教你如何测试Spring Data JPA的Repository

import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.TestPropertySource;
import static org.assertj.core.api.Assertions.*;
@DataJpaTest
@TestPropertySource(locations = "classpath:application-test.properties")
public class MyRepositoryTest {
    @Autowired
    private MyRepository myRepository;
    @Test
    public void testFindByLastName() {
        Person person = new Person("John", "Doe");
        entityManager.persist(person);
        List<Person> persons = myRepository.findByLastName("Doe");
        assertThat(persons).hasSize(1);
        assertThat(persons.get(0).getFirstName()).isEqualTo("John");
    }
}

import static org.mockito.Mockito.*;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
public class MyServiceTest {
    @Mock
    private MyRepository myRepository;
    private MyService myService;
    @BeforeEach
    public void setUp() {
        MockitoAnnotations.initMocks(this);
        myService = new MyService(myRepository);
    }
    @Test
    public void testSomething() {
        when(myRepository.findByName("John")).thenReturn(Optional.of(new Person("John", "Doe")));
        Person person = myService.findPersonByName("John");
        assertNotNull(person);
        assertEquals("Doe", person.getLastName());
    }
}