def assertEndsWith(self, s, suffix):
        """
        Assert that C{s} end with a particular C{suffix}.

        @param s: The input string.
        @type s: C{str}
        @param suffix: The string that C{s} should end with.
        @type suffix: C{str}
        """
        self.assertTrue(s.endswith(suffix),
                        '%r is not the end of %r' % (suffix, s))

        Assert that C{s} end with a particular C{suffix}.

        @param s: The input string.
        @type s: C{str}
        @param suffix: The string that C{s} should end with.
        @type suffix: C{str}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_failure.py