PowerMockito调用的是真正的方法，而不是模拟的私有方法

Question

我有一个类，它有一个私有方法，并在其主体中调用另一个私有方法。所以我想调用第一个私有方法并模拟第二个。下面是一个示例：

public class ClassWithPrivateMethod {
    private int count;
    public ClassWithPrivateMethod() {
    }
    private void countDown() {
        while (isDecrementable())
            count--;
    }
    private boolean isDecrementable() {
        throw new IllegalArgumentException();
//        if (count > 0) return true;
//        return false;
    }
}

和测试类：

@RunWith(PowerMockRunner.class)
@PrepareForTest(ClassWithPrivateMethodTest.class)
public class ClassWithPrivateMethodTest {
    private int count;
    private ClassWithPrivateMethod classWithPrivateMethod;
    @Before
    public void setUp() throws Exception {
        count = 3;
        classWithPrivateMethod = PowerMockito.spy(new ClassWithPrivateMethod());
    }
    @Test
    public void countDown() throws Exception {
        Whitebox.setInternalState(classWithPrivateMethod, "count", count);
        PowerMockito.doReturn(true, true, false).when(classWithPrivateMethod, "isDecrementable");
        Whitebox.invokeMethod(classWithPrivateMethod, "countDown");
        int count = Whitebox.getInternalState(classWithPrivateMethod, "count");
        assertEquals(1, count);
        PowerMockito.verifyPrivate(classWithPrivateMethod, times(3)).invoke("isDecrementable");
    }
}

我通过Whitebox.invokeMethod(classWithPrivateMethod, "countDown");调用了第一个私有方法，并像这样模拟第二个方法，PowerMockito.doReturn(true, true, false).when(classWithPrivateMethod, "isDecrementable");。如您所见isDecrementable方法在调用时应返回true、true、false值，但 PowerMockito 正在调用实方法。

我正在使用这些依赖项：

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito</artifactId>
    <version>1.6.5</version>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>1.6.5</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>1.10.19</version>
</dependency>

我的测试有什么问题？

Answer 1

我在这一行中发现了错误：

@PrepareForTest(ClassWithPrivateMethodTest.class)

它应该是：

@PrepareForTest(ClassWithPrivateMethod.class)