求助：Mockito无法Mock Final类方法的替代解决方案

我需要对服务中这段代码的execute()、context()和build()方法做Mock：

Attributes attributes = targetClient.getAttributes(
                    TargetDeliveryRequest.builder()
                            .execute(new ExecuteRequest().mboxes(Collections.singletonList(mboxRequest)))
                            .context(new Context().channel(ChannelType.WEB)).build());

TargetDeliveryRequest是第三方库类，无法修改，核心定义如下：

public class TargetDeliveryRequest {
    ....
    public static TargetDeliveryRequestBuilder builder() {
        return new TargetDeliveryRequestBuilder();
    }

}

我尝试MockTargetDeliveryRequestBuilder：

TargetDeliveryRequestBuilder targetDeliveryRequestBuilder = mock(TargetDeliveryRequestBuilder.class);

但该类是final类，测试时抛出错误：

org.mockito.exceptions.base.MockitoException:
Cannot mock/spy class com.adobe.target.edge.client.model.TargetDeliveryRequestBuilder
Mockito cannot mock/spy because : - final class

TargetDeliveryRequestBuilder的关键代码：

public final class TargetDeliveryRequestBuilder {
    ...
    TargetDeliveryRequestBuilder() {
    }
    ...
    public TargetDeliveryRequestBuilder context(Context context) {
        this.request.context(context);
        return this;
    }

    public TargetDeliveryRequestBuilder execute(ExecuteRequest execute) {
        this.request.execute(execute);
        return this;
    }
    ...
    public TargetDeliveryRequest build() {
        this.setTargetValues();
        this.setVisitorValues();
        this.createVisitorId();
        this.setExperienceCloudValues();
        TargetDeliveryRequest targetDeliveryRequest = TargetDeliveryRequest.fromRequest(this.request);
        targetDeliveryRequest.setLocationHint(this.locationHint);
        targetDeliveryRequest.setSessionId(this.sessionId);
        targetDeliveryRequest.setVisitor(this.visitor);
        targetDeliveryRequest.setDecisioningMethod(this.decisioningMethod);
        return targetDeliveryRequest;
    }
    ...
}

已知添加mockito-inline可解决问题，但项目版本较旧，引入后会破坏大量现有测试，因此该方案不可行。

环境版本：

• Java: 8
• mockito-core: 3.12.4
• powermock-module-junit: 2.0.9
• powermock-api-mockito2: 2.0.9

利用项目已引入的PowerMock依赖，可通过以下步骤实现Mock：

1. 配置测试类注解
   在测试类上添加PowerMock的Runner注解，并指定需要处理的类：

@RunWith(PowerMockRunner.class)
@PrepareForTest({TargetDeliveryRequest.class, TargetDeliveryRequestBuilder.class})
public class YourServiceTest {
    // 测试逻辑
}

2. Mock静态builder方法
   用PowerMock拦截TargetDeliveryRequest.builder()的静态调用，返回Mock的builder实例：

// 静态Mock TargetDeliveryRequest类
mockStatic(TargetDeliveryRequest.class);
TargetDeliveryRequestBuilder mockBuilder = mock(TargetDeliveryRequestBuilder.class);
// 指定builder()返回Mock实例
when(TargetDeliveryRequest.builder()).thenReturn(mockBuilder);

3. Mock链式调用方法
   由于builder采用链式调用（方法返回自身），需要依次Mockexecute()、context()返回自身，再Mockbuild()返回目标对象：

// Mock execute方法，返回builder自身
when(mockBuilder.execute(any(ExecuteRequest.class))).thenReturn(mockBuilder);
// Mock context方法，返回builder自身
when(mockBuilder.context(any(Context.class))).thenReturn(mockBuilder);
// Mock build方法，返回自定义的TargetDeliveryRequest实例（也可以Mock这个实例）
TargetDeliveryRequest mockDeliveryRequest = mock(TargetDeliveryRequest.class);
when(mockBuilder.build()).thenReturn(mockDeliveryRequest);

4. Mock getAttributes方法
   最后MocktargetClient.getAttributes()的返回值，得到你需要的Attributes实例：

TargetClient mockTargetClient = mock(TargetClient.class);
Attributes mockAttributes = mock(Attributes.class);
when(mockTargetClient.getAttributes(mockDeliveryRequest)).thenReturn(mockAttributes);

通过这套配置，就能完整Mock这段链式调用逻辑，无需引入mockito-inline，不会影响现有测试。

内容的提问来源于stack exchange，提问作者Gustavo Rey