def test_listIdentifiers_from_none(self):
        # test listIdentifiers with until argument as None explicitly

        # XXX unfortunately a white box test relying on particular
        # exception behavior of the fake server. We do verify whether
        # from or from_ doesn't appear in the request args though
        try:
            headers = fakeclient.listIdentifiers(from_=None,
                                                 metadataPrefix='oai_dc')
        except __HOLE__, e:
            self.assertEquals('metadataPrefix=oai_dc&verb=ListIdentifiers',
                              e.args[0])
dataset/ETHPy150Open infrae/pyoai/src/oaipmh/tests/test_client.py/ClientTestCase.test_listIdentifiers_from_none