diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index 7a27c30..515bc45 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -55,6 +55,8 @@
 		7472A5EE1BB6ECE800CD4F59 /* WebSocket.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5764DF881B51F254004FF46E /* WebSocket.swift */; };
 		7472C65C1BCAB53E003CA70D /* SocketNamespacePacketTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7472C65B1BCAB53E003CA70D /* SocketNamespacePacketTest.swift */; settings = {ASSET_TAGS = (); }; };
 		7472C65D1BCAB53E003CA70D /* SocketNamespacePacketTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7472C65B1BCAB53E003CA70D /* SocketNamespacePacketTest.swift */; settings = {ASSET_TAGS = (); }; };
+		7472C65F1BCAC46E003CA70D /* SocketSideEffectTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7472C65E1BCAC46E003CA70D /* SocketSideEffectTest.swift */; settings = {ASSET_TAGS = (); }; };
+		7472C6601BCAC46E003CA70D /* SocketSideEffectTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7472C65E1BCAC46E003CA70D /* SocketSideEffectTest.swift */; settings = {ASSET_TAGS = (); }; };
 		74781D5A1B7E83930042CACA /* SocketIOClientStatus.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74781D591B7E83930042CACA /* SocketIOClientStatus.swift */; };
 		74781D5B1B7E83930042CACA /* SocketIOClientStatus.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74781D591B7E83930042CACA /* SocketIOClientStatus.swift */; };
 		74781D5C1B7E83930042CACA /* SocketIOClientStatus.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74781D591B7E83930042CACA /* SocketIOClientStatus.swift */; };
@@ -137,6 +139,7 @@
 		5764DF871B51F254004FF46E /* SwiftRegex.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = SwiftRegex.swift; path = SocketIOClientSwift/SwiftRegex.swift; sourceTree = "<group>"; };
 		5764DF881B51F254004FF46E /* WebSocket.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = WebSocket.swift; path = SocketIOClientSwift/WebSocket.swift; sourceTree = "<group>"; };
 		7472C65B1BCAB53E003CA70D /* SocketNamespacePacketTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SocketNamespacePacketTest.swift; sourceTree = "<group>"; };
+		7472C65E1BCAC46E003CA70D /* SocketSideEffectTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SocketSideEffectTest.swift; sourceTree = "<group>"; };
 		74781D591B7E83930042CACA /* SocketIOClientStatus.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = SocketIOClientStatus.swift; path = SocketIOClientSwift/SocketIOClientStatus.swift; sourceTree = "<group>"; };
 		749A7F8A1BA9D42D00782993 /* SocketAckEmitter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = SocketAckEmitter.swift; path = SocketIOClientSwift/SocketAckEmitter.swift; sourceTree = "<group>"; };
 		74D765611B9F0D870028551C /* SocketStringReader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = SocketStringReader.swift; path = SocketIOClientSwift/SocketStringReader.swift; sourceTree = "<group>"; };
@@ -262,6 +265,7 @@
 				74F124EF1BC574CF002966F4 /* SocketBasicPacketTest.swift */,
 				7472C65B1BCAB53E003CA70D /* SocketNamespacePacketTest.swift */,
 				949FAE8C1B9B94E600073BE9 /* SocketParserTest.swift */,
+				7472C65E1BCAC46E003CA70D /* SocketSideEffectTest.swift */,
 				74F124EC1BC572A8002966F4 /* SocketTestEngine.swift */,
 				572EF2471B51F18A00EEBB58 /* Supporting Files */,
 			);
@@ -507,6 +511,7 @@
 				749A7F8C1BA9D42D00782993 /* SocketAckEmitter.swift in Sources */,
 				74F124ED1BC572A8002966F4 /* SocketTestEngine.swift in Sources */,
 				945B65371B5FCEEA0081E995 /* SocketEngine.swift in Sources */,
+				7472C65F1BCAC46E003CA70D /* SocketSideEffectTest.swift in Sources */,
 				945B65351B5FCEEA0081E995 /* SocketAckManager.swift in Sources */,
 				945B65401B5FCEEA0081E995 /* SwiftRegex.swift in Sources */,
 				945B653C1B5FCEEA0081E995 /* SocketLogger.swift in Sources */,
@@ -562,6 +567,7 @@
 				7472A5E51BB6ECE800CD4F59 /* SocketEventHandler.swift in Sources */,
 				74F124EE1BC572A8002966F4 /* SocketTestEngine.swift in Sources */,
 				7472A5E61BB6ECE800CD4F59 /* SocketFixUTF8.swift in Sources */,
+				7472C6601BCAC46E003CA70D /* SocketSideEffectTest.swift in Sources */,
 				7472A5E71BB6ECE800CD4F59 /* SocketIOClient.swift in Sources */,
 				7472A5E81BB6ECE800CD4F59 /* SocketLogger.swift in Sources */,
 				7472A5E91BB6ECE800CD4F59 /* SocketPacket.swift in Sources */,
diff --git a/SocketIO-MacTests/SocketSideEffectTest.swift b/SocketIO-MacTests/SocketSideEffectTest.swift
new file mode 100644
index 0000000..d6af57c
--- /dev/null
+++ b/SocketIO-MacTests/SocketSideEffectTest.swift
@@ -0,0 +1,57 @@
+//
+//  SocketSideEffectTest.swift
+//  Socket.IO-Client-Swift
+//
+//  Created by Erik Little on 10/11/15.
