JsonTest trait no longer needed. Improve test coverage of CommonMethodValiations.
JsonTest trait no longer needed. Improve test coverage of CommonMethodValiations.

RB_ID=630774

tom-chan/finatra,deanh/finatra,yonglehou/finatra,twitter/finatra,jaume-pinyol/finatra,tempbottle/finatra,andrerigon/finatra,tom-chan/finatra,tempbottle/finatra,syamantm/finatra,syamantm/finatra,kaushik94/finatra,twitter/finatra,andrerigon/finatra,nkhuyu/finatra,tom-chan/finatra,deanh/finatra,syamantm/finatra,tempbottle/finatra,deanh/finatra,joecwu/finatra,tom-chan/finatra,joecwu/finatra,tempbottle/finatra,yonglehou/finatra,syamantm/finatra,joecwu/finatra,yonglehou/finatra,nkhuyu/finatra,andrerigon/finatra,kaushik94/finatra,yonglehou/finatra,jaume-pinyol/finatra,nkhuyu/finatra,joecwu/finatra,kaushik94/finatra,jaume-pinyol/finatra,kaushik94/finatra,nkhuyu/finatra,andrerigon/finatra,jaume-pinyol/finatra,twitter/finatra,deanh/finatra