How do I unit test my REST Controller using Junit and Mockito?

Question

I have written a simple method in my controller as part of my Java Spring Boot Application which works without issue using and I have tested it using Postman. However I am unsure how to unit test this using Junit and Mockito. I have shown a snippet of my code below, first is my Controller.java class and then my test is within a ControllerTest.java. How can I unit test this correctly?

EDIT: I know my test case is the problem, I have removed it as all comments are focusing on why it is wrong. I am asking how do I write a unit test case for this specific saveCase method.

I have already tried looking at examples from below links Rest Controller Unit Test Spring RestController + Junit Testing

@Autowired Service service; @PostMapping("/savecase") public ResponseEntity<PIECase> saveCase(@Valid @RequestBody PIECase pieCase) { return ResponseEntity.ok(pieService.saveCase(pieCase)); }

"can't seem to get the correct result" What is the "correct" result? What is the actual result? — Michael
– Michael, Commented Aug 23, 2019 at 13:10
The test is supposed to verify that the controller works as it should, i.e. returns a PIECase object serialized to JSON. But your test checks that the response is "some expected response". To make it simpler, you test is the equivalent of testing that a service adding 2 to 3 return 42. The test is the problem. — JB Nizet
– JB Nizet, Commented Aug 23, 2019 at 13:35

vaquar khan · Accepted Answer · 2019-08-23 13:54:18Z

You need to Mock all service which is calling inside your Restcontroller so will not get Nullpointer exception

RunWith(MockitoJUnitRunner.class) declaration which will cause @Mock and @InjectMocks annotation to work automatically without any explicit initialization

 package com.khan.vaquar.controller; import static org.junit.Assert.assertNull; import static org.junit.Assert.assertTrue; import java.io.IOException; import javax.servlet.http.HttpServletRequest; import org.apache.log4j.Logger; import org.json.JSONException; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.InjectMocks; import org.mockito.Mock; import org.mockito.junit.MockitoJUnitRunner; import org.owasp.esapi.errors.IntrusionException; import org.owasp.esapi.errors.ValidationException; import org.springframework.beans.factory.annotation.Autowired; import com.fasterxml.jackson.core.JsonProcessingException; @RunWith(MockitoJUnitRunner.class) public class RestControllerTest { private static Logger log = Logger.getLogger(RestControllerTest.class.getName()); @InjectMocks private RestController restController; @Mock private RestServiceImpl restServiceImpl; @Mock private RestResponseBuilder restResponseBuilder; @Mock private HttpServletRequest request; @Autowired RuleEngine ruleEngine; @Test public void testRestControllereFlow() throws Exception { String inputJson="{ \r\n" + " \"Data\":{ \r\n" + " \"personalInfo\":{ \r\n" + " \"User\":{ \r\n" + " \"email\":\"[email protected]\",\r\n" + " \"name\": \"vaquar khan\"\r\n" + " " , }}+ "}"; Response response =null; try { response=restController.restControllerMethd(inputJson); }catch(Exception e){ // e.printStackTrace(); } assertNotNull(response); } }

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