我正在使用 dropwizard 構建應用程序。我做了一個過濾器來攔截和記錄調用服務的相關 ID。如果傳入請求的標頭中沒有標頭“Correlation-Id”，我們將在響應中附加一個標頭。以下是過濾器：public class CorrelationIdServletFilter implements Filter {private static final Logger LOGGER =  LoggerFactory.getLogger(CorrelationIdServletFilter.class); private static final String CORRELATION_ID_HEADER_NAME = "Correlation-ID"; private static final String CORRELATION_ID_MDC_KEY = " "; private static final InheritableThreadLocal<String> correlationId =  new InheritableThreadLocal<>();  public static String getCorrelationId() {return correlationId.get(); } @Override public void init(FilterConfig filterConfig) throws ServletException {} @Override  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)  throws IOException, ServletException {try {  HttpServletRequest req = (HttpServletRequest) request;  HttpServletResponse res = (HttpServletResponse) response;  String correlationIdHeaderValue = req.getHeader(CORRELATION_ID_HEADER_NAME);  LOGGER.debug      (      "HTTP Header("          + CORRELATION_ID_HEADER_NAME          + ") = ["          + correlationIdHeaderValue          + "] will generate a new correlationId if incoming is NULL");  String correlationIdRaw;  if (!StringUtils.isEmpty(correlationIdHeaderValue)) {    correlationIdRaw = correlationIdHeaderValue;  } else {    correlationIdRaw = UUID.randomUUID().toString();  }  LOGGER.debug("Request: (" + req.getRequestURI() + ") is marked as :" + correlationIdRaw);  correlationId.set(correlationIdRaw);  MDC.put(CORRELATION_ID_MDC_KEY, getCorrelationId());  res.addHeader(CORRELATION_ID_HEADER_NAME, correlationIdRaw);  LOGGER.debug(      "Response holds correlationId : ("          + res.getHeader("Correlation-ID")          + ") in its header ");  chain.doFilter(req, res);} finally {  correlationId.remove();  MDC.remove(CORRELATION_ID_MDC_KEY);}}  @Override  public void destroy() {}}我需要編寫單元測試來涵蓋兩種情況：發送請求時沒有關聯 ID。檢查在服務器端生成的 id。當發送帶有相關 ID 的響應時。檢查它是否與響應一起發回。誰能指出我如何做到這一點？