In this tutorial, we will learn how to write a Unit test for Spring Boot PUT REST API using JUnit and Mockito framework.
Learn Spring Boot Unit Testing CRUD REST API with JUnit and Mockito.
Spring boot provides spring-boot-starter-test dependency for unit testing and integration testing of Spring boot application:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
The Spring Boot Starter Test dependency is a primary dependency for testing the Spring Boot Applications. It holds all the necessary elements required for the testing.
For the Unit testing controller layer REST APIs, we gonna use the following testing libraries:
- JUnit 5 Framework
- Mockito 4 (Latest)
- Hamcrest framework
- AssertJ Library
- JsonPath Library
JUnit 5 Framework
It's the de facto standard testing framework for Java.
The current version of JUnit is 5+. The main goal of JUnit 5 is to support Java 8 and above, as well as enable many different styles of testing.
Mockito 4 (Latest)
Mockito is a mocking framework. It is a Java-based library used to create simple and basic test APIs for performing unit testing of Java applications.
The main purpose of using the Mockito framework is to simplify the development of a test by mocking external dependencies and using them in the test code.
Create Spring Boot Application
Using
spring initialize, create a Spring Boot project and add the following dependencies:
- Spring Web
- Spring Data JPA
- Lombok
Generate the Spring boot project as a zip file, extract it, and import it into IntelliJ IDEA.
Make sure that you have added the below dependencies in your spring boot project:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
Create JPA Entity
Next, let's create an Employee JPA entity with the following content:
import lombok.*;
import javax.persistence.*;
@Setter
@Getter
@AllArgsConstructor
@NoArgsConstructor
@Builder
@Entity
@Table(name = "employees")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@Column(name = "first_name", nullable = false)
private String firstName;
@Column(name = "last_name", nullable = false)
private String lastName;
@Column(nullable = false)
private String email;
}
Note that we are using Lombok annotations to reduce the boilerplate code.
Create Repository Layer
Let's create EmployeeRepository which extends the JpaRepository interface:
import net.javaguides.springboot.model.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
public interface EmployeeRepository extends JpaRepository<Employee, Long> {
}
Create Service Layer
EmployeeService
Let's create an EmployeeService interface with CRUD methods:
import net.javaguides.springboot.model.Employee;
import java.util.List;
import java.util.Optional;
public interface EmployeeService {
Employee updateEmployee(Employee updatedEmployee);
}
EmployeeServiceImpl
Let's create an EmployeeServiceImpl class that implements the EmployeeService interface:
import net.javaguides.springboot.exception.ResourceNotFoundException;
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.repository.EmployeeRepository;
import net.javaguides.springboot.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Optional;
@Service
public class EmployeeServiceImpl implements EmployeeService {
private EmployeeRepository employeeRepository;
public EmployeeServiceImpl(EmployeeRepository employeeRepository) {
this.employeeRepository = employeeRepository;
}
@Override
public Employee updateEmployee(Employee updatedEmployee) {
return employeeRepository.save(updatedEmployee);
}
}
Controller Layer - PUT REST API
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.service.EmployeeService;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/api/employees")
public class EmployeeController {
private EmployeeService employeeService;
public EmployeeController(EmployeeService employeeService) {
this.employeeService = employeeService;
}
@PutMapping("{id}")
public ResponseEntity<Employee> updateEmployee(@PathVariable("id") long employeeId,
@RequestBody Employee employee){
return employeeService.getEmployeeById(employeeId)
.map(savedEmployee -> {
savedEmployee.setFirstName(employee.getFirstName());
savedEmployee.setLastName(employee.getLastName());
savedEmployee.setEmail(employee.getEmail());
Employee updatedEmployee = employeeService.updateEmployee(savedEmployee);
return new ResponseEntity<>(updatedEmployee, HttpStatus.OK);
})
.orElseGet(() -> ResponseEntity.notFound().build());
}
}
Unit Test Spring Boot PUT REST API
Now, let's create a Unit test for Spring boot PUT REST API. We gonna use the @WebMvcTest annotation to load only EmployeeController class.
import com.fasterxml.jackson.databind.ObjectMapper;
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.service.EmployeeService;
import org.junit.jupiter.api.Test;
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.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.ResultActions;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import static org.hamcrest.CoreMatchers.is;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.BDDMockito.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
@WebMvcTest
public class EmployeeControllerTests {
@Autowired
private MockMvc mockMvc;
@MockBean
private EmployeeService employeeService;
@Autowired
private ObjectMapper objectMapper;
@Test
public void givenUpdatedEmployee_whenUpdateEmployee_thenReturnUpdateEmployeeObject() throws Exception{
long employeeId = 1L;
Employee savedEmployee = Employee.builder()
.firstName("Ramesh")
.lastName("Fadatare")
.email("ramesh@gmail.com")
.build();
Employee updatedEmployee = Employee.builder()
.firstName("Ram")
.lastName("Jadhav")
.email("ram@gmail.com")
.build();
given(employeeService.getEmployeeById(employeeId)).willReturn(Optional.of(savedEmployee));
given(employeeService.updateEmployee(any(Employee.class)))
.willAnswer((invocation)-> invocation.getArgument(0));
ResultActions response = mockMvc.perform(put("/api/employees/{id}", employeeId)
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(updatedEmployee)));
response.andExpect(status().isOk())
.andDo(print())
.andExpect(jsonPath("$.firstName", is(updatedEmployee.getFirstName())))
.andExpect(jsonPath("$.lastName", is(updatedEmployee.getLastName())))
.andExpect(jsonPath("$.email", is(updatedEmployee.getEmail())));
}
@Test
public void givenUpdatedEmployee_whenUpdateEmployee_thenReturn404() throws Exception{
long employeeId = 1L;
Employee savedEmployee = Employee.builder()
.firstName("Ramesh")
.lastName("Fadatare")
.email("ramesh@gmail.com")
.build();
Employee updatedEmployee = Employee.builder()
.firstName("Ram")
.lastName("Jadhav")
.email("ram@gmail.com")
.build();
given(employeeService.getEmployeeById(employeeId)).willReturn(Optional.empty());
given(employeeService.updateEmployee(any(Employee.class)))
.willAnswer((invocation)-> invocation.getArgument(0));
ResultActions response = mockMvc.perform(put("/api/employees/{id}", employeeId)
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(updatedEmployee)));
response.andExpect(status().isNotFound())
.andDo(print());
}
}
We are using @MockBean annotation to add mock objects to the Spring application context. The mock will replace any existing bean of the same type in the application context.
The @MockBean annotation tells Spring to create a mock instance of EmployeeService and add it to the application context so that it's injected into EmployeeController. We have a handle on it in the test so that we can define its behavior before running each test.
Note that we are using
MockMvc class to make REST API calls.
We are using ResultActions class to handle the response of the REST API.
We are using Mockito to stub the method calls.
Output
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Spring Boot RestClient Delete Request Example
Spring Core Annotations with Examples
Spring Boot @Component Example
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Spring Boot @DependsOn Example
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Spring Boot @GetMapping Example
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Spring Boot @RefreshScope Example
Spring Boot @LoadBalanced Example
Spring Boot @Query Example
Spring Boot @Modifying Example
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Spring Boot JPA @Transient Example
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Spring Boot @CreatedBy Example
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