Deprecated associated test class

Author: drpayyne

app/code/Magento/Sales/Test/Unit/Model/Order/Email/Sender/ShipmentSenderTest.php

@@ -8,7 +8,10 @@
 use Magento\Sales\Model\Order\Email\Sender\ShipmentSender;
 
 /**
- * Test for Magento\Sales\Model\Order\Email\Sender\ShipmentSender class.
+ * Test for Magento\Sales\Model\Order\Email\Sender\ShipmentSender class
+ *
+ * @deprecated since ShipmentSender is deprecated
+ * @see \Magento\Sales\Model\Order\Email\Sender\ShipmentSender
  */
 class ShipmentSenderTest extends AbstractSenderTest
 {