def test_one_character(self):
h, t = Trie.parse_key('a')
assert h == 'a'
assert t == ''
def test_accepts_strings_only(self):
try:
h, t = Trie.parse_key(5)
assert False, 'Expected error for non-string key'
except TypeError:
pass
def test_empty_string(self):
h, t = Trie.parse_key('')
assert h == ''
assert t == ''
