diff --git a/src/test/java/org/fluentd/logger/sender/TestAsyncRawSocketSender.java b/src/test/java/org/fluentd/logger/sender/TestAsyncRawSocketSender.java
new file mode 100644
index 0000000..067e83c
--- /dev/null
+++ b/src/test/java/org/fluentd/logger/sender/TestAsyncRawSocketSender.java
@@ -0,0 +1,251 @@
+package org.fluentd.logger.sender;
+import org.fluentd.logger.util.MockFluentd;
+import org.fluentd.logger.util.MockFluentd.MockProcess;
+import org.junit.Test;
+import org.msgpack.MessagePack;
+import org.msgpack.unpacker.Unpacker;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedInputStream;
+import java.io.EOFException;
+import java.io.IOException;
+import java.net.Socket;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class TestAsyncRawSocketSender {
+
+    @Test
+    public void testNormal01() throws Exception {
+        // start mock fluentd
+        int port = MockFluentd.randomPort();
+        final List<Event> elist = new ArrayList<Event>();
+        MockFluentd fluentd = new MockFluentd(port, new MockFluentd.MockProcess() {
+            public void process(MessagePack msgpack, Socket socket) throws IOException {
+                BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
+                try {
+                    Unpacker unpacker = msgpack.createUnpacker(in);
+                    while (true) {
+                        Event e = unpacker.read(Event.class);
+                        elist.add(e);
+                    }
+                    //socket.close();
+                } catch (EOFException e) {
+                    // ignore
+                }
+            }
+        });
+        fluentd.start();
+
+        // start asyncSenders
+        Sender asyncSender = new AsyncRawSocketSender("localhost", port);
+        Map<String, Object> data = new HashMap<String, Object>();
+        data.put("t1k1", "t1v1");
+        data.put("t1k2", "t1v2");
+        asyncSender.emit("tag.label1", data);
+
+        Map<String, Object> data2 = new HashMap<String, Object>();
+        data2.put("t2k1", "t2v1");
+        data2.put("t2k2", "t2v2");
+        asyncSender.emit("tag.label2", data2);
+
+        // close asyncSender sockets
+        asyncSender.close();
+
+        // wait for unpacking event data on fluentd
+        Thread.sleep(2000);
+
+        // close mock server sockets
+        fluentd.close();
+
+
+        // check data
+        assertEquals(2, elist.size());
+        {
+            Event e = elist.get(0);
+            assertEquals("tag.label1", e.tag);
+            assertEquals("t1v1", e.data.get("t1k1"));
+            assertEquals("t1v2", e.data.get("t1k2"));
+        }
+        {
+            Event e = elist.get(1);
+            assertEquals("tag.label2", e.tag);
+            assertEquals("t2v1", e.data.get("t2k1"));
+            assertEquals("t2v2", e.data.get("t2k2"));
+        }
+    }
+
+
+
+    @Test
+    public void testNormal02() throws Exception {
+        // start mock fluentd
+        int port = MockFluentd.randomPort(); // Use a random port available
+        final List<Event> elist = new ArrayList<Event>();
+        MockFluentd fluentd = new MockFluentd(port, new MockFluentd.MockProcess() {
+            public void process(MessagePack msgpack, Socket socket) throws IOException {
+                BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
+                try {
+                    Unpacker unpacker = msgpack.createUnpacker(in);
+                    while (true) {
+                        Event e = unpacker.read(Event.class);
+                        elist.add(e);
+                    }
+                    //socket.close();
+                } catch (EOFException e) {
+                    // ignore
+                }
+            }
+        });
+        fluentd.start();
+
+        // start asyncSenders
+        Sender asyncSender = new AsyncRawSocketSender("localhost", port);
+        int count = 10000;
+        for (int i = 0; i < count; i++) {
+            String tag = "tag:i";
+            Map<String, Object> record = new HashMap<String, Object>();
+            record.put("i", i);
+            record.put("n", "name:" + i);
+            asyncSender.emit(tag, record);
+        }
+
+        // close asyncSender sockets
+        asyncSender.close();
+
+        // wait for unpacking event data on fluentd
+        Thread.sleep(2000);
+
