def test_code_msg_ceasar_chiper():
key = 'bcdefghijklmnopqrstuvwxyza'
coder = Coder(key)
ciphertext = 'cbobob'
plaintext = 'banana'
assert coder.crypt(plaintext) == ciphertext
def test_code_msg_one_letter_different():
key = 'abcdefghijklmnopq$stuvwxyz'
coder = Coder(key)
plaintext = 'door'
ciphertext = 'doo$'
assert coder.crypt(plaintext) == ciphertext
def test_code_msg_random_key():
key = '!)"(£*%&><@abcdefghijklmno'
coder = Coder(key)
plaintext = 'calendario'
ciphertext = '"!a£c(!g>d'
assert coder.crypt(plaintext) == ciphertext
def test_code_msg_no_changes():
key = 'abcdefghijklmnopqrstuvwxyz'
coder = Coder(key)
ciphertext = 'banana'
plaintext = 'banana'
assert coder.crypt(plaintext) == ciphertext
