def test_cipher_wrong_key(self):
with self.assertRaisesWithMessage(ValueError):
Cipher('a1cde')
with self.assertRaisesWithMessage(ValueError):
Cipher('aBcde')
def test_decode_string_with_default_shift_distance(self):
cipher = Cipher()
plaintext = 'xyzabcde'
ciphertext = 'wxyzabcd'
self.assertEqual(ciphertext, cipher.decode(plaintext))
def test_encode_with_26_shift_distance(self):
cipher = Cipher()
plaintext = 'abcdefghij'
ciphertext = 'abcdefghij'
self.assertEqual(ciphertext, cipher.encode(plaintext, 26))
def test_decode_raise_error_if_non_letter_characters(self):
cipher = Cipher()
plaintext = 'az4'
with pytest.raises(Exception):
cipher.decode(plaintext)
def test_encode_wraps_z_to_a(self):
cipher = Cipher()
plaintext = 'z'
ciphertext = 'a'
self.assertEqual(ciphertext, cipher.encode(plaintext))
def test_can_encode_messages_longer_than_the_key(self):
cipher = Cipher("abc")
plaintext = "iamapandabear"
self.assertEqual(cipher.encode(plaintext), "iboaqcnecbfcr")
def test_can_encode(self):
cipher = Cipher()
plaintext = "aaaaaaaaaa"
self.assertEqual(cipher.encode(plaintext),
cipher.key[0:len(plaintext)])
def test_cipher_encode_short_key(self):
c = Cipher('abcd')
self.assertEqual('abcdabcd', c.encode('aaaaaaaa'))
def test_decode_with_27_shift_distance(self):
cipher = Cipher()
plaintext = 'xyzabcde'
ciphertext = 'wxyzabcd'
self.assertEqual(ciphertext, cipher.decode(plaintext, 27))
def test_cipher_encode2(self):
c = Cipher('aaaaaaaaaaaaaaaaaaaaaa')
self.assertEqual('itisawesomeprogramminginpython',
c.encode('itisawesomeprogramminginpython'))
def test_cipher_encode3(self):
c = Cipher('dddddddddddddddddddddd')
self.assertEqual('yhqlylglylfl', c.encode('venividivici'))
def test_cipher_compositiion2(self):
plaintext = 'adaywithoutlaughterisadaywasted'
c = Cipher()
self.assertEqual(c.decode(c.encode(plaintext)), plaintext)
def test_cipher_compositiion1(self):
key = ('duxrceqyaimciuucnelkeoxjhdyduucpmrxmaivacmybmsdrzwqxvbxsy'
'gzsabdjmdjabeorttiwinfrpmpogvabiofqexnohrqu')
plaintext = 'adaywithoutlaughterisadaywasted'
c = Cipher(key)
self.assertEqual(c.decode(c.encode(plaintext)), plaintext)
def test_cipher_encode4(self):
key = ('duxrceqyaimciuucnelkeoxjhdyduucpmrxmaivacmybmsdrzwqxvbxsy'
'gzsabdjmdjabeorttiwinfrpmpogvabiofqexnohrqu')
c = Cipher(key)
self.assertEqual(c.encode('diffiehellman'), 'gccwkixcltycv')
def test_can_wrap_on_encode(self):
cipher = Cipher("abcdefghij")
plaintext = "zzzzzzzzzz"
self.assertEqual(cipher.encode(plaintext), "zabcdefghi")
def test_encode_always_returns_downcase_string(self):
cipher = Cipher()
plaintext = 'AbCdEfGhIj'
ciphertext = 'bcdefghijk'
self.assertEqual(ciphertext, cipher.encode(plaintext))
def test_can_wrap_on_decode(self):
cipher = Cipher("abcdefghij")
self.assertEqual(cipher.decode("zabcdefghi"), "zzzzzzzzzz")
def test_can_decode(self):
cipher = Cipher()
self.assertEqual(cipher.decode(cipher.key[0:len("aaaaaaaaaa")]),
"aaaaaaaaaa")
def test_can_decode_messages_longer_than_the_key(self):
cipher = Cipher("abc")
self.assertEqual(cipher.decode("iboaqcnecbfcr"), "iamapandabear")
def test_key_is_made_only_of_lowercase_letters(self):
self.assertIsNotNone(re.match("^[a-z]+$", Cipher().key))
def test_decode_always_returns_downcase_string(self):
cipher = Cipher()
plaintext = 'BcDeFgHiJk'
ciphertext = 'abcdefghij'
self.assertEqual(ciphertext, cipher.decode(plaintext))
def test_can_encode(self):
cipher = Cipher("abcdefghij")
plaintext = "aaaaaaaaaa"
self.assertEqual(cipher.encode(plaintext), cipher.key)
def test_decode_letter_with_default_shift_distance(self):
cipher = Cipher()
plaintext = 'b'
ciphertext = 'a'
self.assertEqual(ciphertext, cipher.decode(plaintext))
def test_can_decode(self):
cipher = Cipher("abcdefghij")
self.assertEqual(cipher.decode(cipher.key), "aaaaaaaaaa")
def test_decode_wraps_a_to_z(self):
cipher = Cipher()
plaintext = 'z'
ciphertext = 'a'
self.assertEqual(ciphertext, cipher.decode(plaintext))
def test_is_reversible(self):
cipher = Cipher("abcdefghij")
plaintext = "abcdefghij"
self.assertEqual(cipher.decode(cipher.encode(plaintext)), plaintext)
def test_decode_with_10_shift_distance(self):
cipher = Cipher()
plaintext = 'ghijklmn'
ciphertext = 'wxyzabcd'
self.assertEqual(ciphertext, cipher.decode(plaintext, 10))
def test_can_double_shift_encode(self):
cipher = Cipher("iamapandabear")
plaintext = "iamapandabear"
self.assertEqual(cipher.encode(plaintext), "qayaeaagaciai")
def test_decode_with_26_shift_distance(self):
cipher = Cipher()
plaintext = 'klmnopqrst'
ciphertext = 'klmnopqrst'
self.assertEqual(ciphertext, cipher.decode(plaintext, 26))
def test_throws_an_error_with_empty_key(self):
with self.assertRaisesWithMessage(ValueError):
Cipher('')
