def METHOD_NAME(self):
    self.assertEqual(
        format_exception(
            "This is a very, very, very long message that will "
            "inevitably wrap onto another line.",
            prolog="Hello world:",
        ),
        "Hello world:\n"
        "    This is a very, very, very long message that will inevitably "
        "wrap onto\n"
        "    another line.",
    )