Bug 65839 [JUnit] update job leaks
There are situations when the JUnit update jobs are not properly stopped. Need to add safety checks to make sure that the update job is stopped.
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/ui/TestRunnerViewPart.java
for (Enumeration e= fTestRunTabs.elements(); e.hasMoreElements();) {
						TestRunTab v= (TestRunTab) e.nextElement();
						v.aboutToStart();
					}
					fNextAction.setEnabled(false);
					fPreviousAction.setEnabled(false);
				}
			}
		});
	}
	
	private void postEndTest(final String testId, final String testName) {
		postSyncRunnable(new Runnable() {
			public void run() {
				if(isDisposed()) 
					return;
				handleEndTest();
				for (Enumeration e= fTestRunTabs.elements(); e.hasMoreElements();) {
					TestRunTab v= (TestRunTab) e.nextElement();
					v.endTest(testId);
				}
				
				if (fFailureCount + fErrorCount > 0) {
					fNextAction.setEnabled(true);
					fPreviousAction.setEnabled(true);
				}
			}
		});	
	}
	private void postStartTest(final String testId, final String testName) {