import UIKit
class ViewController: UIViewController {
 var actionString: String?
 @IBAction func showAlert(sender: UIButton) {
  let alertViewController = UIAlertController(title: "Test Title", message: "Message", preferredStyle: .Alert)
  let okAction = UIAlertAction(title: "OK", style: .Default) { (action) -> Void in
   self.actionString = "OK"
  }
  let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) -> Void in
   self.actionString = "Cancel"
  }
  alertViewController.addAction(cancelAction)
  alertViewController.addAction(okAction)
  presentViewController(alertViewController, animated: true, completion: nil)
 }
}

import XCTest
@testable import TestingAlertExperiment
class TestingAlertExperimentTests: XCTestCase {
 var sut: ViewController!
 override func setUp() {
  super.setUp()
  sut = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController() as! ViewController
  UIApplication.sharedApplication().keyWindow?.rootViewController = sut
 }
 override func tearDown() {
  // Put teardown code here. This method is called after the invocation of each test method in the class.
  super.tearDown()
 }
}
```

```Swift
func testAlert_HasTitle() {
 sut.showAlert(UIButton())
 XCTAssertTrue(sut.presentedViewController is UIAlertController)
 XCTAssertEqual(sut.presentedViewController?.title, "Test Title")
}
``` 

```Swift
class MockAlertAction : UIAlertAction {
 typealias Handler = ((UIAlertAction) -> Void)
 var handler: Handler?
 var mockTitle: String?
 var mockStyle: UIAlertActionStyle
 convenience init(title: String?, style: UIAlertActionStyle, handler: ((UIAlertAction) -> Void)?) {
  self.init()
  mockTitle = title
  mockStyle = style
  self.handler = handler
 }
 override init() {
  mockStyle = .Default
  super.init()
 }
}

import UIKit
class ViewController: UIViewController {
 var Action = UIAlertAction.self
 var actionString: String?
 @IBAction func showAlert(sender: UIButton) {
  let alertViewController = UIAlertController(title: "Test Title", message: "Message", preferredStyle: .Alert)
  let okAction = Action.init(title: "OK", style: .Default) { (action) -> Void in
   self.actionString = "OK"
  }
  let cancelAction = Action.init(title: "Cancel", style: .Cancel) { (action) -> Void in
   self.actionString = "Cancel"
  }
  alertViewController.addAction(cancelAction)
  alertViewController.addAction(okAction)
  presentViewController(alertViewController, animated: true, completion: nil)
 }
}

```

```Swift
func testAlert_FirstActionStoresCancel() {
 sut.Action = MockAlertAction.self
 sut.showAlert(UIButton())
 let alertController = sut.presentedViewController as! UIAlertController
 let action = alertController.actions.first as! MockAlertAction
 action.handler!(action)
 XCTAssertEqual(sut.actionString, "Cancel")
}