How to use the mediafile.ImageType.composer function in mediafile

def test_add_tiff_image(self):
        mediafile = self._mediafile_fixture('image')
        self.assertEqual(len(mediafile.images), 2)

        image = Image(data=self.tiff_data, desc=u'the composer',
                      type=ImageType.composer)
        mediafile.images += [image]
        mediafile.save()

        mediafile = MediaFile(mediafile.path)
        self.assertEqual(len(mediafile.images), 3)

        # WMA does not preserve the order, so we have to work around this
        image = list(filter(lambda i: i.mime_type == 'image/tiff',
                     mediafile.images))[0]
        self.assertExtendedImageAttributes(
            image, desc=u'the composer', type=ImageType.composer)

mediafile = self._mediafile_fixture('image')
        self.assertEqual(len(mediafile.images), 2)

        image = Image(data=self.tiff_data, desc=u'the composer',
                      type=ImageType.composer)
        mediafile.images += [image]
        mediafile.save()

        mediafile = MediaFile(mediafile.path)
        self.assertEqual(len(mediafile.images), 3)

        # WMA does not preserve the order, so we have to work around this
        image = list(filter(lambda i: i.mime_type == 'image/tiff',
                     mediafile.images))[0]
        self.assertExtendedImageAttributes(
            image, desc=u'the composer', type=ImageType.composer)

def test_add_image_structure(self):
        mediafile = self._mediafile_fixture('image')
        self.assertEqual(len(mediafile.images), 2)

        image = Image(data=self.png_data, desc=u'the composer',
                      type=ImageType.composer)
        mediafile.images += [image]
        mediafile.save()

        mediafile = MediaFile(mediafile.path)
        self.assertEqual(len(mediafile.images), 3)

        images = (i for i in mediafile.images if i.desc == u'the composer')
        image = next(images, None)
        self.assertExtendedImageAttributes(
            image, desc=u'the composer', type=ImageType.composer
        )

def test_add_image_structure(self):
        mediafile = self._mediafile_fixture('image')
        self.assertEqual(len(mediafile.images), 2)

        image = Image(data=self.png_data, desc=u'the composer',
                      type=ImageType.composer)
        mediafile.images += [image]
        mediafile.save()

        mediafile = MediaFile(mediafile.path)
        self.assertEqual(len(mediafile.images), 3)

        images = (i for i in mediafile.images if i.desc == u'the composer')
        image = next(images, None)
        self.assertExtendedImageAttributes(
            image, desc=u'the composer', type=ImageType.composer
        )

"""
    formats = ['APEv2File', 'WavPack', 'Musepack', 'MonkeysAudio', 'OptimFROG']

    TAG_NAMES = {
        ImageType.other: 'Cover Art (other)',
        ImageType.icon: 'Cover Art (icon)',
        ImageType.other_icon: 'Cover Art (other icon)',
        ImageType.front: 'Cover Art (front)',
        ImageType.back: 'Cover Art (back)',
        ImageType.leaflet: 'Cover Art (leaflet)',
        ImageType.media: 'Cover Art (media)',
        ImageType.lead_artist: 'Cover Art (lead)',
        ImageType.artist: 'Cover Art (artist)',
        ImageType.conductor: 'Cover Art (conductor)',
        ImageType.group: 'Cover Art (band)',
        ImageType.composer: 'Cover Art (composer)',
        ImageType.lyricist: 'Cover Art (lyricist)',
        ImageType.recording_location: 'Cover Art (studio)',
        ImageType.recording_session: 'Cover Art (recording)',
        ImageType.performance: 'Cover Art (performance)',
        ImageType.screen_capture: 'Cover Art (movie scene)',
        ImageType.fish: 'Cover Art (colored fish)',
        ImageType.illustration: 'Cover Art (illustration)',
        ImageType.artist_logo: 'Cover Art (band logo)',
        ImageType.publisher_logo: 'Cover Art (publisher logo)',
    }

    def __init__(self):
        super(APEv2ImageStorageStyle, self).__init__(key='')

    def fetch(self, mutagen_file):
        images = []