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import platform
import pytest
from yarl import _helpers, _helpers_py
IS_PYPY = platform.python_implementation() == "PyPy"
class CachedPropertyMixin:
cached_property = NotImplemented
def test_cached_property(self) -> None:
class A:
def __init__(self):
self._cache = {}
@self.cached_property # type: ignore[misc]
def prop(self):
return 1
a = A()
assert a.prop == 1
def test_cached_property_class(self) -> None:
class A:
def __init__(self):
"""Init."""
# self._cache not set because its never accessed in this test
@self.cached_property # type: ignore[misc]
def prop(self):
"""Docstring."""
assert isinstance(A.prop, self.cached_property)
assert A.prop.__doc__ == "Docstring."
def test_cached_property_assignment(self) -> None:
class A:
def __init__(self):
self._cache = {}
@self.cached_property # type: ignore[misc]
def prop(self):
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
a.prop = 123
def test_cached_property_without_cache(self) -> None:
class A:
def __init__(self):
pass
@self.cached_property # type: ignore[misc]
def prop(self):
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
a.prop = 123
def test_cached_property_check_without_cache(self) -> None:
class A:
def __init__(self):
pass
@self.cached_property # type: ignore[misc]
def prop(self):
"""Mock property."""
a = A()
with pytest.raises(AttributeError):
assert a.prop == 1
class TestPyCachedProperty(CachedPropertyMixin):
cached_property = _helpers_py.cached_property # type: ignore[assignment]
if (
not _helpers.NO_EXTENSIONS
and not IS_PYPY
and hasattr(_helpers, "cached_property_c")
):
class TestCCachedProperty(CachedPropertyMixin):
cached_property = _helpers.cached_property_c # type: ignore[assignment, attr-defined, unused-ignore] # noqa: E501
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