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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
import typing
import pytest
from cryptography import utils
class TestCachedProperty(object):
def test_simple(self):
class T(object):
@utils.cached_property
def t(self):
accesses.append(None)
return 14
accesses: typing.List[typing.Optional[T]] = []
assert T.t
t = T()
assert t.t == 14
assert len(accesses) == 1
assert t.t == 14
assert len(accesses) == 1
t = T()
assert t.t == 14
assert len(accesses) == 2
assert t.t == 14
assert len(accesses) == 2
def test_set(self):
class T(object):
@utils.cached_property
def t(self):
accesses.append(None)
return 14
accesses: typing.List[typing.Optional[T]] = []
t = T()
with pytest.raises(AttributeError):
t.t = None
assert len(accesses) == 0
assert t.t == 14
assert len(accesses) == 1
with pytest.raises(AttributeError):
t.t = None
assert len(accesses) == 1
assert t.t == 14
assert len(accesses) == 1
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