@Override
  public QuotaRecommendation charge(RestRequest restRequest, Map<QuotaName, Double> requestCostMap) {
    return null;
  }
Constructor for {@link RejectRequestQuotaEnforcer}.
@param quotaSource {@link QuotaSource} object.
ambry-test-utils/src/main/java/com/github/ambry/quota/RejectRequestQuotaEnforcer.java