diff --git a/src/test/java/com/corundumstudio/socketio/parser/DecoderJsonPacketTest.java b/src/test/java/com/corundumstudio/socketio/parser/DecoderJsonPacketTest.java
new file mode 100644
index 0000000..5033816
--- /dev/null
+++ b/src/test/java/com/corundumstudio/socketio/parser/DecoderJsonPacketTest.java
@@ -0,0 +1,32 @@
+package com.corundumstudio.socketio.parser;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.codehaus.jackson.map.ObjectMapper;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DecoderJsonPacketTest {
+
+	private final Decoder decoder = new Decoder(new ObjectMapper());
+	
+	@Test
+	public void testDecode() throws IOException {
+		Packet packet = decoder.decodePacket("4:::\"2\"");
+		Assert.assertEquals(PacketType.JSON, packet.getType());
+		Assert.assertEquals("2", packet.getData());
+	}
+
+	@Test
+	public void testDecodeWithMessageIdAndAckData() throws IOException {
+		Packet packet = decoder.decodePacket("4:1+::{\"a\":\"b\"}");
+		Assert.assertEquals(PacketType.JSON, packet.getType());
+		Assert.assertEquals("1", packet.getId());
+		Assert.assertEquals("data", packet.getAck());
+		Map obj = (Map) packet.getData();
+		Assert.assertEquals("b", obj.get("a"));
+		Assert.assertEquals(1, obj.size());
+	}
+	
+}