danielCarlosCE

protocol CodeReader {
  func startReading(completion: @escaping (String) -> Void)
  func stopReading()
  var videoPreview: CALayer {get}
}

danielCarlosCE

extension AVCodeReader: CodeReader {
    func startReading(completion: @escaping (String) -> Void) {
        self.didRead = completion
        captureSession?.startRunning()
    }
    func stopReading() {
        captureSession?.stopRunning()
    }
}

danielCarlosCE

override func setUp() {
    super.setUp()
    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
    readerVC = mainStoryboard.instantiateViewController(withIdentifier: "ReaderViewController") as! ReaderViewController

    readerVC.dataSource = MockDataSource()
    readerVC.codeReader = mockReader
    
    //force the life cycle to be called
    let window = UIApplication.shared.delegate!.window!

danielCarlosCE

class ReaderViewController: UIViewController {

    @IBOutlet weak var videoPreview: UIView!
    private var videoLayer: CALayer!
    
    var codeReader: CodeReader!

    override func viewDidLoad() {
        videoLayer = codeReader.videoPreview
        videoPreview.layer.addSublayer(videoLayer)

danielCarlosCE

    private func isCodeInLimitBounds(codeReadable: AVMetadataMachineReadableCodeObject) -> Bool {

        if  let videoLayer = previewLayer as? AVCaptureVideoPreviewLayer,
            let transformedObj = videoLayer.transformedMetadataObject(for: codeReadable),
            let limitBounds = limitBounds {
            return limitBounds.contains(transformedObj.bounds)
        }
        //ignore 'failure' above
        return true
    }

danielCarlosCE

enum Result<T> {
    case success(T)
    case failure(Error)
}

protocol PlacePicker {
    func pick(result: @escaping (Result<Place>) -> Void)
}

protocol Place {

danielCarlosCE

func testPrepareForSegueDoesSetDestination() {
    let destination = storyBoard.instantiateViewController(withIdentifier: "InputVC") as! ViewController2
    let segue = UIStoryboardSegue(identifier: "addExpense", source: sut, destination: destination)

    sut.prepare(for: segue, sender: nil)

    XCTAssertNotNil(destination.completion)
    XCTAssertEqual(destination.type, .expense)
}

danielCarlosCE

private extension XCTestCase {
    func XCTAssertThrows<T, E>(_ expression: @autoclosure () throws -> T, specificError: E) where E: Error, E: Equatable  {

        XCTAssertThrowsError(try expression()) { error in
            XCTAssertEqual(error as? E, specificError)
        }

    }
}

danielCarlosCE

import UIKit
import PlaygroundSupport


var str = "Hello, playground"
let view = UIView(frame: CGRect(x: 0, y: 0, width: 600, height: 600))
view.backgroundColor = .red
let bottomLabel = UILabel()
bottomLabel.text = "Hello world!"
bottomLabel.sizeToFit()

danielCarlosCE

import UIKit


//MARK: Common
enum Result<T> {
    case success(T)
    case failure(Error)
}
struct Task {
    var title: String