当数据发生变化时，如何测试MutableLiveData<>.observe？

import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Observer;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.mockito.Mockito.verify;

public class ExampleUnitTest {

    @Mock
    private Observer<String> mockObserver;

    private MutableLiveData<String> mutableLiveData;

    @Before
    public void setup() {
        MockitoAnnotations.initMocks(this);
        mutableLiveData = new MutableLiveData<>();
        mutableLiveData.setValue("Initial Value");
    }

    @Test
    public void testMutableLiveDataObserve() {
        mutableLiveData.observeForever(mockObserver);

        // 执行需要测试的操作，使MutableLiveData的值发生变化
        mutableLiveData.setValue("New Value");

        // 使用断言来验证MockObserver是否收到了预期的数据变化通知
        verify(mockObserver).onChanged("New Value");
    }
}