def test_2(self):
result = encrypt("This is a test!", 1)
self.assertEqual(result, "hsi etTi sats!")
def test_1(self):
result = encrypt("This is a test!", 0)
self.assertEqual(result, "This is a test!")
def test_31(self):
result = encrypt("", 0)
self.assertEqual(result, "")
def test_32(self):
result = encrypt(None, 0)
self.assertEqual(result, None)
def test_3(self):
result = encrypt("This is a test!", 2)
self.assertEqual(result, "s eT ashi tist!")