使用 servlet 和 session 进行测试时出现 MissingMethodInvocationException

Question

我正在尝试测试我的 servlet，看看它是否使用会话中传递的一些参数调用我的

DAOService

，但遇到了这个问题

日志：

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
    when(mock.getArticles()).thenReturn(articles);
at Servlet.SupplierServletTest.supplierServlet_StandardTest(SupplierServletTest.java:32)

代码

SupplierServlet supplierServlet = new SupplierServlet();
MockHttpServletRequest request = new MockMvcRequestBuilders.get("/SupplierServlet").buildRequest(new MockServletContext());
MockHttpServletResponse response = new MockHttpServletResponse();
MockHttpSession session = new MockHttpSession();

when(request.getSession()).thenReturn(session); //This is the line 32 that the log mentioned, I deleted the session part and the problem was the same for the following lines
when(request.getParameter("Name")).thenReturn("test"); 
when(request.getParameter("Address")).thenReturn("test");
when(request.getParameter("Phone")).thenReturn("1234");

supplierServlet.processRequest(request, response);
supplierDAO = mock(SupplierDAO.class);
verify(supplierDAO).newSupplier(new Supplier("test", "test", "1234"));

如有任何提示，我们将不胜感激

Answer 1

至于初始化

MockHttpServletRequest

，您应该使用Spring提供的构建器。由于它是 Spring 框架提供的类（并且不是 Mockito 模拟），因此使用 Mockito 模拟其方法将导致错误。

MockHttpServletResponse response = new MockHttpServletResponse();
MockHttpSession session = new MockHttpSession();
MockHttpServletRequest request = MockMvcRequestBuilders.get("/SupplierServlet")
    .session(session)
    .param("Name", "test")
    .param("Address", "test")
    .param("Phone", "1234")
    .buildRequest(new MockServletContext());

supplierServlet.processRequest(request, response);
supplierDAO = mock(SupplierDAO.class);
verify(supplierDAO).newSupplier(new Supplier("test", "test", "1234"));

此外，你的

supplierDAO

模拟毫无用处。模拟对象后，您需要将其注入到被测试的代码中。通常通过将模拟作为函数参数传递来完成。而在您的测试中，您试图验证对从未使用过的模拟的调用。

Answer 2

如果需要模拟行为，请使用 Mockito 模拟的模拟。

我在使用以下测试方法时遇到了同样的错误；

@Test
void testLogicWhenHttpCallShouldForwardToHttp() {
    //Given
    HttpServletRequest request = new MockHttpServletRequest();
    HttpServletResponse response = new MockHttpServletResponse();
    String url = "www.testdomain.com/api/route";

    //When
    Mockito.when(request.getRequestURL()).thenReturn(new StringBuffer("https://" + url));

    //... rest of the code
}

通过如上所述更改模拟来修复它；

@Test
void testLogicWhenHttpCallShouldForwardToHttp() {
    //Given
    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
    String url = "www.testdomain.com/api/route";

    //When
    Mockito.when(request.getRequestURL()).thenReturn(new StringBuffer("https://" + url));

    //... rest of the code
}