Time is passing over midnight. Running to the final stage, I think that the testing environment is the most important when developing crucial software. Yes. Unit testing is important. But the final system testing is important and we need automated testing environment. In other words, it should be considered at the initial stage and set up. So, every day atomated testing should be running. My mistake was that. Although I had automated testing environment, its verification feature is insufficient. Espetially sorting and deleting calcuation was not operated. I have learned not crashing is more important than any otherfeature operation. I know. Testing environment is very boring job and may need much time. But it should be set up at the initial step.