java - Mockito 为了验证任何匹配器

Question

我在测试 servlet 过滤器时遇到了一些问题。此 servlet 过滤器的目的是在执行 filterChain 后在响应中填充一些 http header 。因此，我要测试的是，在调用 mockFilterChain.doFilter 之前，不会发生对我的 mockHttpServletResponse 的 setHeader 调用。

我正在使用 mockito:mockito-core:1.8.5

所以，这是一个示例代码片段

@Test
public void filterHeaderInjectionHappensLast() throws Exception {
    javax.servlet.Filter myFilter = new HeaderInjectionFilter();

    mockRequest = mock(javax.servlet.http.HttpServletRequest.class);
    mockResponse = mock(javax.servlet.http.HttpServletResponse.class);
    mockFilterChain = mock(javax.servlet.FilterChain.class);

    myFilter.doFilter(mockRequest, mockResponse, mockFilterChain);

    InOrder inOrder = inOrder(mockFilterChain, mockResponse);
    inOrder.verify(mockFilterChain).doFilter(mockRequest,mockResponse);
    inOrder.verify(mockResponse).setHeader(any(String.class),any(String.class));    
}

该测试将无法验证 setHeader 是否传递了任何字符串参数。如果我更改 setHeader 验证调用以接受代码中使用的特定参数，测试将成功通过。像这样验证顺序的时候能不能不使用通配符匹配器？

简化后的 HeaderInjectionFilter 看起来像这样

public class HeaderInjectionFilter implements Filter {
    @Override
    public void destroy() {}

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        filterChain.doFilter(request, response); //Always doFilter before we add header to response

        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader(CACHE_CONTROL, "no-cache");
        httpServletResponse.setHeader(PRAGMA, "no-cache");
    }
}

Answer 1

此测试使用 any(String.class) 失败，因为在提供的 Filter 实现中，对 response.setHeader 进行了两次后续调用。 inOrder.verify 验证交互是否按顺序发生一次。所以从技术上讲，测试可以更改为

@Test
public void filterHeaderInjectionHappensLast() throws Exception {
    javax.servlet.Filter myFilter = new HeaderInjectionFilter();

    mockRequest = mock(javax.servlet.http.HttpServletRequest.class);
    mockResponse = mock(javax.servlet.http.HttpServletResponse.class);
    mockFilterChain = mock(javax.servlet.FilterChain.class);

    myFilter.doFilter(mockRequest, mockResponse, mockFilterChain);

    InOrder inOrder = inOrder(mockFilterChain, mockResponse);
    inOrder.verify(mockFilterChain).doFilter(mockRequest,mockResponse);
    inOrder.verify(mockResponse, times(2)).setHeader(any(String.class),any(String.class));    
}

或者，测试应该明确地测试设置了特定的 header ，这是我要走的路，因为它对于阅读测试的人来说不那么晦涩。