如何使用Mockito模拟@Value类?

我想对以下类进行单元测试:

@Data
@AllArgsConstructor
public class MyClass {

   private MyValueClass valueObject;

   public BigDecimal someMethod(int startId, int endId) {

      List<BigDecimal> values = valueObject.get(startId, endId);
      
      ...

我试着嘲笑 MyValueClass 它看起来像:

@Value //lombok annotation
public class MyValueClass {

   private List<Data> someData;

   public List<BigDecimal> get(int startId, int endId) {

       //code to get subset of someData with ids between startId and endId

   }

但是当我运行这个junit(jupiter)测试时:

@ExtendWith(MockitoExtension.class)
class MyClassTest {

   private MyClass myClass;

   @Mock
   private MyValueClass valueOjectMock;

   @BeforeEach
   public void setUp() {
      myClass= new myClass(valueOjectMock);
   }

   @Test
   void test() {
      when(valueOjectMock.get(1,5))
         .thenReturn(new ArrayList<>());
      ....
   }
}

我得到以下错误:

org.mockito.exceptions.base.MockitoException: 
Cannot mock/spy class com.seasset.funds.performance.domain.FundReturns
Mockito cannot mock/spy because :
 - final class
    at org.mockito.junit.jupiter.MockitoExtension.beforeEach(MockitoExtension.java:153)

但是 MyValueClass 不是最终的。为什么会出现此错误?我怎么能嘲笑这门课?