为什么我在使用 PowerMockRunner 运行时不能使用 @InjectMocks 字段匹配?

I've run into an issue in which the field injection matching for Mockito's @Mock annotation for @InjectMocks is not working in the case where there are 2 @Mocks of the same type. I've used the @Mock (name = "name_of_var") syntax as well, but it still failed...

这是被测试的类:

    import java.util.Date;
    public class Parent{

    private Date dateA;
    private Date dateB;

    public void setDateA(Date _dateA){
       dateA = _dateA;
    }

    public void setDateB(Date _dateB){
       dateB = _dateB;
    }

    public Date getDateA(){
       return dateA;
    }

    public Date getDateB(){
       return dateB;
    }

这是测试本身:

    @RunWith(PowerMockRunner.class)
    @PrepareForTest({System.class, Parent.class})
    public class testParent{

    @Mock (name = "dateB")  private Date someOtherDate;
    @Mock (name = "dateA")  private Date someDate;    

    @InjectMocks Parent p;

    @Before
    public void setup(){
        Mockito.when(someOtherDate.getTime()).thenReturn(500l);
        PowerMockito.mockStatic(System.class);
        PowerMockito.when(System.currentTimeMillis()).thenReturn(2000l);
    }

    @Test
    public void testGetDateAGetTimeShouldReturn1000() {
        Mockito.when(someDate.getTime()).thenReturn(1000l);
        Date result = p.getDateA();
        assertEquals(1000l, result.getTime());
    }

    @Test
    public void testGetDateBGetTimeShouldReturn500() {
        Date result = p.getDateB();
        assertEquals(500l, result.getTime());   
    }

测试时，由于 @InjectMocks 不起作用，两个 assertEquals 都会导致 NullPointerException.