如何模拟对成员变量初始化的静态调用？

Question

我正在尝试为助手类创建测试，但无法在助手类内部模拟静态调用。

这是我要测试的课程：

public class NoteHelper {

    private NoteService noteService = ServiceBuilder.getService(NoteService.class);

    public NoteResponse createNewNote(NoteRequest noteRequest) throws NotAuthorizedException {

        Note note = new Note();
        note.setContent(noteRequest.getContent());

        noteService.addNote(note); // throws NotAuthorizedException

        NoteResponse noteResponse = new NoteResponse();
        noteResponse.setContent(note.getContent());

        return noteResponse;
    }
}

这是我的考试班：

@RunWith(PowerMockRunner.class)
public class NoteServiceHelperTest {

    String dummyContent = "ABCD";

    @InjectMocks
    private NoteHelper noteHelper;

    @Mock
    private NoteService noteService;

    @Before
    public void setUp() {

        MockitoAnnotations.initMocks(this);
    }

    @Test
    @PrepareForTest({NoteHelper.class, ServiceBuilder.class})
    public void createNewNoteTest() throws NotAuthorizedException {

        noteService = Mockito.mock(NoteService.class);

        PowerMockito.mockStatic(ServiceBuilder.class);
        PowerMockito.when(ServiceBuilder.getService(NoteService.class))
                .thenReturn(noteService);
        doNothing().when(noteService).addNote(any(Note.class));

        NoteRequest request = new NoteRequest();
        request.setContent(dummyContent);

        NoteResponse response = noteHelper.createNewNote(request);

        assertEquals(response.getContent(), dummyContent);
    }
}

根据我的阅读，我认为对ServiceBuilder.getService(...)的调用将被替换，而noteService将使用模拟实例而不是真实实例。

问题是这种情况没有发生，实际上由于某些外部系统依赖性而实际上调用了getService(...)方法，并最终失败了（ServiceBuilder.getService(...)需要获取一些数据库连接并对其他系统进行HTTP调用返回NoteService实例之前。

所以我的问题是我如何使用Power Mockito模拟getService(...)和noteService.addNote(note)调用？