add emitwithack tests

SocketIO-MacTests/SocketBasicEmitTest.swift

@@ -94,4 +94,43 @@ class SocketBasicEmitTest: XCTestCase {
         socket.emitTest("test", ["data1": data, "data2": data2])
         XCTAssert(engine.socketDidCorrectlyCreatePacket())
     }
+    
+    func testEmitWithAck() {
+        let engine = SocketTestEngine(client: socket,
+            expectedSendString: "20[\"test\"]",
+            expectedNumberOfBinary: 0,
+            expectedBinary: nil)
+        
+        engine.expectation = expectationWithDescription("emitWithAck")
+        socket.setTestEngine(engine)
+        socket.emitWithAck("test")(timeoutAfter: 0) {data in
+            engine.socketDidCorrectlyCreatePacket()
+        }
+
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 10000), dispatch_get_main_queue()) {
+            self.socket.parseSocketMessage("30[]")
+        }
+        
+        waitForExpectationsWithTimeout(2, handler: nil)
+    }
+    
+    func testEmitDataWithAck() {
+        let data = "test".dataUsingEncoding(NSUTF8StringEncoding)!
+        let engine = SocketTestEngine(client: socket,
+            expectedSendString: "51-0[\"test\",{\"num\":0,\"_placeholder\":true}]",
+            expectedNumberOfBinary: 1,
+            expectedBinary: [data])
+        
+        engine.expectation = expectationWithDescription("emitWithAck")
+        socket.setTestEngine(engine)
+        socket.emitWithAck("test", data)(timeoutAfter: 0) {data in
+            engine.socketDidCorrectlyCreatePacket()
+        }
+        
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 10000), dispatch_get_main_queue()) {
+            self.socket.parseSocketMessage("30[]")
+        }
+        
+        waitForExpectationsWithTimeout(3, handler: nil)
+    }
 }

SocketIO-MacTests/SocketTestEngine.swift

@@ -27,14 +27,15 @@
 // Test engine used to test SocketIOClient
 
 import Foundation
+import XCTest
 
 class SocketTestEngine: NSObject, SocketEngineSpec {
     private let expectedNumberOfBinary: Int
     private let expectedSendString: String
     private var expectedBinary: [NSData]?
     private var binary: [NSData]?
-    private var sendString: String!
-    private var numOfBinary: Int!
+    private var sendString = ""
+    private var numOfBinary = -1
     
     private(set) var sid = ""
     private(set) var cookies: [NSHTTPCookie]?
@@ -44,6 +45,7 @@ class SocketTestEngine: NSObject, SocketEngineSpec {
     private(set) var ws: WebSocket?
     
     weak var client: SocketEngineClient?
+    var expectation: XCTestExpectation?
     
     init(client: SocketIOClient, expectedSendString: String, expectedNumberOfBinary: Int, expectedBinary: [NSData]?) {
         self.client = client
@@ -72,9 +74,14 @@ class SocketTestEngine: NSObject, SocketEngineSpec {
     }
     
     func socketDidCorrectlyCreatePacket() -> Bool {
-        return expectedNumberOfBinary == numOfBinary
+        if expectedNumberOfBinary == numOfBinary
             && sendString == expectedSendString
-            && expectedBinary ?? [] == binary ?? []
+            && expectedBinary ?? [] == binary ?? [] {
+                expectation?.fulfill()
+                return true
+        } else {
+            return false
+        }
     }
     
     func write(msg: String, withType type: SocketEnginePacketType, withData data: [NSData]?) {}