def cipher_string_test():
key = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(10))
lock = LockerCipher(key)
rand = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(2048))
enc = lock.encrypt(rand)
dec = lock.decrypt(enc)
assert enc != dec
assert dec == rand
