assertNotNull("Check foo availability", ref_fs);
ServiceReference ref_cs = ipojoHelper.getServiceReferenceByName(CheckService.class.getName(), un);
assertNotNull("Check cs availability", ref_cs);
CheckService cs = (CheckService) osgiHelper.getServiceObject(ref_cs);
assertTrue("Check invocation", cs.check());
// Stop the provider.
provider2.stop();
ref_cs = ipojoHelper.getServiceReferenceByName(CheckService.class.getName(), un);
assertNotNull("Check cs availability - 2", ref_cs);
long begin = System.currentTimeMillis();
DelayedProvider dp2 = new DelayedProvider(provider2, 100);
dp2.start();
cs = (CheckService) osgiHelper.getServiceObject(ref_cs);
assertTrue("Check invocation - 2", cs.check());
long end = System.currentTimeMillis();
System.out.println("delay = " + (end - begin));
assertTrue("Assert min delay", (end - begin) >= 100);
assertTrue("Assert max delay", (end - begin) <= 1000);
dp2.stop();
ref_cs = ipojoHelper.getServiceReferenceByName(CheckService.class.getName(), un);
assertNotNull("Check cs availability - 3", ref_cs);
cs = (CheckService) osgiHelper.getServiceObject(ref_cs);
assertTrue("Check invocation - 3", cs.check());
provider1.stop();
provider2.stop();
provider1.dispose();
provider2.dispose();