### Question:
WSCXMLServiceProvider implements ServiceProvider<String> { @Override public Set<String> listServices() { return Collections.unmodifiableSet(nameIndex.keySet()); } WSCXMLServiceProvider(InputStream serviceStream);  WSCXMLServiceProvider(File xmlServices); Service<String> getService(String serviceID); @Override Operation<String> getOperation(String operationID); @Override Iterable<Operation<String>> getOperationsWithInput(String inputInstance); @Override Iterable<Operation<String>> getOperationsWithOutput(String outputInstance); @Override Iterable<Operation<String>> getOperations(); @Override Iterable<Service<String>> getServices(); @Override Set<String> listOperations(); @Override Set<String> listServices(); static final String operationSuffix; }### Answer:
@Test public void testListServices() throws Exception { assertTrue(provider.listServices().contains("serv699915007")); assertTrue(provider.listServices().contains("serv1531463259")); assertTrue(provider.listServices().contains("serv76663416")); assertTrue(provider.listServices().contains("serv630482774")); assertTrue(provider.listServices().contains("serv2085282617")); assertFalse(provider.listServices().contains("serv699915007Operation")); assertFalse(provider.listServices().contains("serv1531463259Operation")); assertFalse(provider.listServices().contains("serv76663416Operation")); assertFalse(provider.listServices().contains("serv630482774Operation")); assertFalse(provider.listServices().contains("serv2085282617Operation")); }