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@InjectMocks is used to Inject @Mock and @Spy Objects into Class being tested.
@InjectMocks looks for @Autowired Annotation inside the Class being tested and Injects @Mock and @Spy Instances.
Application Schema [Result]
Spring Boot Starters
GROUP
DEPENDENCY
DESCRIPTION
Web
Spring Web
Enables: Controller Annotations, Tomcat Server
Syntax
@SpringBootTest
class MyControllerTest {
@Mock PersonRepository personRepositoryMock;
@InjectMocks MyController myController;
MyController
http://localhost:8080/GetPerson
getPerson()
Person
Browser
Tomcat
MyControllerTest
@Mock
PersonRepository
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Create Project: springboot_mockito (add Spring Boot Starters from the table)
Create Package: entities (inside main package)
Create Class: Person.java (inside entities package)
Create Package: respositories (inside main package)
Create Class: PersonRepository.java (inside entities package)
Create Package: controllers (inside main package)
Create Class: MyController.java (inside controllers package)
Create Package: controllers (inside test package src\test\java\com.ivoronline.springboot_junit)
Create Test Class: MyControllerTest.java (inside entities package)
Person.java
package com.ivoronline.springboot_mockito.entities;
public class Person {
//PROPERTIES
public Integer id;
public String name;
public Integer age;
//CONSTRUCTOR
public Person(Integer id, String name, Integer age) {
this.id = id;
this.name = name;
this.age = age;
}
}
PersonRepository.java
package com.ivoronline.springboot_mockito.repositories;
import com.ivoronline.springboot_mockito.entities.Person;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.Map;
@Component
public class PersonRepository {
//PROPERTY
Map<Integer, Person> persons = new HashMap();
//CONSTRUCTOR
public PersonRepository() {
persons.put(1, new Person(1, "John", 20));
persons.put(2, new Person(2, "Bill", 30));
persons.put(3, new Person(2, "Jack", 40));
}
//GET PERSON BY ID
public Person getPersonById(Integer id) {
return persons.get(id);
}
}
MyController.java
package com.ivoronline.springboot_mockito.controllers;
import com.ivoronline.springboot_mockito.entities.Person;
import com.ivoronline.springboot_mockito.repositories.PersonRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class MyController {
@Autowired PersonRepository personRepository;
@ResponseBody
@RequestMapping("/GetPerson")
public String getPerson(@RequestParam Integer id) {
//GET PERSON
Person person = personRepository.getPersonById(id);
String name = person.name;
Integer age = person.age;
//RETURN SOMETHING
return name + " is " + age + " years old";
}
}
MyControllerTest.java
package com.ivoronline.springboot_mockito.controllers;
import com.ivoronline.springboot_mockito.entities.Person;
import com.ivoronline.springboot_mockito.repositories.PersonRepository;
import org.junit.jupiter.api.Test;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.springframework.boot.test.context.SpringBootTest;
import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.Mockito.when;
@SpringBootTest
class MyControllerTest {
//MOCK DEPENDENCY CLASS
@Mock PersonRepository personRepositoryMock;
//INJECT MOCKS (where @autowired is used)
@InjectMocks MyController myController;
@Test
void getPerson() {
//MOCK REPOSITORY METHOD (getPersonById(1) returns Susan instead John for id=1)
when(personRepositoryMock.getPersonById(1)).thenReturn(new Person(1, "Susan", 50));
//TEST CONTROLLER ENDPOINT
String result = myController.getPerson(1);
//TEST RESULT
assertEquals("Susan is 50 years old", result);
}
}
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http://localhost:8080/GetPerson?id=1
Run Test Class: MyControllerTest.java
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>