def METHOD_NAME(self):
    self._call_validate_array(
        'request_object_signing_alg_values_supported',
        ['none', 'RS256']
    )
    metadata = OpenIDProviderMetadata({
        'request_object_signing_alg_values_supported': ['RS512']
    })
    with self.assertRaises(ValueError) as cm:
        metadata.validate_request_object_signing_alg_values_supported()
    self.assertIn('SHOULD support none and RS256', str(cm.exception))