eger} (at char 0), (line:1, col:1)

            # too many '.'
            3.14.159
                ^
            FAIL: Expected end of text (at char 4), (line:1, col:5)

            Success

        Each test string must be on a single line. If you want to test a string that spans multiple
        lines, create a test like this::

            expr.run_tests(r"this is a test\n of strings that spans \n 3 lines")

        (Note that this is a raw string literal, you must include the leading ``'r'``.)
        r