springboot單元測試mock依賴的類實踐

引入包，測試版本：<powermock.version>1.7.1</powermock.version>

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito2</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>

測試類

//aService類的findStudyInfoById方法內部實現，調用了bDao的方法，
//單元測試只需關心aService當前層的正確性，bDao的正確性由它自己的單元測試保證，
//所以需要模擬一個假的bDao場景，來配合完成aService的單元測試
public class MockTest {

    //注入要測試類,注意這裏注入寫實現類，不能寫接口注入
    @InjectMocks
    private AServiceImpl aService;

    //mock這個類，幫助測試aService，而不測試實際的bDao
    @Mock
    private BDao bDao;

    //初始化測試數據
    @Before
    public void initMock() {
        MockitoAnnotations.initMocks(this);
        Student student = new Student;
        student.setName("測試");
        student.setId(1);
        //初始化mock類的場景，如果傳入一個int，返回自己mock的student數據
        when(bDao.findStudyInfoById(anyInt())).thenReturn(student);
    }

    @Test
    public void findStudyInfoById() throws Exception {
        List<Student> students = aService.findStudyInfoById(1);
        Assert.assertTrue(rstudents.size()==1);
    }

}