Bring back impersonator tag.

Author: Simon MacMullen

test/src/com/rabbitmq/client/test/functional/UserIDHeader.java

@@ -19,6 +19,7 @@
 import com.rabbitmq.client.AMQP;
 import com.rabbitmq.client.AlreadyClosedException;
 import com.rabbitmq.client.test.BrokerTestCase;
+import com.rabbitmq.tools.Host;
 
 import java.io.IOException;
 
@@ -41,6 +42,18 @@ public void testInvalidUserId() {
         }
     }
 
+    public void testImpersonatedUserId() throws IOException {
+        Host.rabbitmqctl("set_user_tags guest administrator impersonator");
+        connection = null;
+        channel = null;
+        setUp();
+        try {
+            publish(BAD);
+        } finally {
+            Host.rabbitmqctl("set_user_tags guest administrator");
+        }
+    }
+
     private void publish(AMQP.BasicProperties properties) throws IOException {
         channel.basicPublish("amq.fanout", "", properties, "".getBytes());
         channel.queueDeclare(); // To flush the channel