def test_defines_metadata_tags():
assert_that(
tuple(Album.tags()),
contains_inanyorder("release_name", "compilation", "lead_performer",
"lead_performer_region", "guest_performers",
"label_name", "upc", "catalog_number",
"release_time", "original_release_time",
"lead_performer_date_of_birth", "contributors",
"isnis", "ipis"))
def test_has_initially_no_metadata_or_images():
album = Album()
for tag in Album.tags():
assert_that(getattr(album, tag), none(), tag)
assert_that(album.images, empty(), "images")