在私有方法中模拟方法

Question

@InjectMocks private ClassToTest classToTest;

@Mock private ClassToInject classToInject;

@Before
public void setup() {
initMocks(this);
}

@Test
public void test() {
Classx mockClassObj = Mockito.mock(Classx.class);
when(classToInject.publicMethod1(mockClassObj)).thenReturn(1000);

classToTest.publicMethod();
}

克拉斯托斯特。publicMethod-->classtotest.privateMethod（不是mocking）-->classtoinject.publicMethod1（想要mock）

类如下所示

class ClassToTest {
@Inject ClassToInject classToInject;

public publicMethod() {
privateMethod();
}

private privateMethod() {
int x = classToInject.publicMethod1();
// use the return value
// throw exception
}

Answer 1

您模拟的是classtoinject.publicMethod1(mockClassObj)，而不是classtoinject.publicMethod1()。但是您的代码调用了classtoinject.publicmethod1()；

int x = classToInject.publicMethod1(); // you invoked no parameter method

要调用的Check方法。

如果要调用classtoinject.publicmethod1()，请引用以下代码

@RunWith(MockitoJUnitRunner.class)
public class MockedTest {

    @InjectMocks
    private ClassToTest classToTest;
    
    @Mock
    private ClassToInject classToInject;
    
    @Before
    public void setup() {
        MockitoAnnotations.initMocks(this);
    }
    
    @Test
    public void test() {
        Mockito.when(classToInject.publicMethod1())
                .thenReturn(1000);
        
        classToTest.publicMethod();
    }
    
    
}

class ClassToTest{
    ClassToInject classToInject;
    
    public void publicMethod() {
        privateMethod();
    }
    
    private int privateMethod() {
        int x = classToInject.publicMethod1();
        throw new NullPointerException(String.valueOf(x));
    }
}

class ClassToInject{
    
    public int publicMethod1() {
        return 0;
    }
}

java.lang.NullPointerException: 1000