Mockito ArgumentCaptor。如何捕获函数中传递的对象的“实时值”？

Question

我有一个类似

的代码

//src
public class ClassToCapture {
    private int x;
    // setters, getters , constructors, etc ..
}

public class ClassToTest {
    private Sender sender;
    // setters, getters , constructors, etc ..

    public functionToTest() {
        ClassToCapture classToCapture = new ClassToCapture(0);
        sender.send(classToCapture);
        classToCapture.setX(1);
        // some other operation
    }
}

我想捕获由sender.send（）发送的值，并检查它。所以我的测试用例看起来像这样。

//test 
public class Test {
    private Sender sender = mock(Sender.class);
    private ClassToTest target = new ClassToTest(sender);

    public void test() {
        target.functionToTest();
        ArgumentCaptor<ClassToCapture> argumentCaptor = ArgumentCaptor.forClass(ClassToCapture);
        verify(sender).send(argumentCaptor.capture());
        System.out.println(argumentCaptor.getValue().getX()); //printing 1, instead of 0, the "live-value" when the sender.send() was called.
    }
}

似乎ArgumentCaptor正在捕获要传递的对象的引用。有人知道还有其他方法吗？还是我做错了？