Open the Check's source file by double click on it in a source tree as is shown:
Debug the Check by putting the breakpoint at controversial place (double-click)
on the left part of line number as it is shown:
Then right-click the corresponding Unit-test file or class definition > Debug As >
JUnit Test
Then manage you debug operations by F6 (Step Over), F5 (Step Into), F7 (Step Return)
and F8 (Resume)
