### Question:
AuthenticationService { public boolean distributeInvalidate(String toInstanceId) { final Application application = discoveryClient.getApplication(CoreService.GATEWAY.getServiceId()); if (application == null) return false; final InstanceInfo instanceInfo = application.getByInstanceId(toInstanceId); if (instanceInfo == null) return false; final String url = EurekaUtils.getUrl(instanceInfo) + AuthController.CONTROLLER_PATH + "/invalidate/{}"; final Collection<String> invalidated = cacheUtils.getAllRecords(cacheManager, CACHE_INVALIDATED_JWT_TOKENS); for (final String invalidatedToken : invalidated) { restTemplate.delete(url, invalidatedToken); } return true; }  @PostConstruct void afterPropertiesSet(); String createJwtToken(String username, String domain, String ltpaToken); @CacheEvict(value = CACHE_VALIDATION_JWT_TOKEN, key = "#jwtToken") @Cacheable(value = CACHE_INVALIDATED_JWT_TOKENS, key = "#jwtToken", condition = "#jwtToken != null") Boolean invalidateJwtToken(String jwtToken, boolean distribute); @Cacheable(value = CACHE_INVALIDATED_JWT_TOKENS, unless = "true", key = "#jwtToken", condition = "#jwtToken != null") Boolean isInvalidated(String jwtToken); @Cacheable(value = CACHE_VALIDATION_JWT_TOKEN, key = "#jwtToken", condition = "#jwtToken != null") TokenAuthentication validateJwtToken(String jwtToken); @CachePut(value = "validationJwtToken", key = "#jwtToken", condition = "#jwtToken != null") TokenAuthentication createTokenAuthentication(String user, String jwtToken); boolean distributeInvalidate(String toInstanceId); TokenAuthentication validateJwtToken(TokenAuthentication token); QueryResponse parseJwtToken(String jwtToken); Optional<String> getJwtTokenFromRequest(HttpServletRequest request); String getLtpaTokenWithValidation(String jwtToken); String getLtpaToken(String jwtToken);  }### Answer:
@Test void testDistributeInvalidateNotFoundApplication() { when(discoveryClient.getApplication("gateway")).thenReturn(null); assertFalse(authService.distributeInvalidate("instanceId")); }
@Test void testDistributeInvalidateNotFoundInstance() { Application application = mock(Application.class); when(application.getByInstanceId("instanceId")).thenReturn(null); when(discoveryClient.getApplication("gateway")).thenReturn(application); assertFalse(authService.distributeInvalidate("instanceId")); }
@Test void testDistributeInvalidateSuccess() { reset(restTemplate); InstanceInfo instanceInfo = createInstanceInfo("instanceId", "host", 1000, 1433); Application application = mock(Application.class); when(application.getByInstanceId("instanceId")).thenReturn(instanceInfo); when(discoveryClient.getApplication("gateway")).thenReturn(application); ApplicationContext applicationContext = mock(ApplicationContext.class); CacheUtils cacheUtils = mock(CacheUtils.class); List<Object> elementsInCache = new ArrayList<>(); elementsInCache.add("a"); elementsInCache.add("b"); when(cacheUtils.getAllRecords(any(), any())).thenReturn(elementsInCache); AuthenticationService authenticationService = new AuthenticationService( applicationContext, authConfigurationProperties, jwtSecurityInitializer, getSpiedZosmfService(), discoveryClient, restTemplate, mock(CacheManager.class), cacheUtils ); when(applicationContext.getBean(AuthenticationService.class)).thenReturn(authenticationService); authenticationService.distributeInvalidate(instanceInfo.getInstanceId()); verify(restTemplate, times(2)).delete(anyString(), anyString()); verify(restTemplate, times(1)).delete(EurekaUtils.getUrl(instanceInfo) + "/gateway/auth/invalidate/{}", "a"); verify(restTemplate, times(1)).delete(EurekaUtils.getUrl(instanceInfo) + "/gateway/auth/invalidate/{}", "a"); }