		subMsgRequest.setMask(TestConstants.mask);
		subMsgResponse = publishService.changeSubscription(subMsgRequest);
		Assert.assertNotNull("the session ID is null", publishService.getSessionId());
		Assert.assertEquals("message body is not the same length", subMsgRequest.getDataLength(), subMsgResponse.getDataLength());
		Assert.assertEquals("compression is not the same", subMsgRequest.isCompressed(), subMsgResponse.isCompressed());

		publishService.unsubscribe();
		Assert.assertNull("the session ID is not null", publishService.getSessionId());
	}

	/**
	 * Description: change subscription with the same mask<br>
