def test_can_append_after_removing(self):
index = PriorityIndex(["alice", "bob", "carol"])
index.remove("bob")
index.append("dave")
assert_feature_priorities(index, "alice", "carol", "dave")
def test_can_remove_last_feature(self):
index = PriorityIndex(["alice", "bob", "carol", "dave"])
index.remove("dave")
assert_feature_priorities(index, "alice", "bob", "carol")