def test_is_empty_when_cleared():
metadata = Metadata()
metadata["artist"] = "John Doe"
metadata.addImage("img/jpeg", "...")
metadata.clear()
assert_that(metadata.empty(), is_(True), "emptiness")
def test_is_not_empty_when_containing_images():
metadata = Metadata()
metadata.addImage("img/jpeg", "...")
assert_that(metadata.empty(), is_(False), "emptiness")
def test_is_not_empty_when_holding_tags():
metadata = Metadata()
metadata["artist"] = "John Doe"
metadata.addImage("img/jpeg", "...")
assert_that(metadata.empty(), is_(False), "emptiness")
def test_is_initially_empty():
metadata = Metadata()
assert_that(metadata, empty(), "tags")
assert_that(list(metadata.images), empty(), "images")
assert_that(metadata.empty(), is_(True), "emptiness")