WriteFeedCallbackContext writeFeedContext = EdmMockUtil.getWriteFeedCallBackContext();
try {
Field field = callBack.getClass().getDeclaredField("nextEntitySet");
field.setAccessible(true);
field.set(callBack, EdmMockUtil.mockTargetEntitySet());
WriteFeedCallbackResult result = callBack.retrieveFeedResult(writeFeedContext);
assertEquals(2, result.getFeedData().size());
} catch (SecurityException e) {
fail(ODataJPATestConstants.EXCEPTION_MSG_PART_1 + e.getMessage() + ODataJPATestConstants.EXCEPTION_MSG_PART_2);
} catch (NoSuchFieldException e) {
fail(ODataJPATestConstants.EXCEPTION_MSG_PART_1 + e.getMessage() + ODataJPATestConstants.EXCEPTION_MSG_PART_2);