Brian Bjarke JensenandCursor
44b15cb21a
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Align test layout with the one-test-file-per-interface convention by removing structural_typing_test.py. Co-authored-by: Cursor <[email protected]>
61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
"""Unit tests for ContextAwareInterface."""
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from __future__ import annotations
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import pytest
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from python_repositories.interfaces.context_aware_interface import ContextAwareInterface
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class FakeContextManager:
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"""Plain class that satisfies ContextAwareInterface without inheritance."""
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def __enter__(self) -> FakeContextManager:
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return self
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def __exit__(
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self, exc_type: type | None, exc_val: object | None, exc_tb: object | None
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) -> None:
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pass
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def accepts_context_aware(context: ContextAwareInterface) -> None:
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"""Type-checking hook for ContextAwareInterface structural subtyping."""
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with context:
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pass
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def test_instantiation_fails_when_enter_not_implemented() -> None:
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"""Test that instantiation fails if __enter__ is not implemented."""
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class Incomplete(ContextAwareInterface):
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"""A class that does not implement __enter__."""
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def __exit__(
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self, exc_type: type | None, exc_val: object | None, exc_tb: object | None
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) -> None:
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pass
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_exit_not_implemented() -> None:
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"""Test that instantiation fails if __exit__ is not implemented."""
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class Incomplete(ContextAwareInterface):
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"""A class that does not implement __exit__."""
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def __enter__(self) -> Incomplete:
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return self
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_structural_subtyping() -> None:
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"""Test that a plain class satisfies ContextAwareInterface structurally."""
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context: ContextAwareInterface = FakeContextManager()
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accepts_context_aware(context)
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assert isinstance(context, ContextAwareInterface)
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