When the only change between two files is a COMMENT_MOVE, changedistiller can't detect that change.
Comment Move is only detected when there is another change beside it.
For this particular test, the extra change is deleting the "System.out.println("right");" statement in line 30.
When the only change between two files is a COMMENT_MOVE, changedistiller can't detect that change. Comment Move is only detected when there is another change beside it. For this particular test, the extra change is deleting the "System.out.println("right");" statement in line 30.