test: add test class

src/test/java/io/socket/Fiddle.java

@@ -0,0 +1,40 @@
+package io.socket;
+
+import io.socket.client.IO;
+import io.socket.client.Manager;
+import io.socket.client.Socket;
+import okhttp3.OkHttpClient;
+
+import javax.net.ssl.*;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.net.URI;
+import java.security.*;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.concurrent.ExecutorService;
+
+public class Fiddle {
+
+    public static void main(String[] argz) throws Exception {
+        IO.Options options = new IO.Options();
+
+        Socket socket = IO.socket(URI.create("http://localhost:3000"), options);
+
+        socket.on(Socket.EVENT_CONNECT, (__) -> {
+            System.out.println("connect");
+        });
+
+        socket.on(Socket.EVENT_CONNECT_ERROR, (args) -> {
+            System.out.println("connect_error: " + args[0]);
+        });
+
+        socket.on(Socket.EVENT_DISCONNECT, (args) -> {
+            System.out.println("disconnect due to: " + args[0]);
+        });
+
+        socket.connect();
+    }
+}