def test_key_does_not_exist(self):
trie = Trie()
with pytest.raises(KeyNotFound):
trie.values('foobar')
def test_key_exists(self):
trie = Trie()
trie.add('foobar', 1)
trie.add('foobar', 2)
assert trie.values('foobar') == [1, 2]
