def test_cipher_with_salt_equal_zero():
letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
assert letters == ''.join(make_cipher(0))
def test_cipher_length():
cipher = make_cipher(5)
assert 52 == len(cipher)
def test_cipher_with_salt_equal_100():
cipher = make_cipher(100)
assert cipher[0] == 'a'
def test_cipher_with_salt_equal_negative_100():
cipher = make_cipher(-100)
assert cipher[0] == 'a'
def test_cipher_with_salt_equal_negative_five():
letters = 'VWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTU'
assert letters == ''.join(make_cipher(-5))