assertNotNull("Check cs availability - 2", ref_cs);
long begin = System.currentTimeMillis();
DelayedProvider dp = new DelayedProvider(provider, 200);
dp.start();
cs = (CheckService) context.getService(ref_cs);
assertTrue("Check invocation - 2", cs.check());
long end = System.currentTimeMillis();
assertTrue("Assert delay", (end - begin) >= 200);
ref_cs = Utils.getServiceReferenceByName(context, CheckService.class.getName(), un);