java - Mockito.verify和Mockito.doNothing在Junit测试用例中不起作用

我已经发布了与我使用Mockito.verify（）或doNothing（）编写用于创建方法的测试用例的要求相匹配的示例代码。我想验证ClassB的create（）方法时是否返回true或doNothing（）而不返回DB。我尝试了自己不适合我的不同方式，并在Test Class中对输出进行了注释。任何帮助将不胜感激

 public class ClassA {
        ClassB b=new ClassB();

        public TestPojo create(TestPojo t) {
            TestPojo t2= b.create(t);
            return t2;
        }
    }

    public class ClassB {

    public TestPojo create(TestPojo t) {
        System.out.println("class b");
            return t;
        }

    }

public class TestPojo {

    private Integer id;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;

    public class ClassTest {


            @Test
            public void testCreate_1()
                throws Exception {
                ClassA testA=Mockito.spy(new ClassA());
                ClassB testB=Mockito.spy(new ClassB());
                TestPojo test=Mockito.spy(new TestPojo());
                test.setId(1);
                //Mockito.verifyZeroInteractions(testB); -- testcase is passed but executing ClassB method but this not our intension
                //Mockito.verify(testB).create(test); --error output : Wanted but not invoked
                //Mockito.doNothing().when(testB).create(test); --error output : Only void methods can doNothing()!
                TestPojo act=testA.create(test);
                //System.out.println(act.getId());

            }
        @Before
        public void setUp()
            throws Exception {
        }
        @After
        public void tearDown()
            throws Exception {
            // Add additional tear down code here
        }
        public static void main(String[] args) {
            new org.junit.runner.JUnitCore().run(ClassTest.class);
        }

    }

最佳答案

它对您不起作用，因为实际上没有将创建的实例testB分配给b中的字段ClassA。要使其正常工作，您需要设置模拟实例并添加验证检查。

@Test
public void testCreate_1() throws Exception {
    ClassA testA = Mockito.spy(new ClassA());
    ClassB testB = Mockito.mock(ClassB.class);
    // set spied instance to testA
    testA.b = testB;
    // you don't need to spy on test, as you're not verifying anything on it
    TestPojo test = new TestPojo();
    test.setId(1);
    // execute your test method
    TestPojo act = testA.create(test);
    // verify that required create method with proper argument was called on testB
    Mockito.verify(testB, Mockito.times(1)).create(Matchers.eq(test));
    // verify that nothing else executed on testB
    Mockito.verifyNoMoreInteractions(testB);
}

希望能帮助到你！