// Open new window to cause the current window to loose focus
page.getWorkbenchWindow().getWorkbench().openWorkbenchWindow(null);
long postEnd = System.currentTimeMillis();
assertEquals(1, tracker.getData().size());
PerspectiveEvent e = tracker.getData().iterator().next();
assertEquals(page.getPerspective(), e.getPerspective());
long start = e.getInterval().getStartMillis();
long end = e.getInterval().getEndMillis();
checkTime(preStart, start, postStart, preEnd, end, postEnd);
}