def test_key_is_valid(self):
valid_keys = [-100, 100, 0]
invalid_keys = [{'a': 'b', 'b': 'c'}, 'aeiou', []]
cipher = substitution.CaesarCipher()
for key in valid_keys:
assert cipher.key_is_valid(key)
for key in invalid_keys:
assert not cipher.key_is_valid(key)
def test_no_shift(self):
cipher = substitution.CaesarCipher()
plaintext = FOX_TEXT
ciphertext = cipher.encrypt(plaintext, 0)
assert plaintext == ciphertext
def test_random_key(self):
cipher = substitution.CaesarCipher()
for i in range(100):
key = substitution.get_random_caesar_key()
assert cipher.key_is_valid(key)
def test_decrypt_neg_25(self):
cipher = substitution.CaesarCipher()
ciphertext = SHIFT_1
plaintext = cipher.decrypt(ciphertext, -25)
assert plaintext == FOX_TEXT
def test_shift_raises_exception_with_invalid_key(self):
cipher = substitution.CaesarCipher()
with pytest.raises(exceptions.InvalidKeyException):
cipher.encrypt('abc', {'a': 'b', 'b': 'c'})
def test_shift_back_27(self):
cipher = substitution.CaesarCipher()
plaintext = FOX_TEXT
ciphertext = cipher.encrypt(plaintext, -27)
assert ciphertext == SHIFT_25
def test_shift_26(self):
cipher = substitution.CaesarCipher()
plaintext = FOX_TEXT
ciphertext = cipher.encrypt(plaintext, 26)
assert ciphertext == plaintext