+        // close mock server sockets
+        fluentd.close();
+
+
+        // check data
+        assertEquals(count, elist.size());
+    }
+
+    @Test
+    public void testNormal03() throws Exception {
+        // start mock fluentds
+        final MockFluentd[] fluentds = new MockFluentd[2];
+        final List[] elists = new List[2];
+        final int[] ports = new int[2];
+        ports[0] = MockFluentd.randomPort();
+        AsyncRawSocketSender asyncRawSocketSender = new AsyncRawSocketSender("localhost", ports[0]);   // it should be failed to connect to fluentd
+        elists[0] = new ArrayList<Event>();
+        fluentds[0] = new MockFluentd(ports[0], new MockFluentd.MockProcess() {
+            public void process(MessagePack msgpack, Socket socket) throws IOException {
+                BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
+                try {
+                    Unpacker unpacker = msgpack.createUnpacker(in);
+                    while (true) {
+                        Event e = unpacker.read(Event.class);
+                        elists[0].add(e);
+                    }
+                    //socket.close();
+                } catch (EOFException e) {
+                    // ignore
+                }
+            }
+        });
+        fluentds[0].start();
+        ports[1] = MockFluentd.randomPort();
+        elists[1] = new ArrayList<Event>();
+        fluentds[1] = new MockFluentd(ports[1], new MockFluentd.MockProcess() {
+            public void process(MessagePack msgpack, Socket socket) throws IOException {
+                BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
+                try {
+                    Unpacker unpacker = msgpack.createUnpacker(in);
+                    while (true) {
+                        Event e = unpacker.read(Event.class);
+                        elists[1].add(e);
+                    }
+                    //socket.close();
+                } catch (EOFException e) {
+                    // ignore
+                }
+            }
+        });
+        fluentds[1].start();
+
+        // start AsyncSenders
+        Sender[] asyncSenders = new Sender[2];
+        int[] counts = new int[2];
+        asyncSenders[0] = asyncRawSocketSender;
+        counts[0] = 10000;
+        for (int i = 0; i < counts[0]; i++) {
+            String tag = "tag:i";
+            Map<String, Object> record = new HashMap<String, Object>();
+            record.put("i", i);
+            record.put("n", "name:" + i);
+            asyncSenders[0].emit(tag, record);
+        }
+        asyncSenders[1] = new AsyncRawSocketSender("localhost", ports[1]);
+        counts[1] = 10000;
+        for (int i = 0; i < counts[1]; i++) {
+            String tag = "tag:i";
+            Map<String, Object> record = new HashMap<String, Object>();
+            record.put("i", i);
+            record.put("n", "name:" + i);
+            asyncSenders[1].emit(tag, record);
+        }
+
+        // close sender sockets
+        asyncSenders[0].close();
+        asyncSenders[1].close();
+
+        // wait for unpacking event data on fluentd
+        Thread.sleep(2000);
+
+        // close mock server sockets
+        fluentds[0].close();
+        fluentds[1].close();
+
+
+        // check data
+        assertEquals(counts[0], elists[0].size());
+        assertEquals(counts[1], elists[1].size());
+    }
+
+    @Test
+    public void testTimeout() throws InterruptedException {
+        final AtomicBoolean socketFinished = new AtomicBoolean(false);
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+
+        executor.execute(new Runnable() {
+            @Override
+            public void run() {
+                AsyncRawSocketSender asyncRawSocketSender = null;
+                try {
+                    // try to connect to test network
+                    asyncRawSocketSender = new AsyncRawSocketSender("192.0.2.1", 24224, 200, 8 * 1024);
+                }
+                finally {
+                    if (asyncRawSocketSender != null) {
+                        asyncRawSocketSender.close();
+                    }
+                    socketFinished.set(true);
+                }
+            }
+        });
+
+        while(!socketFinished.get())
+            Thread.yield();
+
+        assertTrue(socketFinished.get());
+        executor.shutdownNow();
+    }
+}