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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 abc
import pytest
from cryptography.utils import (
InterfaceNotImplemented,
register_interface_if,
verify_interface,
)
def test_register_interface_if_true():
class SimpleInterface(metaclass=abc.ABCMeta):
pass
@register_interface_if(1 == 1, SimpleInterface)
class SimpleClass(object):
pass
assert issubclass(SimpleClass, SimpleInterface) is True
def test_register_interface_if_false():
class SimpleInterface(metaclass=abc.ABCMeta):
pass
@register_interface_if(1 == 2, SimpleInterface)
class SimpleClass(object):
pass
assert issubclass(SimpleClass, SimpleInterface) is False
class TestVerifyInterface(object):
def test_verify_missing_method(self):
class SimpleInterface(metaclass=abc.ABCMeta):
@abc.abstractmethod
def method(self):
"""A simple method"""
class NonImplementer(object):
pass
with pytest.raises(InterfaceNotImplemented):
verify_interface(SimpleInterface, NonImplementer)
def test_different_arguments(self):
class SimpleInterface(metaclass=abc.ABCMeta):
@abc.abstractmethod
def method(self, a):
"""Method with one argument"""
class NonImplementer(object):
def method(self):
"""Method with no arguments"""
# Invoke this to ensure the line is covered
NonImplementer().method()
with pytest.raises(InterfaceNotImplemented):
verify_interface(SimpleInterface, NonImplementer)
def test_handles_abstract_property(self):
class SimpleInterface(metaclass=abc.ABCMeta):
@abc.abstractproperty
def property(self):
"""An abstract property"""
class NonImplementer(object):
@property
def property(self):
"""A concrete property"""
# Invoke this to ensure the line is covered
NonImplementer().property
verify_interface(SimpleInterface, NonImplementer)
def test_signature_mismatch(self):
class SimpleInterface(metaclass=abc.ABCMeta):
@abc.abstractmethod
def method(self, other: object) -> int:
"""Method with signature"""
class ClassWithoutSignature:
def method(self, other):
"""Method without signature"""
class ClassWithSignature:
def method(self, other: object) -> int:
"""Method with signature"""
verify_interface(SimpleInterface, ClassWithoutSignature)
verify_interface(SimpleInterface, ClassWithSignature)
with pytest.raises(InterfaceNotImplemented):
verify_interface(
SimpleInterface, ClassWithoutSignature, check_annotations=True
)
verify_interface(
SimpleInterface, ClassWithSignature, check_annotations=True
)
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