誰能給我一個關於 iOS Swift 單元測試的例子？

Question

我是 iOS 開發新手，想學習單元測試。 我想使用文本字段添加兩個數字，並在單擊操作時在標簽中顯示結果。 誰能建議我如何為此進行單元測試？

Answer 1

這是一個簡短的示例，但您應該始終嘗試多種不同的變體，就好像它是文本而不是數字和負數、高於 int 的數字等......

class AddingViewController: UIViewController {

    var sum = 0

    let textField1 = UITextField()
    let textField2 = UITextField()
    let button = UIButton()
    override func viewDidLoad() {
        super.viewDidLoad()
        button.addTarget(self, action: #selector(addNumbers), for: .touchUpInside)
    }

    @objc func addNumbers() {
        guard let number1 = Int(textField1.text!), let number2 = Int(textField2.text!) else {
            return
        }
        sum = number1 + number2
    }
}

class TestAddingViewController {

    let vc = AddingViewController()

    func testAddNumbers() {
        let number1 = 1
        let number2 = 2
        let sum = number1 + number2
        vc.textField1.text = "\(number1)"
        vc.textField2.text = "\(number2)"
        vc.button.sendActions(for: .touchUpInside)
        XCTAssertEqual(sum, vc.sum)
    }
}

如果 viewController 來自情節提要，您可以像通常調用情​​節提要一樣調用它

let storyboard = UIStoryboard(name: "MyStoryboardName", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "someViewController")

文本字段+按鈕將是@outlets ，按鈕動作將是@IBAction而不是@objc func

Answer 2

這是我的視圖控制器類：

import UIKit

class ViewController: UIViewController {

   // MARK: ▼▼▼ IBOutlets ▼▼▼
   @IBOutlet weak var lblAnswer: UILabel!

   // MARK: ▼▼▼ Lifecycle methods ▼▼▼
   override func viewDidLoad() {
      super.viewDidLoad()
      lblAnswer.text = "\(calculateSum(num1: 5, num2: 10))"
   }

   // MARK: ▼▼▼ Methods ▼▼▼
   func calculateSum(num1: Int, num2: Int) -> Int {
      return (num1 + num2)
   }
}

對於單元測試類，我有：

import XCTest
@testable import Test

class TestTests: XCTestCase {

// MARK: ▼▼▼ Variables ▼▼▼
var num1: Int?
var num2: Int?
var testClass: ViewController?

// This is used to initialise your code:
override func setUp() {
    testClass = ViewController()
    num1 = 10
    num2 = 10
}

// This runs when test is complete:
override func tearDown() {
    testClass = nil
    num1 = nil
    num2 = nil
}

// Should begin with test so that it is recognised:
func testSumFunction() {
    let sum = testClass!.calculateSum(num1: num1!, num2: num2!)
    // The sum should be 20 for this to pass.
    XCTAssertTrue(sum == 20)
}
}

如果函數的邏輯被改變並且 answer 不等於 20 那么這個測試將失敗。