vis.startTimeSup = 11000;
vis.lastLabel = null;
SampleResult res = SampleResult.createTestSample(19000, 20000);
res.setSampleLabel("test");
instance.sampleOccurred(new SampleEvent(res, "tg"));
assertNull(vis.lastLabel);
vis.lastLabel = null;
SampleResult res1 = SampleResult.createTestSample(21000, 22000);
res1.setSampleLabel("test1");