Major Description
Test cases are difficult to debug if they fail.
This is because many test cases catch Exception, and don't report it fully.
Test cases should only catch a (specific) Exception if the test is expected to generate one, and should otherwise throw the Exception.
Several test cases report problems to System.out or System.err and carry on processing.
For example, serialisation errors are largely ignored, and SCXMLTestHelper#testExecutorSerializability() ignores IO errors.
Testing generates a lot of output, some of which appears to be errors (e.g. stack traces) yet the test passes.
Ideally tests should suppress output stack traces which are expected during testing.