@pytest.mark.django_db
@pytest.mark.parametrize('title, error_message', (
    ('', 'You must provide movie title.'),
    ('Batman', '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)