If one or more test methods in a JUnit test class fails, each one is displayed in the Test Output tab at the bottom of the window. This list of failures is similar to the list of compiler errors, in that a summary of the error is given in the tab, and clicking on it highlights the corresponding line in the file (as long as the "Highlight Source" checkbox is checked). Note that DrJava displays a warning message if the test class has been modified since the last time it was compiled, since the changes will not be reflected in the behavior of the test. Closing the Test Output tab resets the current set of JUnit failures.

Aborting Tests. If a suite of tests takes a long time or goes into an infinite loop, you can abort the tests by choosing the "Reset Interactions" command from the Tools menu. An error will be displayed in the Test Output tab showing that the tests were aborted.

Viewing the Stack Trace. When a JUnit test fails or throws an exception, it is sometimes helpful to view the entire stack trace when diagnosing the problem. To view the stack trace for any test failure, right click on the failure in the Test Output tab and select "Show Stack Trace."