Add method to jBPM JUnit support to retrieve active nodes

The JbpmUnitBaseTestCase class is nice because it provides some useful methods like:

public void assertProcessInstanceActive(ProcessName processName)

public void assertNodeActive(long processId, String nodeName)

etc… However, what would be nice is to have a method to get what process/node IS active. If you’re coding a junit test and asserting that the processes/nodes you EXPECT to be active, then if they’re NOT active, then .. .what IS active? Right now, there’s no way to easily determine that.