diff --git a/socks5_test.go b/socks5_test.go
new file mode 100644
index 0000000..5f32e28
--- /dev/null
+++ b/socks5_test.go
@@ -0,0 +1,103 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"net"
+	"testing"
+	"time"
+)
+
+func TestSOCKS5_Connect(t *testing.T) {
+	// Create a local listener
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	go func() {
+		conn, err := l.Accept()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer conn.Close()
+
+		buf := make([]byte, 4)
+		if _, err := io.ReadAtLeast(conn, buf, 4); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		if !bytes.Equal(buf, []byte("ping")) {
+			t.Fatalf("bad: %v", buf)
+		}
+		conn.Write([]byte("pong"))
+	}()
+	lAddr := l.Addr().(*net.TCPAddr)
+
+	// Create a socks server
+	creds := StaticCredentials{
+		"foo": "bar",
+	}
+	conf := &Config{
+		Credentials: creds,
+	}
+	serv, err := New(conf)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Start listening
+	go func() {
+		if err := serv.ListenAndServe("tcp", "127.0.0.1:12365"); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+	time.Sleep(10 * time.Millisecond)
+
+	// Get a local conn
+	conn, err := net.Dial("tcp", "127.0.0.1:12365")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Connect, auth and connec to local
+	req := bytes.NewBuffer(nil)
+	req.Write([]byte{5})
+	req.Write([]byte{2, noAuth, userPassAuth})
+	req.Write([]byte{1, 3, 'f', 'o', 'o', 3, 'b', 'a', 'r'})
+	req.Write([]byte{5, 1, 0, 1, 127, 0, 0, 1})
+
+	port := []byte{0, 0}
+	binary.BigEndian.PutUint16(port, uint16(lAddr.Port))
+	req.Write(port)
+
+	// Send a ping
+	req.Write([]byte("ping"))
+
+	// Send all the bytes
+	conn.Write(req.Bytes())
+
+	// Verify response
+	expected := []byte{
+		socks5Version, userPassAuth,
+		1, authSuccess,
+		5,
+		0,
+		0,
+		1,
+		127, 0, 0, 1,
+		port[0],
+		port[1],
+		'p', 'o', 'n', 'g',
+	}
+	out := make([]byte, len(expected))
+
+	conn.SetDeadline(time.Now().Add(time.Second))
+	if _, err := io.ReadAtLeast(conn, out, len(out)); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	if !bytes.Equal(out, expected) {
+		t.Fatalf("bad: %v", out)
+	}
+}