added test stub

src/interface/tcp_spp_client.rs

@@ -558,4 +558,10 @@ mod tests {
         }
         jh0.join().unwrap();
     }
+
+    #[test]
+    fn test_broken_connection() {
+        // TODO: Verify the client re-connects automatically if the server is dropped and then set
+        // up again.
+    }
 }