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]>
134 lines
3.6 KiB
Python
134 lines
3.6 KiB
Python
"""Unit tests for ObjectRepositoryInterface."""
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from io import BytesIO
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import pytest
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from python_repositories.interfaces.object_repository_interface import (
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ObjectRepositoryInterface,
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)
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class InMemoryObjectRepo:
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"""Plain class that satisfies ObjectRepositoryInterface without inheritance."""
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def get(self, object_name: str) -> BytesIO | None:
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return None
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def put(
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self,
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object_name: str,
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data: BytesIO,
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content_type: str = "application/octet-stream",
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) -> None:
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pass
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def delete(self, object_name: str) -> None:
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pass
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def list_objects(self, prefix: str = "") -> list[str]:
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return []
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def accepts_object_repo(repo: ObjectRepositoryInterface) -> None:
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"""Type-checking hook for ObjectRepositoryInterface structural subtyping."""
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repo.get("object")
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def test_instantiation_fails_when_get_not_implemented() -> None:
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"""Test that instantiation fails if get is not implemented."""
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class Incomplete(ObjectRepositoryInterface):
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"""A class that does not implement get."""
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def put(
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self,
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object_name: str,
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data: BytesIO,
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content_type: str = "application/octet-stream",
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) -> None:
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pass
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def delete(self, object_name: str) -> None:
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pass
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def list_objects(self, prefix: str = "") -> list[str]:
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return []
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_put_not_implemented() -> None:
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"""Test that instantiation fails if put is not implemented."""
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class Incomplete(ObjectRepositoryInterface):
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"""A class that does not implement put."""
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def get(self, object_name: str) -> BytesIO | None:
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return None
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def delete(self, object_name: str) -> None:
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pass
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def list_objects(self, prefix: str = "") -> list[str]:
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return []
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_delete_not_implemented() -> None:
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"""Test that instantiation fails if delete is not implemented."""
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class Incomplete(ObjectRepositoryInterface):
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"""A class that does not implement delete."""
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def get(self, object_name: str) -> BytesIO | None:
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return None
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def put(
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self,
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object_name: str,
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data: BytesIO,
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content_type: str = "application/octet-stream",
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) -> None:
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pass
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def list_objects(self, prefix: str = "") -> list[str]:
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return []
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with pytest.raises(TypeError):
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_ = Incomplete() # type: ignore
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def test_instantiation_fails_when_list_objects_not_implemented() -> None:
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"""Test that instantiation fails if list_objects is not implemented."""
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class Incomplete(ObjectRepositoryInterface):
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"""A class that does not implement list_objects."""
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def get(self, object_name: str) -> BytesIO | None:
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return None
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def put(
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self,
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object_name: str,
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data: BytesIO,
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content_type: str = "application/octet-stream",
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) -> None:
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pass
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def delete(self, object_name: str) -> 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 ObjectRepositoryInterface structurally."""
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repo: ObjectRepositoryInterface = InMemoryObjectRepo()
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accepts_object_repo(repo)
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assert isinstance(repo, ObjectRepositoryInterface)
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