Spring Controller ModelAndView test MockMvc empty Response
Question
I have this simple example setup to unit test spring Controller ModelAndView with MockMvc, but the response is always empty, even though in debug I can see that the controller code is executed.
Here's the code:
/src/main/java/controller/MvcController.java
package controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class MvcController {
@RequestMapping("/hello/{id}")
public ModelAndView hello(@PathVariable("id") String id) {
Map<String, String> model = new HashMap<>();
ModelAndView modelAndView = new ModelAndView("hello", model);
return modelAndView;
}
}
/src/main/webapp/WEB-INF/jsp/hello.jsp
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="e"
uri="https://www.owasp.org/index.php/OWASP_Java_Encoder_Project"%>
<%@ page contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
</head>
<body>HELLO WORLD
</body>
</html>
/src/test/java/controller/MvcControllerTest.java
package controller;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = { MvcController.class })
public class MvcControllerTest {
@Autowired
private MvcController mvcController;
private MockMvc mockMvc;
@Before
public void init() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
this.mockMvc = MockMvcBuilders.standaloneSetup(mvcController).setViewResolvers(resolver).build();
}
@Test
public void testHello() throws Exception {
RequestBuilder requestBuilder = MockMvcRequestBuilders.get("/hello/XWQHEDg9e72t");
ResultActions result = mockMvc.perform(requestBuilder);
MvcResult mvcResult = result.andReturn();
MockHttpServletResponse mockHttpServletResponse = mvcResult.getResponse();
String response = mockHttpServletResponse.getContentAsString();
assertThat(response).contains("HELLO WORLD");
}
}
1 answers
solution1
1 ACCPTED 2021-03-15 17:02:12
The key word in MockMvc is mock . This framework does not set up a full Servlet container with a JSP engine. As such, it doesn't render the view that your controller returns and the MockHttpServletResponse does not contain a body (for this use case).
You can use MockHttpServletResponse#getForwardedUrl() to get the url of the JSP that the Servlet container would've forwarded the request to, constructed from your view name and the prefix and suffix of your InternalResourceViewResolver .
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