+//
+//
+
+import XCTest
+
+class SocketSideEffectTest: XCTestCase {
+    private var socket: SocketIOClient!
+
+    override func setUp() {
+        super.setUp()
+        socket = SocketIOClient(socketURL: "")
+        socket.setTestable()
+    }
+    
+    func testInitialCurrentAck() {
+        XCTAssertEqual(socket.currentAck, -1)
+    }
+    
+    func testFirstAck() {
+        socket.emitWithAck("test")(timeoutAfter: 0) {data in}
+        XCTAssertEqual(socket.currentAck, 0)
+    }
+    
+    func testSecondAck() {
+        socket.emitWithAck("test")(timeoutAfter: 0) {data in}
+        socket.emitWithAck("test")(timeoutAfter: 0) {data in}
+
+        XCTAssertEqual(self.socket.currentAck, 1)
+    }
+    
+    func testHandleAck() {
+        let expectation = expectationWithDescription("handled ack")
+        socket.emitWithAck("test")(timeoutAfter: 0) {data in
+            XCTAssertEqual(data[0] as? String, "hello world")
+            expectation.fulfill()
+        }
+        
+        socket.handleAck(0, data: ["hello world"])
+        waitForExpectationsWithTimeout(3, handler: nil)
+    }
+    
+    func testHandleEvent() {
+        let expectation = expectationWithDescription("handled event")
+        socket.on("test") {data, ack in
+            XCTAssertEqual(data[0] as? String, "hello world")
+            expectation.fulfill()
+        }
+        
+        socket.parseSocketMessage("2[\"test\",\"hello world\"]")
+        waitForExpectationsWithTimeout(3, handler: nil)
+    }
+}
diff --git a/SocketIO-MacTests/SocketTestEngine.swift b/SocketIO-MacTests/SocketTestEngine.swift
index 1bf75d7..af476fa 100644
--- a/SocketIO-MacTests/SocketTestEngine.swift
+++ b/SocketIO-MacTests/SocketTestEngine.swift
@@ -80,7 +80,6 @@ class SocketTestEngine: NSObject, SocketEngineSpec {
                 expectation?.fulfill()
                 return true
         } else {
-            print(sendString)
             return false
         }
     }
diff --git a/SocketIO-iOSTests/SocketParserTest.swift b/SocketIO-iOSTests/SocketParserTest.swift
index 0e42f6f..bb94f16 100644
--- a/SocketIO-iOSTests/SocketParserTest.swift
+++ b/SocketIO-iOSTests/SocketParserTest.swift
@@ -13,6 +13,7 @@ class SocketParserTest: XCTestCase {
     //Format key: message; namespace-data-binary-id
     static let packetTypes: Dictionary<String, (String, [AnyObject], [NSData], Int)> = [
         "0": ("/", [], [], -1), "1": ("/", [], [], -1),
+        "25[\"test\"]": ("/", ["test"], [], 5),
         "2/swift,[\"testArrayEmitReturn\",[\"test3\",\"test4\"]]": ("/swift", ["testArrayEmitReturn", ["test3", "test4"]], [], -1),
         "51-/swift,[\"testMultipleItemsWithBufferEmitReturn\",[1,2],{\"test\":\"bob\"},25,\"polo\",{\"_placeholder\":true,\"num\":0}]": ("/swift", ["testMultipleItemsWithBufferEmitReturn", [1, 2], ["test": "bob"], 25, "polo", "~~0"], [], -1),
         "3/swift,0[[\"test3\",\"test4\"]]": ("/swift", [["test3", "test4"]], [], 0),
@@ -43,6 +44,11 @@ class SocketParserTest: XCTestCase {
         validateParseResult(message)
     }
     
+    func testNamespaceEvent() {
+        let message = "25[\"test\"]"
+        validateParseResult(message)
+    }
+    
     func testNameSpaceArrayParse() {
         let message = "2/swift,[\"testArrayEmitReturn\",[\"test3\",\"test4\"]]"
         validateParseResult(message)
diff --git a/SocketIOClientSwift/SocketIOClient.swift b/SocketIOClientSwift/SocketIOClient.swift
index 0a7a15d..dc00c5e 100644
--- a/SocketIOClientSwift/SocketIOClient.swift
+++ b/SocketIOClientSwift/SocketIOClient.swift
@@ -50,8 +50,8 @@ public final class SocketIOClient: NSObject, SocketEngineClient {
     private var connectParams: [String: AnyObject]?
     private var reconnectTimer: NSTimer?
     private var ackHandlers = SocketAckManager()
-    private var currentAck = -1
-
+    
+    private(set) var currentAck = -1
     var waitingData = [SocketPacket]()
     
     /**