Hi, just wanted to ask how do I cast an object to another to use for testing. This is my target class with a method called createByteData that has 3 parameters (IByteMessage, IByteMessage, IByteMessage). telegaram is an instance of IByteMessage.

​

byteData = controller.createByteData((IByteMessage) extensionHeader, (IByteMessage) header, telegaram);

this is my test class:

@Test

    public void test017() {
       when(logger.isTrace()).thenReturn(true);
       ITelegramExtensionHeader tempextheader = mock(ITelegramExtensionHeader.class);
       ITelegramHeader tempheader = mock(ITelegramHeader.class);
       IByteMessage tempmessage = mock(IByteMessage.class);
       AppDiscrimination tempapp = mock(AppDiscrimination.class);
       IByteMessage msg1 = mock(IByteMessage.class);
       IByteMessage msg2 = mock(IByteMessage.class);

       DataNotifyQueueData result = null;      

       byte[] i = {4, 5};

       when(tempmessage.toByteArray()).thenReturn(i);

       when((IByteMessage) tempextheader).thenReturn(msg1);
       when((IByteMessage) tempheader).thenReturn(msg2);

       result = m.createDataNotifyQueueDataInfo(tempextheader, tempheader, tempmessage, tempapp, "gramid", "this_is_the_value", true);
    }

the test class is a bit of a mess out of the trial and error I did, initially I didn't have the thenReturn(msg1) and thenReturn(msg2) I just added that hoping it might work. the error is below. I don't know but the target test class came with the code to cast ITelegramExtensionHeader and ITelegramHeader to IByteMessage so I am assuming it can be done. But when I run my test class it just gives this error. I don't know how to proceed from here. Any help? Thank you.

error:

java.lang.ClassCastException: jp.vic.vis.ps.telegram.inp.ITelegramExtensionHeader$MockitoMock$1374956466 cannot be cast to jp.co.mitsubishielectric.kouei.xftbase.bytemessage.IByteMessage
       at jp.vic.vis.ps.queue.AppQueueControllerTest.__CLR4_3_1v2uf1xesd(AppQueueControllerTest.java:363)
       at jp.vic.vis.ps.queue.AppQueueControllerTest.test017(AppQueueControllerTest.java:351)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
       at java.lang.reflect.Method.invoke(Unknown Source)