Java 如何测试doFilter方法？

我尝试测试此方法：

public void doFilter(final ServletRequest request, final ServletResponse response,
    final FilterChain chain) throws IOException, ServletException {

    final HttpServletRequest httpRequest = (HttpServletRequest) request;
    final HttpServletResponse httpResponse = (HttpServletResponse) response;

    if (httpRequest.getSession(true).getAttribute("connected") == null) {
        httpResponse.sendRedirect(request.getServletContext().getContextPath() + "/");
    } else {
        chain.doFilter(request, response);
    }
}

以下是我的测试：

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

    MockServletContext servletContext = new MockServletContext();
    MockHttpServletRequest request = new MockHttpServletRequest(servletContext);
    MockHttpServletResponse response = new MockHttpServletResponse();
    MockHttpSession session = new MockHttpSession();
    FilterChain chain = Mockito.mock(FilterChain.class);
    String url = "/private/";
    request.setContextPath("/private/");

    UserFilter userfilter = new UserFilter();
    userfilter.doFilter(request, response, chain);
    Mockito.verify(chain, Mockito.times(0)).doFilter(request, response);
    request.setSession(session);
    request.getSession().setAttribute("connected", "toto");
    Mockito.verify(chain, Mockito.times(1)).doFilter(request, response);
}

但是最后一个Mockito.verify不运行。我什么时候也不明白

request.getAttribute("connected")

我获得了

“toto”

，但当我获得时

null

request.getSession(true).getAttribute("connected").

你能解释一下并帮助我吗？

---

感谢最后的

Mockito.verify（chain，Mockito.times（1））.doFilter（request，response）失败，因为请求的会话包含键/值“已连接”，因此未调用
doFilter

关于
request.getAttribute（“connected”）
vs
request.getSession（true）.getAttribute（“connected”）
，我得到了第一个
null
，第二个
toto