Spring Boot JPA - Unit Test Repository

To test a Repository, we need the following annotation and classes −
@ExtendWith(SpringExtension.class) − Mark the class to run as test case using SpringExtension class.
@ExtendWith(SpringExtension.class) − Mark the class to run as test case using SpringExtension class.
@SpringBootTest(classes = SprintBootH2Application.class) − Configure the Spring Boot application.
@SpringBootTest(classes = SprintBootH2Application.class) − Configure the Spring Boot application.
@Transactional − To mark repository to do CRUD Operation capable.
@Transactional − To mark repository to do CRUD Operation capable.
@Autowired private EmployeeRepository employeeRepository − EmployeeRepository object to be tested.
@Autowired private EmployeeRepository employeeRepository − EmployeeRepository object to be tested.
Following is the complete code of EmployeeRepositoryTest.
package com.tutorialspoint.repository;

import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.ArrayList;
import java.util.List;
import javax.transaction.Transactional;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import com.tutorialspoint.entity.Employee;
import com.tutorialspoint.sprintbooth2.SprintBootH2Application;

@ExtendWith(SpringExtension.class)
@Transactional
@SpringBootTest(classes = SprintBootH2Application.class)
public class EmployeeRepositoryTest {
   @Autowired
   private EmployeeRepository employeeRepository;

   @Test
   public void testFindById() {
      Employee employee = getEmployee();	     
      employeeRepository.save(employee);
      Employee result = employeeRepository.findById(employee.getId()).get();
      assertEquals(employee.getId(), result.getId());	     
   }
   @Test
   public void testFindAll() {
      Employee employee = getEmployee();
      employeeRepository.save(employee);
      List<Employee> result = new ArrayList<>();
      employeeRepository.findAll().forEach(e -> result.add(e));
      assertEquals(result.size(), 1);	     
   }
   @Test
   public void testSave() {
      Employee employee = getEmployee();
      employeeRepository.save(employee);
      Employee found = employeeRepository.findById(employee.getId()).get();
      assertEquals(employee.getId(), found.getId());	     
   }
   @Test
   public void testDeleteById() {
      Employee employee = getEmployee();
      employeeRepository.save(employee);
      employeeRepository.deleteById(employee.getId());
      List<Employee> result = new ArrayList<>();
      employeeRepository.findAll().forEach(e -> result.add(e));
      assertEquals(result.size(), 0);
   }
   private Employee getEmployee() {
      Employee employee = new Employee();
      employee.setId(1);
      employee.setName("Mahesh");
      employee.setAge(30);
      employee.setEmail("mahesh@test.com");
      return employee;
   }
}
Right Click on the file in eclipse and select Run a JUnit Test and verify the result.

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