@Test
public void testClassHierarchies() {
ServiceLocator provider = new ServiceLocator();
final Service service = new ChildTestService();
provider.addService(service);
assertThat(provider.getService(FooProvider.class), sameInstance(service));
final Service fancyCacheProvider = new FancyCacheProvider();
provider.addService(fancyCacheProvider);
final Collection<CacheProvider> servicesOfType =
provider.getServicesOfType(CacheProvider.class);
assertThat(servicesOfType, is(not(empty())));
assertThat(servicesOfType.iterator().next(), sameInstance(fancyCacheProvider));
}
