PowerMock whenNew Problem On Spring Component Constructor

Question

I have a Spring Service like below:

@Service
public class SendWithUsService
{
    private SendWithUs mailAPI;

    public SendWithUsService()
    {
        this.mailAPI = new SendWithUs();
    }

    public void sendEmailEvent(Dto data)
    {
        try
        {
            SendWithUsSendRequest request = new SendWithUsSendRequest()...;
            mailAPI.send(request);
        }
        catch (Exception e)
        {
           ...
        }
    }
}

And my test code look like below:

@RunWith(PowerMockRunner.class)
@PowerMockIgnore({"javax.net.ssl.*"})
@PrepareForTest(SendWithUsService.class)
public class SendWithUsServiceTest
{
    @InjectMocks
    private SendWithUsService sendWithUsService;

    @Mock
    private SendWithUs mailAPI;

    @Test
    public void sendEmailEvent_successfully() throws Exception
    {
        whenNew(SendWithUs.class).withAnyArguments().thenReturn(mailAPI);
        Dto emailData = ...;
        sendWithUsService.sendEmailEvent(emailData);
        ...
    }
}

In here, PowerMock whenNew method doesn't work. But when I call it outside of constructor like inside the sendEmailEvent method, it is triggered.

Is there a way to handle it?

Works:

public void sendEmailEvent(Dto data)
{
   this.mailAPI = new SendWithUs();
    ...
}

Not works:

 public SendWithUsService()
    {
        this.mailAPI = new SendWithUs();
    }

Answer 1

I've solved it like below:

@RunWith(PowerMockRunner.class)
@PowerMockIgnore({"javax.net.ssl.*"})
@PrepareForTest(SendWithUsService.class)
public class SendWithUsServiceTest
{
    @InjectMocks
    private SendWithUsService sendWithUsService;

    @Mock
    private SendWithUs mailAPI;

    @Before
    public void setUp() throws Exception {   
      whenNew(SendWithUs.class).withAnyArguments().thenReturn(mailAPI);
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void sendEmailEvent_successfully() throws Exception
    {
        Dto emailData = ...;
        sendWithUsService.sendEmailEvent(emailData);
        ...
    }
}