File: test_interfaces.py

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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

import six

from cryptography.utils import InterfaceNotImplemented, verify_interface


class TestVerifyInterface(object):
    def test_verify_missing_method(self):
        @six.add_metaclass(abc.ABCMeta)
        class SimpleInterface(object):
            @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):
        @six.add_metaclass(abc.ABCMeta)
        class SimpleInterface(object):
            @abc.abstractmethod
            def method(self, a):
                """Method with one argument"""

        class NonImplementer(object):
            def method(self):
                """Method with no arguments"""

        with pytest.raises(InterfaceNotImplemented):
            verify_interface(SimpleInterface, NonImplementer)

    def test_handles_abstract_property(self):
        @six.add_metaclass(abc.ABCMeta)
        class SimpleInterface(object):
            @abc.abstractproperty
            def property(self):
                """An abstract property"""

        class NonImplementer(object):
            @property
            def property(self):
                """A concrete property"""

        verify_interface(SimpleInterface, NonImplementer)