Mokito

package com.in28minutes.springboot.controller;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mockito;

import org.skyscreamer.jsonassert.JSONAssert;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;

import org.springframework.boot.test.mock.mockito.MockBean;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

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.request.MockMvcRequestBuilders;

import com.in28minutes.springboot.model.Course;

import com.in28minutes.springboot.service.StudentService;

@RunWith(SpringRunner.class)

@WebMvcTest(value = StudentController.class, secure = false)

public class StudentControllerTest {

@Autowired

private MockMvc mockMvc;

@MockBean

private StudentService studentService;

Course mockCourse = new Course("Course1", "Spring", "10 Steps",

Arrays.asList("Learn Maven", "Import Project", "First Example",

"Second Example"));

String exampleCourseJson = "{\"name\":\"Spring\",\"description\":\"10 Steps\",\"steps\":[\"Learn Maven\",\"Import Project\",\"First Example\",\"Second Example\"]}";

@Test

public void retrieveDetailsForCourse() throws Exception {

Mockito.when(

studentService.retrieveCourse(Mockito.anyString(),

Mockito.anyString())).thenReturn(mockCourse);

RequestBuilder requestBuilder = MockMvcRequestBuilders.get(

"/students/Student1/courses/Course1").accept(

MediaType.APPLICATION_JSON);

MvcResult result = mockMvc.perform(requestBuilder).andReturn();

System.out.println("leejo:"+result.getResponse());

String expected = "{id:Course1,name:Spring,description:110 Steps}";

// {"id":"Course1","name":"Spring","description":"10 Steps, 25 Examples and 10K Students","steps":["Learn Maven","Import Project","First Example","Second Example"]}

JSONAssert.assertEquals(expected, result.getResponse()

.getContentAsString(), false);

}

@Test

public void createStudentCourse() throws Exception {

Course mockCourse = new Course("1", "Smallest Number", "1",

Arrays.asList("1", "2", "3", "4"));

// studentService.addCourse to respond back with mockCourse

Mockito.when(

studentService.addCourse(Mockito.anyString(),

Mockito.any(Course.class))).thenReturn(mockCourse);

// Send course as body to /students/Student1/courses

RequestBuilder requestBuilder = MockMvcRequestBuilders

.post("/students/Student1/courses")

.accept(MediaType.APPLICATION_JSON).content(exampleCourseJson)

.contentType(MediaType.APPLICATION_JSON);

MvcResult result = mockMvc.perform(requestBuilder).andReturn();

MockHttpServletResponse response = result.getResponse();

assertEquals(HttpStatus.CREATED.value(), response.getStatus());

assertEquals("http://localhost/students/Student1/courses/1",

response.getHeader(HttpHeaders.LOCATION));

}

}

study this too   https://memorynotfound.com/unit-test-spring-mvc-rest-service-junit-mockito/

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