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import sys
from collections.abc import Callable
from operator import not_
from typing import TYPE_CHECKING, Any, Protocol, TypeVar
import pytest
from propcache.api import cached_property
if sys.version_info >= (3, 11):
from typing import assert_type
_T_co = TypeVar("_T_co", covariant=True)
class APIProtocol(Protocol):
def cached_property(
self, func: Callable[[Any], _T_co]
) -> cached_property[_T_co]: ...
def test_cached_property(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
"""Init."""
@propcache_module.cached_property
def prop(self) -> int:
return 1
a = A()
if sys.version_info >= (3, 11):
assert_type(a.prop, int)
assert a.prop == 1
def test_cached_property_without_cache(propcache_module: APIProtocol) -> None:
class A:
__slots__ = ()
def __init__(self) -> None:
pass
@propcache_module.cached_property
def prop(self) -> None:
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
a.prop = 123 # type: ignore[assignment]
def test_cached_property_check_without_cache(propcache_module: APIProtocol) -> None:
class A:
__slots__ = ()
def __init__(self) -> None:
"""Init."""
@propcache_module.cached_property
def prop(self) -> None:
"""Mock property."""
a = A()
with pytest.raises((TypeError, AttributeError)):
assert a.prop == 1
def test_cached_property_caching(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
"""Init."""
@propcache_module.cached_property
def prop(self) -> int:
"""Docstring."""
return 1
a = A()
assert a.prop == 1
def test_cached_property_class_docstring(propcache_module: APIProtocol) -> None:
class A:
def __init__(self) -> None:
"""Init."""
@propcache_module.cached_property
def prop(self) -> None:
"""Docstring."""
if TYPE_CHECKING:
assert isinstance(A.prop, cached_property)
else:
assert isinstance(A.prop, propcache_module.cached_property)
assert "Docstring." == A.prop.__doc__
def test_set_name(propcache_module: APIProtocol) -> None:
"""Test that the __set_name__ method is called and checked."""
class A:
@propcache_module.cached_property
def prop(self) -> None:
"""Docstring."""
A.prop.__set_name__(A, "prop")
match = r"Cannot assign the same cached_property to two "
with pytest.raises(TypeError, match=match):
A.prop.__set_name__(A, "something_else")
def test_get_without_set_name(propcache_module: APIProtocol) -> None:
"""Test that get without __set_name__ fails."""
cp = propcache_module.cached_property(not_)
class A:
"""A class."""
A.cp = cp # type: ignore[attr-defined]
match = r"Cannot use cached_property instance "
with pytest.raises(TypeError, match=match):
_ = A().cp # type: ignore[attr-defined]
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."""
@propcache_module.cached_property
def prop(self) -> int:
"""Docstring."""
return 1
a = A()
assert A.prop.func(a) == 1
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