'Fill up checks that do not generate any metadata'

def test_metadata_length(self):

    config = {'instances': [{'metadata': True}, {}, {'metadata': True}]}
    instances = config.get('instances')
    check = TestMetadata.FakeCheck('fake_check', config, {}, instances)
    check.run()
    service_metadata = check.get_service_metadata()
    service_metadata_count = len(service_metadata)
    self.assertEquals(service_metadata_count, 3)
    self.assertEquals(service_metadata[0], {'foo': 'bar'})
    self.assertEquals(service_metadata[1], {})
    self.assertEquals(service_metadata[2], {'foo': 'bar'})
