def configure_data_mapper_registry():
    logger.debug("Configuring data mapper registry")

    DataMapperRegistry.register(AvailableWordsForSource,
                                AvailableWordsForSourceMongoDbDataMapper())
    DataMapperRegistry.register(UrlPair, UrlPairMongoDbDataMapper())
    DataMapperRegistry.register(User, UserMongoDbDataMapper())
    def setUp(self):
        self.url_pair_data_mapper = UrlPairInMemoryDataMapper()
        self.user_data_mapper = UserInMemoryDataMapper()
        self.available_words_for_source_data_mapper = (
            AvailableWordsForSourceInMemoryDataMapper())

        DataMapperRegistry.register(UrlPair, self.url_pair_data_mapper)
        DataMapperRegistry.register(User, self.user_data_mapper)
        DataMapperRegistry.register(
            AvailableWordsForSource,
            self.available_words_for_source_data_mapper)