add tests

src/main/java/com/github/nkzawa/socketio/client/Manager.java

@@ -79,7 +79,7 @@ public class Manager extends Emitter {
     private List<Packet> packetBuffer;
     private Queue<On.Handle> subs;
     private IO.Options opts;
-    private com.github.nkzawa.engineio.client.Socket engine;
+    /*package*/ com.github.nkzawa.engineio.client.Socket engine;
     private Parser.Encoder encoder;
     private Parser.Decoder decoder;
 
@@ -92,6 +92,14 @@ public class Manager extends Emitter {
     private ScheduledExecutorService reconnectScheduler = Executors.newSingleThreadScheduledExecutor();
 
 
+    public Manager() {
+        this(null, null);
+    }
+
+    public Manager(URI uri) {
+        this(uri, null);
+    }
+
     public Manager(IO.Options opts) {
         this(null, opts);
     }

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

@@ -50,7 +50,7 @@ public class Socket extends Emitter {
     private boolean disconnected = true;
     private int ids;
     private String nsp;
-    private Manager io;
+    /*package*/ Manager io;
     private Map<Integer, Ack> acks = new HashMap<Integer, Ack>();
     private Queue<On.Handle> subs;
     private final Queue<List<Object>> buffer = new LinkedList<List<Object>>();