Test case which uses @MockBean in Spring Boot application

CustomerServiceTest.java

package com.example.service;

import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
import java.util.Collections;

import com.example.repository.CustomerRepository;
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.boot.test.mock.mockito.MockBean;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerServiceTest {

  @Autowired
  private CustomerService customerService;

  @MockBean(name="customerRepository")
  private CustomerRepository customerRepository;

  @Test
  public void test(){
    when(customerRepository.findAll()).thenReturn(Collections.emptyList());
    assertTrue(customerService.findAll().isEmpty());
  }

}