long preEnd = System.currentTimeMillis();
page.closeAllPerspectives(false, false);
long postEnd = System.currentTimeMillis();
assertEquals(1, tracker.getData().size());
PerspectiveEvent e = tracker.getData().iterator().next();
assertEquals(perspective, e.getPerspective());
long start = e.getInterval().getStartMillis();
long end = e.getInterval().getEndMillis();
checkTime(preStart, start, postStart, preEnd, end, postEnd);
}