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

def it_cant_parse_nonsense(self, tmpdir):
        conffile = tmpdir.join('my.nonsense')
        conffile.write(example1.yaml)

        with ShouldRaise(
            C.UnrecognizedConfig(S(r'Unknown config type: .*/my\.nonsense'))
        ):
            example1.config.from_file(conffile.strpath)

result = dict(parser.items(self.projectname))
            for key, value in result.items():
                if key.endswith('_list'):
                    value = result.pop(key).split()
                    key = key.rsplit('_list', 1)[0]
                    result[key] = value
            return result
        elif filename.endswith(('.yaml', '.yml')):
            return yaml.load(
                io.open(filename),
                Loader=getattr(yaml, 'CSafeLoader', yaml.SafeLoader),
            )
        elif filename.endswith('.json'):
            return json.load(open(filename))
        else:
            raise UnrecognizedConfig('Unknown config type: %s' % filename)

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)