我正在测试下面的代码，但是测试用例失败了。第23行给出了InvocationTargetException。如果调用了某个其他mock的方法，返回mock是否有问题？
此外，即使我注解了第23行，下面的第26行也会使verify失败。打开调试器会抛出InvocationTargetException。我只是检查fetchSideThing方法是否被调用过一次。我该怎么做呢？

@Getter
@Setter
public class SideThing {
    int weight;

    SideThing(int weight) {
        this.weight = weight;
    }

    public static SideThing get(int w) {
        return new SideThing(w);
    }
}

public class ThingGrandParent {

    int tgpVal;
    ThingGrandParent(int val) {
        tgpVal = val;
    }

    public ThingParent GpFun(int y) {
        return new ThingParent(y);
    }
}

public class ThingParent {

    SideThing st;

    ThingParent(int x) {
        st = new SideThing(x);
    }

    public SideThing fetchSideThing() {
        return st;
    }

    private int anotherFun(int y) {
        return y;
    }
}

@Getter
@Setter
public class Thing {
    private int size;
    private int name;

    Thing() {}

    int bLogic(int size) throws Exception {
        ThingGrandParent tgp = fun(size);
        SideThing st;

        ThingParent tp = tgp.GpFun(size);
        st = tp.fetchSideThing();
        return st.getWeight();
    }

    public ThingGrandParent fun(int size) {
        return new ThingGrandParent(size);
    }
}

@RunWith(PowerMockRunner.class)
@PowerMockIgnore("javax.management.*")
@PrepareForTest({Thing.class, SideThing.class})
public class ThingTest {

    @Mock
    ThingParent tp;
    @Mock
    ThingGrandParent tgpp;

    Thing t;

    @Before
    public void setup() {
        MockitoAnnotations.initMocks(this);
       t = spy(new Thing()); // does it matter here if `t` is an InjectMocks or a spy?
    }

    @Test
    public void test1() throws Exception {
        when(tgpp.GpFun(anyInt())).thenReturn(tp); // -- line23, why InvocationTargetException?

        assertEquals(4, t.bLogic(4));

        verify(tp, times(1)).fetchSideThing(); //-- line26 InvocationTargetException
    }
}

此外，如代码中所示，如果我对Thing t使用spy或InjectMocks，真的会有什么不同吗？
我已经在setup()中使用了MockitoAnnotations.initMocks(this);，但是它说'initMocks（java.lang.Object）'已经过时了。那么我还应该在这里使用什么呢？
以下是失败消息：

Wanted but not invoked:
tp.fetchSideThing();
-> at com.amazon.configurationeditor.store.ThingTest.test1(ThingTest.java:62)
Actually, there were zero interactions with this mock.

Wanted but not invoked:
tp.fetchSideThing();
-> at com.amazon.configurationeditor.store.ThingTest.test1(ThingTest.java:62)
Actually, there were zero interactions with this mock.

    at com.amazon.configurationeditor.store.ThingTest.test1(ThingTest.java:62)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:326)
    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:310)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:298)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:218)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:160)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:134)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:136)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:117)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)