我有一个类，我试着测试它，它创建了一个AWSSepFunctions类型的新对象，我试着模拟它，返回一个相同类型的模拟。我不能改变这行原始代码，我只能添加测试，所以我想知道我该如何模拟它。
这个班级看起来是这样的

Class class{
    public Object handleRequest(Object object, Context context) {
        AWSStepFunctions client = AWSStepFunctionsClientBuilder.standard().withClientConfiguration(new ClientConfiguration()).build();
        client.startExecution(...);
    }
}

测试代码如下所示-

public class ClassTest {
    @Test
    public void testHandlerRequest() {
        mockStatic(AWSStepFunctionsClientBuilder.class);  //mockStatic() and when() from PowerMockito
        AWSStepFunctions awsStepFunctionsMock = mock(AWSStepFunctions.class);
        AWSStepFunctionsClientBuilder awsStepFunctionsClientBuilder = mock(AWSStepFunctionsClientBuilder.class);
        ClientConfiguration configuration = mock(ClientConfiguration.class);

        PowerMockito.whenNew(ClientConfiguration.class).withAnyArguments().thenReturn(awsStepFunctionsMock);

        when(awsStepFunctionsClientBuilder.standard()).thenReturn(awsStepFunctionsClientBuilder);        
        when(awsStepFunctionsClientBuilder.withClientConfiguration()).thenReturn(awsStepFunctionsClientBuilder);
        when(awsStepFunctionsClientBuilder.build()).thenReturn(awsStepFunctionsMock);
        ... more when-thenreturns
    }
}

我遇到了一些错误，例如clientBuilder的模拟出现了NoSuchMethodError。
我尝试使用PowerMockito的whenNew来模拟创建AWSSepFunctions类型的新对象- PowerMockito.whenNew（AWSSepFunctions.class）.withAnyArguments（）.thenReturn（awsStepFunctionsMock），但似乎效果不佳。有没有办法正确返回这个模拟结果？