assertTrue(":b:", listenerCalled == false);
public void test_addShellListenerLorg_eclipse_swt_events_ShellListener() {	listenerCalled = false;	boolean exceptionThrown = false;	ShellListener listener = new ShellAdapter() {		public void shellActivated(ShellEvent e) {			listenerCalled = true;		}	};	try {		shell.addShellListener(null);	}	catch (IllegalArgumentException e) {		exceptionThrown = true;	}	shell.addShellListener(listener);	shell.forceActive();	assertTrue(":a:", listenerCalled == true);		listenerCalled = false;	shell.removeShellListener(listener);	shell.forceActive();	assertTrue(":b:", listenerCalled == false);	try {		shell.removeShellListener(null);	}	catch (IllegalArgumentException e) {		exceptionThrown = true;	}}