@pytest.mark.django_db
@pytest.mark.parametrize('title', ['',
                                   'Batman'],
                         'error_message', ['You must provide movie title.',
                                           'Movie with this title already exists in database.'])
def test_movie_validate_title_missing(title, error_message):
    serializer = MovieBaseSerializer()
    with pytest.raises(ValidationError) as exc:
        serializer.validate_title(title)

        assert str(ValidationError(error_message)) == str(exc.value)