private function fetchValidQuestionAmountConfigModeWithFallbackModePerTest(ilTestRandomQuestionSetConfig $config)
 {
     switch ($config->getQuestionAmountConfigurationMode()) {
         case ilTestRandomQuestionSetConfig::QUESTION_AMOUNT_CONFIG_MODE_PER_TEST:
         case ilTestRandomQuestionSetConfig::QUESTION_AMOUNT_CONFIG_MODE_PER_POOL:
             return $config->getQuestionAmountConfigurationMode();
     }
     return ilTestRandomQuestionSetConfig::QUESTION_AMOUNT_CONFIG_MODE_PER_TEST;
 }