'Ensure that all keys are present and missing speeds map to the
empty string.'

def test_parse_youtube_one_video(self):

    youtube_str = '0.75:jNCf2gIqpeE'
    output = VideoDescriptor._parse_youtube(youtube_str)
    self.assertEqual(output, {'0.75': 'jNCf2gIqpeE', '1.00': '', '1.25': '', '1.50': ''})
