Start on test_types

Author: EliahKagan

test/deprecation/test_types.py

@@ -0,0 +1,39 @@
+"""Tests for dynamic and static characteristics of git.types module attributes."""
+
+import sys
+
+if sys.version_info >= (3, 8):
+    from typing import Literal
+else:
+    from typing_extensions import Literal
+
+import pytest
+
+import git.types
+
+
+def test_cannot_access_undefined() -> None:
+    """Accessing a bogus attribute in git.types remains a dynamic and static error."""
+    with pytest.raises(AttributeError):
+        git.types.foo  # type: ignore[attr-defined]
+
+
+def test_lit_commit_ish() -> None:
+    """ """
+    # It would be fine to test attribute access rather than a "from" import. But a
+    # "from" import is more likely to appear in actual usage, so it is used here.
+    with pytest.deprecated_call() as ctx:
+        from git.types import Lit_commit_ish
+
+    # As noted in test_toplevel.test_util_alias_import, there may be multiple warnings,
+    # but all with the same message.
+    (message,) = {str(entry.message) for entry in ctx}
+    assert "Lit_commit_ish is deprecated." in message
+    assert 'Literal["commit", "tag", "blob", "tree"]' in message, "Has old definition."
+    assert 'Literal["commit", "tag"]' in message, "Has new definition."
+    assert "GitObjectTypeString" in message, "Has new type name for old definition."
+
+    _: Lit_commit_ish = "commit"  # type: ignore[valid-type]
+
+    # It should be as documented (even though deliberately unusable in static checks).
+    assert Lit_commit_ish == Literal["commit", "tag"]