java - 如何避免 Mockito 和 PowerMockito 之间的冲突？

Question

我需要测试几个非常简单的类。第一个是 Child 类:

public class Child extends Parent {

    public int newMethod() {
        anotherMethod();
        protectedMethod();
        return protectedMethodWithIntAsResult();
    }

    public void anotherMethod() {
        // method body no so important
    }
}

比起我有一个 Parent 类:

public class Parent {
    protected void protectedMethod() {
        throw new RuntimeException("This method shouldn't be executed in child class!");
    }

    protected int protectedMethodWithIntAsResult() {
        throw new RuntimeException("This method shouldn't be executed in child class!");
    }
}

最后是我的单一测试方法的测试类:

@PrepareForTest({Child.class, Parent.class})
public class ChildTest extends PowerMockTestCase {

    @Test
    public void test() throws Exception {

        /** Given **/
        Child childSpy = PowerMockito.spy(new Child());
        PowerMockito.doNothing().when(childSpy, "protectedMethod");
        PowerMockito.doReturn(100500).when(childSpy, "protectedMethodWithIntAsResult");

        /** When **/
        int retrieved = childSpy.newMethod();

        /** Than **/
        Assert.assertTrue(retrieved == 100500);
        Mockito.verify(childSpy, times(1)).protectedMethod();
        Mockito.verify(childSpy, times(1)).protectedMethodWithIntAsResult();
        Mockito.verify(childSpy, times(1)).anotherMethod(); // but method was invoked 3 times.
    }
}

我对上次验证有疑问。程序抛出异常:

org.mockito.exceptions.verification.TooManyActualInvocations: 
child.anotherMethod();
Wanted 1 time:
-> at my.project.ChildTest.test(ChildTest.java:30)
But was 3 times. Undesired invocation:

我不明白为什么。知道为什么会这样吗？

Answer 1

当您调用 int retrieved = childSpy.newMethod() 时会发生问题，因为您正在调用 anotherMethod() 和 protectedMethod().

Mockito 假定您将只调用每个方法，但 newMethod 会在内部调用 protectedMethod 和 anotherMethod 和 anotherMethod 已经被调用过一次。

如果您删除对 newMethod 或 anotherMethod 的调用，测试将正常运行。