单元测试开发

1 常用注解

1.1 @ExtendWith(MockitoExtension.class)

使@Mock、@Spy、@InjectMocks等注解生效

1.2 @InjectMocks使用

https://www.jianshu.com/p/bb705a56f620

注意：In Mockito 2 there is a MockitoAnnotations.initMock() method, which is deprecated and replaced with MockitoAnnotations.openMocks() in Mockito 3. The MockitoAnnotations.openMocks() method returns an instance of AutoClosable which can be used to close the resource after the test.

junit5中使用@InjectMocks注解，不需要再调用 MockitoAnnotations.openMocks()使其他被@mock、@spy注解的对象注入生效

https://www.arhohuttunen.com/junit-5-mockito/

2 如何注入需要的非public字段数据

https://www.jianshu.com/p/1b04c698c56b

 ReflectionTestUtils.setField(myController, "myService", myService);

3 mock new对象（采用Mockito.mockConstruction方法）

try (MockedConstruction<Dog> mock = mockConstruction(Dog.class, (mock, context) -> {
    // 这里的mock相当于new出来的mock对象
    Mockito.when(mock.methodWithParam(Mockito.anyString(), Mockito.anyInt())).thenReturn(1); // mock有参的方法
    Mockito.doNothing().when(mock).voidMethod(); // mock无参的方法
})) {
    // creating a mock instance
    Dog dog = new Dog();
    when(dog.makeSound()).thenReturn("Bark");
    assertThat(dog.makeSound()).isEqualTo("Bark");

    // Get a list of all created mocks
    List<Dog> constructed = mock.constructed();
    assertThat(constructed).hasSize(1);
}

4 mock 静态对象

1、注解形式：

@Mock
MockedStatic<StaticObject> staticObject;