trigger transport event upon its creation

src/main/java/com/github/nkzawa/engineio/client/Socket.java

@@ -255,13 +255,18 @@ public class Socket extends Emitter {
         opts.policyPort = this.policyPort;
         opts.socket = this;
 
+        Transport transport;
         if (WebSocket.NAME.equals(name)) {
-            return new WebSocket(opts);
+            transport = new WebSocket(opts);
         } else if (Polling.NAME.equals(name)) {
-            return new PollingXHR(opts);
+            transport = new PollingXHR(opts);
+        } else {
+            throw new RuntimeException();
         }
 
-        throw new RuntimeException();
+        this.emit(EVENT_TRANSPORT, transport);
+
+        return transport;
     }
 
     private void setTransport(Transport transport) {
@@ -275,8 +280,6 @@ public class Socket extends Emitter {
 
         this.transport = transport;
 
-        self.emit(EVENT_TRANSPORT, transport);
-
         transport.on(Transport.EVENT_DRAIN, new Listener() {
             @Override
             public void call(Object... args) {