def load(self, requirements_file=None):
        """Load or reload requirements from a requirements.txt file.

        :param requirements_file: if not given, the filename used from
            initialization will be read again.
        """
        if requirements_file is None:
            requirements_file = self.filename
            if requirements_file is None:
                raise ValueError("no filename provided")
        elif isinstance(requirements_file, text_type):
            requirements_file = Path(requirements_file)
        self.clear()
        with requirements_file.open() as f:
            self.loads(f.read())

        if isinstance(requirements_file, (text_type, Path)):
            self.filename = requirements_file
def test_filter_factory(self):
        factory = memcache.filter_factory({'max_connections': '3'},
                                          memcache_servers='10.10.10.10:10',
                                          memcache_serialization_support='1')
        thefilter = factory('myapp')
        self.assertEqual(thefilter.app, 'myapp')
        self.assertEqual(thefilter.memcache_servers, '10.10.10.10:10')
        self.assertEqual(thefilter.memcache._allow_pickle, False)
        self.assertEqual(thefilter.memcache._allow_unpickle, True)
        self.assertEqual(
            thefilter.memcache._client_cache['10.10.10.10:10'].max_size, 3)