private JSONObject buildTestQuotaEnforcerSourceInfoPairJson() {
    JSONObject jsonObject = new JSONObject();
    jsonObject.put(QuotaConfig.ENFORCER_STR, "com.github.ambry.quota.TestCUQuotaEnforcerFactory");
    jsonObject.put(QuotaConfig.SOURCE_STR, "com.github.ambry.quota.capacityunit.AmbryCUQuotaSourceFactory");
    JSONArray jsonArray = new JSONArray();
    jsonArray.put(jsonObject);
    jsonObject = new JSONObject();
    jsonObject.put(QuotaConfig.ENFORCER_STR, "com.github.ambry.quota.TestCUQuotaEnforcerFactory");
    jsonObject.put(QuotaConfig.SOURCE_STR, "com.github.ambry.quota.capacityunit.AmbryCUQuotaSourceFactory");
    jsonArray.put(jsonObject);
    return new JSONObject().put(QuotaConfig.QUOTA_ENFORCER_SOURCE_PAIR_INFO_STR, jsonArray);
  }
Build the test quota enforcer and source pair json.
@return JSONObject representing the pair json.
ambry-quota/src/test/java/com/github/ambry/quota/AmbryQuotaManagerTest.java