Since Travi CI limits the size of standard output log up to 4MB, our Travis CI script prints out only selected lines of unit tests by using grep command. Although this manner limits the output log size, it makes error diagnosis very hard. So, we need to solve it.
One suggestion is to adjust the log level of log4j used for unit tests instead of grep commend. I expect that this manner will limit the log size as well as make error diagnosis easier.