java - 当使用内部 void 方法调用的方法调用时，Mockito doNothing 不起作用

Question

主类

public class BootSample {

    public int call(int m) {
        System.out.println("Entering into Call Method");
        int n = m*10;
        TestUtil testUtil = new TestUtil();
        testUtil.add(m, n);
        System.out.println("End of Call Method Value n : " + n);
        return n;
    }

}

实用类

public class TestUtil {

    public void add(int a, int b) {
        System.out.println(" Entering into TestUtil Method ");
        int c = a +b;
        System.out.println(" End of TestUtil Method Value : " + c);
    }

}

测试类

@RunWith(MockitoJUnitRunner.class)
public class BootSampleTest {

    @Mock
    TestUtil testUtil; 

    @Before
    public void setup() {

    }

    @Test
    public void utilSuccess() throws Exception {
        BootSample bootSample = new BootSample();
        doNothing().when(testUtil).add(any(Integer.class),any(Integer.class));
        int result = bootSample.call(10); 
        assertEquals(result,100);
    }

}

输出:

Entering into Call Method
 Entering into TestUtil Method 
 End of TestUtil Method Value : 110
End of Call Method Value n : 100

---

我正在尝试使用 doNothing 模拟 util void 方法调用但不起作用。有人可以帮我解决吗？我在我们的应用程序中遇到了类似的功能。

Answer 1

问题是您的call 方法负责创建一个TestUtil 对象，而该对象不能被模拟。尝试将 TestUtil 添加为构造函数参数，如下所示:

public class BootSample {

    private TestUtil testUtil;

    public BootSample(TestUtil testUtil) {
        this.testUtil = testUtil;
    }

    public int call(int m) {
        System.out.println("Entering into Call Method");
        int n = m*10;
        testUtil.add(m, n);
        System.out.println("End of Call Method Value n : " + n);
        return n;
    }
}

然后您需要模拟 TestUtil 类并将模拟传递给 BootSample 类:

BootSample bootSample = new BootSample(testUtil);