Your First iOS & SwiftUI App: An App from Scratch

Feb 13 2023 Swift 5.7, iOS 16, Xcode 14

Part 3: Coding in Swift

22. Intro to Unit Testing

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Previous episode: 21. The Swift Standard Library Next episode: 23. Intro to Test-Driven Development

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This video Intro to Unit Testing was last updated on Feb 13 2023

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Like it or not, almost every program you’ll ever write will have bugs. It happens even to the best programmers. It’s just human nature - we’re imperfect!

Add Unit Testing

Alright so we want to add some unit tests to Bullseye here.

Add Tests

And then what we’re going to do here is, here’s the set up with error. Which as we discussed is where you do your initial setup for all of your tests.

class BullseyeTests: XCTestCase {
  var game: Game!
  override func setUpWithError() throws {
    game = Game()
import XCTest
@testable import Bullseye
override func tearDownWithError() throws {
  game = nil
func testExample() throws {
  XCTAssertEqual(game.points(sliderValue: 50), 999)

Run the tests

Now that we have our test, there’s three ways that we can run this.