Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
TDD in iOS
Search
Dominik Hauser
December 04, 2019
Programming
0
47
TDD in iOS
German presentation about TDD in iOS
Dominik Hauser
December 04, 2019
Tweet
Share
Other Decks in Programming
See All in Programming
RailsGirls IZUMO スポンサーLT
16bitidol
0
180
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
1
10k
Azure AI Foundryではじめてのマルチエージェントワークフロー
seosoft
0
170
AIエージェントはこう育てる - GitHub Copilot Agentとチームの共進化サイクル
koboriakira
0
590
レベル1の開発生産性向上に取り組む − 日々の作業の効率化・自動化を通じた改善活動
kesoji
0
220
イベントストーミング図からコードへの変換手順 / Procedure for Converting Event Storming Diagrams to Code
nrslib
2
820
Rails Frontend Evolution: It Was a Setup All Along
skryukov
0
140
Modern Angular with Signals and Signal Store:New Rules for Your Architecture @enterJS Advanced Angular Day 2025
manfredsteyer
PRO
0
220
チームのテスト力を総合的に鍛えて品質、スピード、レジリエンスを共立させる/Testing approach that improves quality, speed, and resilience
goyoki
5
880
Webの外へ飛び出せ NativePHPが切り拓くPHPの未来
takuyakatsusa
2
550
PostgreSQLのRow Level SecurityをPHPのORMで扱う Eloquent vs Doctrine #phpcon #track2
77web
2
530
Hypervel - A Coroutine Framework for Laravel Artisans
albertcht
1
130
Featured
See All Featured
Rebuilding a faster, lazier Slack
samanthasiow
82
9.1k
Code Review Best Practice
trishagee
69
18k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
48
2.9k
Testing 201, or: Great Expectations
jmmastey
43
7.6k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
Building Adaptive Systems
keathley
43
2.7k
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.3k
Producing Creativity
orderedlist
PRO
346
40k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
950
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
Transcript
TDD und iOS Dominik Hauser, @dasdom
The quality and performance achieved could not have been done
without the use of unit testing. — Bill Bumgarner (bbum), über Core Data 1.0
Vorteile
Vorteile1 · Refaktorierbarkeit · Schnelles Feedback · Gedankenstütze · Doppelte
Buchführung · Regressionsschutz 1 Von (subjektiv) wichtig nach unwichtig
Planning/Feedback Loops Release Plan Code Iteration Plan Acceptance Test Stand
Up Meeting Pair Negotiation Unit Test Pair Programming Months Weeks Days One day Hours Minutes Seconds DonWells (CC BY-SA 3.0)
Wie? Red Green Refactor
Warum so wenig Tests?
"Was soll denn da kaputt gehen?"
if index-1 < userNames.count { nameLabel.text = userNames[index] } else
{ nameLabel.text = "Unknown" }
if index-1 < userNames.count { nameLabel.text = userNames[index] } else
{ nameLabel.text = "Unknown" }
class TableViewCell: UITableViewCell { let label = UILabel() override init(style:
UITableViewCell.CellStyle, reuseIdentifier: String?) { super.init(style: style, reuseIdentifier: reuseIdentifier) addSubview(label) } }
class TableViewCell: UITableViewCell { let label = UILabel() override init(style:
UITableViewCell.CellStyle, reuseIdentifier: String?) { super.init(style: style, reuseIdentifier: reuseIdentifier) addSubview(label) } }
"Was soll denn da kaputt gehen?" 1. That can’t happen.
2. That doesn’t happen on my machine. 3. That shouldn’t happen. 4. Why does that happen? 5. Oh, I see. 6. How did that ever work?2 2 Mike W. Cremer
"Machen wir nach dem Release."
RELEASE 1.0 TESTS RELEASE 1.1 Login Login Tests User User
Tests Logout Logout Tests Password reset Password Tests Blocking of users Blocking tests ... ...
RELEASE 1.0 RELEASE 1.1 TESTS Login Login Tests User User
Tests Logout Logout Tests Password reset Password Tests Blocking of users Blocking tests ... ...
RELEASE 1.0 RELEASE 1.1 RELEASE 1.1.1 Login User Logout Password
reset Blocking of users ... ...
Nach den Release ist vor den Release
"UI kann man nicht testen."
func test_viewHasLabel() { sut.loadViewIfNeeded() XCTAssertTrue(sut.label.isDescendant(of: sut.view)) }
func test_loadingView_registersCell() { // when sut.loadViewIfNeeded() // then let cell
= sut.tableView.dequeueReusableCell( withIdentifier: "Cell", for: IndexPath(row: 0, section: 0)) XCTAssertNotNil(cell) XCTAssertTrue(cell is Cell) }
func test_showNext_pushesViewController() { // given let navControllerMock = NavigationControllerMock( rootViewController:
sut) let user = User(name: "Foobar") // when sut.showNext(with: user) // then let detailController = navControllerMock.lastPushedVC as! DetailViewController XCTAssertEqual(detailController.user, user) }
"UI kann man nicht testen." Kann man
Tips & Tricks
Dependency Injection (Inversion of Control)
Zum Beispiel: Constructor Injection let defaultsStub = DefaultsStub(boolToReturn: false) let
user = User(defaults: defaultsStub)
Ausserdem · Constructor Injection · Setter Injection · Interface Injection
Abstraktion
Abstraktion Beispiel: Alerts protocol Alerter { func presentOKAlert(on: UIViewController, title:
String, message: String, okAction: ()->Void) }
View laden func test_foo() { // given ... // when
view loads sut.loadViewIfNeeded() // then ... }
viewWill/DidAppear func test_foo() { // given ... // when view
appears sut.beginAppearanceTransition(true, animated: false) sut.endAppearanceTransition() // then ... }
Modal presentation func test_presentationOfViewController() { // given let window =
UIWindow(frame: CGRect(x: 0, y: 0, width: 300, height: 300)) window.rootViewController = sut window.makeKeyAndVisible() // when sut.showNext() // then XCTAssertTrue(sut.presentedViewController is DetailViewController) }
Bestehender Code Wie anfangen?
Bug ➜ Test
Neues Feature ➜ Test
pragprog.com/book/jrlegios/ ios-unit-testing-by-example
Promolink http://leanpub.com/ tdd_ios_gimme_the_cod e/c/macdev
None
Promolink http://leanpub.com/ tdd_ios_gimme_the_cod e/c/macdev
Ende
Ende!
None