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]>
81 lines
2.2 KiB
Python
81 lines
2.2 KiB
Python
"""Unit tests for ConnectionAwareInterface."""
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import pytest
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from python_repositories.interfaces.connection_aware_interface import (
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ConnectionAwareInterface,
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)
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class FakeConnection:
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"""Plain class that satisfies ConnectionAwareInterface without inheritance."""
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def connect(self) -> None:
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pass
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def disconnect(self) -> None:
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pass
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def is_connected(self) -> bool:
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return True
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def accepts_connection_aware(connection: ConnectionAwareInterface) -> None:
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"""Type-checking hook for ConnectionAwareInterface structural subtyping."""
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connection.is_connected()
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def test_instantiation_fails_when_connect_not_implemented() -> None:
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"""Test that instantiation fails if connect is not implemented."""
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class Incomplete(ConnectionAwareInterface):
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"""A class that does not implement connect."""
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def disconnect(self) -> None:
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pass
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def is_connected(self) -> bool:
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return False
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_disconnect_not_implemented() -> None:
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"""Test that instantiation fails if disconnect is not implemented."""
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class Incomplete(ConnectionAwareInterface):
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"""A class that does not implement disconnect."""
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def connect(self) -> None:
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pass
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def is_connected(self) -> bool:
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return False
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_is_connected_not_implemented() -> None:
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"""Test that instantiation fails if is_connected is not implemented."""
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class Incomplete(ConnectionAwareInterface):
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"""A class that does not implement is_connected."""
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def connect(self) -> None:
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pass
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def disconnect(self) -> 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_structural_subtyping() -> None:
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"""Test that a plain class satisfies ConnectionAwareInterface structurally."""
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connection: ConnectionAwareInterface = FakeConnection()
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accepts_connection_aware(connection)
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assert isinstance(connection, ConnectionAwareInterface)
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