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test_cache.py

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test_cache.py

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from abc import ABCMeta, abstractmethod
from classes import typeclass
@typeclass
def my_typeclass(instance) -> int:
"""Example typeclass."""
class _MyABC(object, metaclass=ABCMeta):
@abstractmethod
def get_number(self) -> int:
"""Example abstract method."""
class _MyConcrete(_MyABC):
def get_number(self) -> int:
"""Concrete method."""
return 1
class _MyRegistered(object):
def get_number(self) -> int:
"""Would be registered in ``_MyABC`` later."""
return 2
def _my_int(instance: int) -> int:
return instance
def _my_abc(instance: _MyABC) -> int:
return instance.get_number()
def test_cache_concrete(clear_cache) -> None: # noqa: WPS218
"""Ensures that cache invalidation for ABC types work correctly."""
with clear_cache(my_typeclass):
assert not my_typeclass._dispatch_cache # noqa: WPS437
my_typeclass.instance(_MyABC)(_my_abc)
assert not my_typeclass._dispatch_cache # noqa: WPS437
assert my_typeclass(_MyConcrete()) == 1
assert _MyConcrete in my_typeclass._dispatch_cache # noqa: WPS437
_MyABC.register(_MyRegistered)
assert my_typeclass(_MyRegistered()) == 2 # type: ignore
assert _MyRegistered in my_typeclass._dispatch_cache # noqa: WPS437
def test_cached_calls(clear_cache) -> None:
"""Ensures that regular types trigger cache."""
with clear_cache(my_typeclass):
my_typeclass.instance(int)(_my_int)
assert not my_typeclass._dispatch_cache # noqa: WPS437
assert my_typeclass(1)
assert my_typeclass._dispatch_cache # noqa: WPS437
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