def test_insert(self):
storage = Storage(a=1, b=2)
assert storage.a == 1
assert storage.b == 2
def test_keys(self):
storage = Storage(a=1, b=2)
key = storage.keys()
key = list(key)
assert key[0] == 'a' or 'b'
assert key[1] == 'b' or 'a'