Junit for RestController - Assertion Error

Question

I have created an rest api and tested via postman and able to get success response as expected. Now i have created Junit test case for the above api but while executing getting "java.lang.AssertionError: Status expected:<200> but was:<415> ". Not able to figure out why this exception is happening.

I'm new to both Mockito and MockMVC so any help would be appreciated.

Below is my test class

package com.example.demo.hystricks;

import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import java.io.Serializable;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;

import org.apache.commons.lang.SerializationUtils;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.MockitoAnnotations;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import com.example.demo.DemoController;
import com.example.demo.DemoService;
import com.example.demo.InputModel;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = DemoController.class)
public class DemoControllerTest {

private MockMvc mockMvc;

@InjectMocks
private DemoController demoController;

@MockBean
private DemoService demoService;

@MockBean
private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;

@Before
public void setUp() {

    MockitoAnnotations.initMocks(this);
    DemoController demoController = new DemoController(demoService);
    this.mockMvc = MockMvcBuilders
            .standaloneSetup(demoController).
            setMessageConverters(mappingJackson2HttpMessageConverter).build();

}

@Test
public void postData() throws Exception {

    InputModel inputModel = new InputModel("12345","Test","CSC",getEventTime());
    System.out.println("before api....");
    RequestBuilder requestBuilder  = MockMvcRequestBuilders.post("/demoService")
            .accept(MediaType.APPLICATION_JSON)
            .content(inputModel.toString())
            .contentType(MediaType.APPLICATION_JSON);
    mockMvc.perform(requestBuilder)
    .andDo(MockMvcResultHandlers.print())
    .andExpect(status().isOk());
    System.out.println("after api....");
}

private LocalDateTime getEventTime() {

    Instant instant = Instant.ofEpochMilli(Instant.now().toEpochMilli());
    LocalDateTime eventTimestamp = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    return eventTimestamp;
}

}

My Rest Controller

@RestController
public class DemoController {

private static final Logger LOGGER = LoggerFactory.getLogger(DemoController.class);

public final DemoService demoService;

public DemoController(DemoService demoService) {
    this.demoService = demoService;
}

@RequestMapping(value = "demoService",method = RequestMethod.POST)
public ResponseEntity<String> postData(
        @RequestBody InputModel inputModel){

    LOGGER.info("DemoService Entered successfully");
    demoService.postData(inputModel.getId(),inputModel.getName(),
            inputModel.getDepartment(), inputModel.getJoinDate());
    LOGGER.info("DemoService Exited successfully");
    return new ResponseEntity<String>("success",HttpStatus.OK) ;
}

}

Console Message before api:

>2018-10-16 12:15:49.391  WARN 6200 --- [           main] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json' not supported]
2018-10-16 12:15:49.437  INFO 6200 --- [       Thread-3] o.s.w.c.s.GenericWebApplicationContext   : Closing org.springframework.web.context.support.GenericWebApplicationContext@5023bb8b: startup date [Tue Oct 16 12:15:48 IST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@76a4ebf2

Failure Stack Trace:

>java.lang.AssertionError: Status expected:<200> but was:<415>
at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:55)
at org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:82)
at org.springframework.test.web.servlet.result.StatusResultMatchers.lambda$matcher$9(StatusResultMatchers.java:619)
at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:178)
at com.example.demo.hystricks.DemoControllerTest.postData(DemoControllerTest.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Your test is wrong. Remove your @Before method, spring does all of that for you. Remove the DemoController and MappingJackson2HttpMessageConverter fields from the test and add @AUtowired to your MockMvc field. You want a web slice test but are working hard around the framework. Finally I doubt that inputModel.toString() will create a valid JSON body. — M. Deinum
– M. Deinum, Commented Oct 16, 2018 at 7:34

Aditya Narayan Dixit · Accepted Answer · 2018-10-16 08:15:58Z

1

The issue is on this line:

 @MockBean
 private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;

You are mocking this converter. Create a instance using new instead:

this.mockMvc = MockMvcBuilders
        .standaloneSetup(controller).
        setMessageConverters(new MappingJackson2HttpMessageConverter()).build();

Or as rightly mentioned by M. Dienum, you can do away with the below 2 lines from setUp() method and it'll work:

DemoController demoController = new DemoController(demoService);
this.mockMvc = MockMvcBuilders
        .standaloneSetup(demoController).
        setMessageConverters(mappingJackson2HttpMessageConverter).build();

After doing all this if you run into 400 error then your toString() method isn't producing valid json.

edited Oct 16, 2018 at 8:15

answered Oct 16, 2018 at 8:08

Aditya Narayan Dixit

2,12915 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Aravindkumar Over a year ago

I have removed @MockBean private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter; and created new instance instead. It worked. Thanks M.Dienum and Aditya

Damonio Over a year ago

Thank you so much!, I was trying to find a way to restrict the spring boot context by specifying the classes that I wanted to use to test, but the moment I did that, some autoconfiguration was missed for MockMvc, I did what you mentioned about creating a new instance of the mapping jackson and adding it and it worked like a charm!!! ``` this.mockMvc = MockMvcBuilders .standaloneSetup(controller). setMessageConverters(new MappingJackson2HttpMessageConverter()).build(); ```

Collectives™ on Stack Overflow

Junit for RestController - Assertion Error

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related