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相关Id的单元测试过滤器

dropwizard servlet-filters correlation servlets java

hal9000 · 技术社区 · 6 年前

我做了一个过滤器来截取并记录调用服务的相关ID。

以下是筛选器:

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() {}
}

我需要编写单元测试来涵盖两种情况:

如果发送的请求没有相关Id,请检查服务器端是否生成了Id。

有人能告诉我怎么做吗?

我试着用mock,但我不知道响应在标题中没有任何内容。

@Test
  public void testResponse_for_RequestWithoutCcid() throws IOException, ServletException {

HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);
HttpServletResponse httpServletResponse = mock(HttpServletResponse.class);
FilterChain filterChain = mock(FilterChain.class);
CorrelationIdServletFilter CorrelationIdServletFilter = mock(
    CorrelationIdServletFilter.class);
CorrelationIdServletFilter.init(mock(FilterConfig.class));

CorrelationIdServletFilter.doFilter(httpServletRequest, httpServletResponse,
    filterChain);


System.out.println(httpServletResponse.getHeaderNames());

CorrelationIdServletFilter.destroy();

verify(CorrelationIdServletFilter, times(1))
    .doFilter(httpServletRequest, httpServletResponse, filterChain);

}

有什么办法我能做到吗?任何帮助都将不胜感激。有没有办法不用嘲弄?

1 回复 | 直到 6 年前

Apoorv Agarwal 6 年前

您编写的测试的一些主要问题:

init 以及 destroy doFilter 方法。
当我们创建任何模拟对象时,我们使用期望来定义我们期望对模拟对象进行的调用,并让它们在需要时返回一些存根值。

现在,我已经尝试编写正确的测试来断言您要测试的两个案例:

@Test
public void testResponse_for_RequestWithoutCcid() throws IOException, ServletException {

HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);
HttpServletResponse httpServletResponse = mock(HttpServletResponse.class);
FilterChain filterChain = mock(FilterChain.class);
CorrelationIdServletFilter correlationIdServletFilter = new CorrelationIdServletFilter();

expect(httpServletRequest.getHeader(CORRELATION_ID_HEADER_NAME)).andReturn(""); // Empty correlation id in the request

Capture capturedCorrelationIdRaw = newCapture();

httpServletResponse.addHeader(CORRELATION_ID_HEADER_NAME, capture(capturedCorrelationIdRaw));
expectLastCall(); // used for void methods in EasyMock framework

filterChain.doFilter(httpServletRequest, httpServletResponse);
expectLastCall();

CorrelationIdServletFilter.doFilter(httpServletRequest, httpServletResponse,
    filterChain);


assertNotEmpty(capturedCorrelationIdRaw.getValue());


verify(httpServletRequest, times(1))
    .getHeader(CORRELATION_ID_HEADER_NAME);
verify(httpServletResponse, times(1))
    .addHeader(CORRELATION_ID_HEADER_NAME, anyString);

}

这个测试需要根据实际使用的测试框架进行更新,但是我已经尽了最大努力让您了解测试应该是什么样子的。