Spring boot: writing Integration tests to service layer

In my previous post, I explained how to write unit tests. In this post, I am going to explain how to write integration tests to service layer.

This is continuation to my previous post, You can download previous working application from this link.

Step 1: Create a class by annotating it with @RunWith and @SpringBootTest annotations.

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = App.class)
public class EmployeeServiceIntegrationTest {
 .....
 .....
}

SpringJUnit4ClassRunner is a custom extension of JUnit's BlockJUnit4ClassRunner which provides functionality of the Spring TestContext Framework to standard JUnit tests.

When a class is annotated with @RunWith or extends a class annotated with @RunWith, JUnit will invoke the class it references to run the tests in that class instead of the runner built into Junit.

@ SpringBootTest annotation should be specified on a test class that runs Spring Boot based tests.

Step 2: Autowire the service class and use it while testing.

@Autowired

private EmployeeService employeeService;

EmployeeServiceIntegrationTest.java

package com.sample.app.service;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

import java.util.Optional;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.sample.app.App;
import com.sample.app.model.Employee;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = App.class)
public class EmployeeServiceIntegrationTest {

 @Autowired
 private EmployeeService employeeService;

 @Test
 public void testCreateEmployee() {
  Employee emp = new Employee();
  emp.setFirstName("Ram");
  emp.setLastName("Gurram");

  Employee cratedEmp = employeeService.createEmployee(emp);

  assertEquals(cratedEmp.getFirstName(), "Ram");
  assertEquals(cratedEmp.getLastName(), "Gurram");

  Optional<Employee> empOptional = employeeService.getEmployee(cratedEmp.getId());

  if (!empOptional.isPresent()) {
   assertFalse("No employee exist with id : " + cratedEmp.getId(), true);
  }

  Employee persistedEmp = empOptional.get();

  assertEquals(persistedEmp.getFirstName(), "Ram");
  assertEquals(persistedEmp.getLastName(), "Gurram");
 }
}

Total project structure looks like below.

You can download complete working application from this link.

Previous                                                    Next                                                    Home