def test_disable(self):
        strategies = {'Foo': mock.Mock(return_value=lambda z: z)}
        feature_def = {
            'enabled': False,
            'strategies': [{'name': 'Foo', 'parameters': {'x': 0}}],
        }

        toggle = features.Feature(strategies, feature_def)

        assert not toggle({'z': True})
        assert not toggle({'z': False})
        assert toggle.choices == {True: 0, False: 2}
    def test_empty_strategy_list(self):
        strategies = {'Foo': mock.Mock(return_value=lambda z: z)}
        feature_def = {
            'enabled': True,
            'strategies': [],
        }

        toggle = features.Feature(strategies, feature_def)

        assert isinstance(toggle, features.Feature)
        assert not toggle({'z': True})
        assert not toggle({'z': False})
        assert toggle.choices == {True: 0, False: 2}