How to use the pgctl.config.AmbiguousConfig function in pgctl

def it_explodes_on_ambiguity(self, tmpdir):
        conffile = tmpdir.join('example1.ini')
        conffile.write(example1.ini)
        conffile = tmpdir.join('example1.conf')
        conffile.write(example1.ini)
        with ShouldRaise(
            C.AmbiguousConfig(
                S(r'multiple configurations found at .*/example1\.\*'))
        ):
            example1.config.from_path_prefix(tmpdir.strpath + '/')

def from_glob(self, pattern):
        from pgctl.configsearch import glob
        results = []
        for fname in glob(pattern):
            try:
                config = self.from_file(fname)
            except UnrecognizedConfig:
                continue
            else:
                results.append(config)

        if len(results) == 1:
            return results[0]
        elif len(results) > 1:
            raise AmbiguousConfig('multiple configurations found at %s' % pattern)