def METHOD_NAME(mock_return, expected):
    gcp = GCP()
    with patch.object(gcp,
                      '_list_reservations_for_instance_type_in_zone',
                      return_value=mock_return):
        reservations = gcp.get_reservations_available_resources(
            'instance_type', 'region', 'zone',
            {'projects/<project>/reservations/<reservation>'})
        assert reservations == expected