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import sys
from collections.abc import Callable
from typing import TYPE_CHECKING, Any, Protocol, TypedDict, TypeVar
import pytest
from propcache.api import under_cached_property
if sys.version_info >= (3, 11):
from typing import assert_type
_T_co = TypeVar("_T_co", covariant=True)
class APIProtocol(Protocol):
def under_cached_property(
self, func: Callable[[Any], _T_co]
) -> under_cached_property[_T_co]: ...
def test_under_cached_property(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
self._cache: dict[str, int] = {}
@propcache_module.under_cached_property
def prop(self) -> int:
return 1
@propcache_module.under_cached_property
def prop2(self) -> str:
return "foo"
a = A()
if sys.version_info >= (3, 11):
assert_type(a.prop, int)
assert a.prop == 1
if sys.version_info >= (3, 11):
assert_type(a.prop2, str)
assert a.prop2 == "foo"
def test_under_cached_property_typeddict(propcache_module: APIProtocol) -> None:
"""Test static typing passes with TypedDict."""
class _Cache(TypedDict, total=False):
prop: int
prop2: str
class A:
def __init__(self) -> None:
self._cache: _Cache = {}
@propcache_module.under_cached_property
def prop(self) -> int:
return 1
@propcache_module.under_cached_property
def prop2(self) -> str:
return "foo"
a = A()
if sys.version_info >= (3, 11):
assert_type(a.prop, int)
assert a.prop == 1
if sys.version_info >= (3, 11):
assert_type(a.prop2, str)
assert a.prop2 == "foo"
def test_under_cached_property_assignment(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
self._cache: dict[str, Any] = {}
@propcache_module.under_cached_property
def prop(self) -> None:
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
a.prop = 123 # type: ignore[assignment]
def test_under_cached_property_without_cache(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
"""Init."""
self._cache: dict[str, int] = {}
@propcache_module.under_cached_property
def prop(self) -> None:
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
a.prop = 123 # type: ignore[assignment]
def test_under_cached_property_check_without_cache(
propcache_module: APIProtocol,
) -> None:
class A:
def __init__(self) -> None:
"""Init."""
# Note that self._cache is intentionally missing
# here to verify AttributeError
@propcache_module.under_cached_property
def prop(self) -> None:
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
_ = a.prop # type: ignore[call-overload]
def test_under_cached_property_caching(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
self._cache: dict[str, int] = {}
@propcache_module.under_cached_property
def prop(self) -> int:
"""Docstring."""
return 1
a = A()
assert a.prop == 1
def test_under_cached_property_class_docstring(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
"""Init."""
@propcache_module.under_cached_property
def prop(self) -> None:
"""Docstring."""
if TYPE_CHECKING:
# At type checking, the fixture doesn't represent the real module, so
# we use the global-level imported module to verify the isinstance() check here
# matches the behaviour users would see in real code.
assert isinstance(A.prop, under_cached_property)
else:
assert isinstance(A.prop, propcache_module.under_cached_property)
assert "Docstring." == A.prop.__doc__
def test_ensured_wrapped_function_is_accessible(propcache_module: APIProtocol) -> None:
"""Test that the wrapped function can be accessed from python."""
class A:
def __init__(self) -> None:
"""Init."""
self._cache: dict[str, int] = {}
@propcache_module.under_cached_property
def prop(self) -> int:
"""Docstring."""
return 1
a = A()
assert A.prop.wrapped(a) == 1
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