def test_known_result(self):
"""
disemvowel will fail return if its return value doesn't match a
known output with a given input string.
"""
result = main.disemvowel("foobar")
self.assertEqual(result, "fbr")
def test_return_type_is_str(self):
"""
disemvowel will fail if the return type is not a string.
"""
result = main.disemvowel("foobar")
self.assertIsInstance(result, str)