@ -0,0 +1,22 @@
+"""Tests for libvcs.cmd.svn."""
+
+from __future__ import annotations
+
+import pathlib
+import shutil
+
+import pytest
+
+from libvcs.cmd.svn import Svn
+
+if not shutil.which("svn"):
+    pytestmark = pytest.mark.skip(reason="svn is not available")
+
+
+def test_svn_run_accepts_scalar_string(tmp_path: pathlib.Path) -> None:
+    """Subversion run() should not split scalar command strings."""
+    repo = Svn(path=tmp_path)
+
+    result = repo.run("help")
+
+    assert "usage: svn <subcommand> [options] [args]" in result