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
DC London: Composing With Confidence
Search
Adam McNeilly
October 27, 2022
Programming
0
270
DC London: Composing With Confidence
Another version of Composing With Confidence, this time presented at Droidcon London.
Adam McNeilly
October 27, 2022
Tweet
Share
More Decks by Adam McNeilly
See All by Adam McNeilly
MVWTF 2024: Demystifying Architecture Patterns
adammc331
1
270
The Unyielding Spirit Of Android - Droidcon NYC '23
adammc331
1
330
DC London: Behind The Screen
adammc331
0
23
Composing With Confidence
adammc331
1
150
The Imposter's Guide To Dependency Injection - DCSF22
adammc331
2
330
Caching With Apollo Android
adammc331
0
350
Creating A Better Developer Experience By Avoiding Legacy Code
adammc331
0
530
Take Control Of Your APIs With GraphQL
adammc331
0
320
Droidcon London: Espresso Patronum
adammc331
0
300
Other Decks in Programming
See All in Programming
Amazon CloudWatchの地味だけど強力な機能紹介!
itotsum
0
230
設計の本質:コード、システム、そして組織へ / The Essence of Design: To Code, Systems, and Organizations
nrslib
10
3.7k
Instrumentsを使用した アプリのパフォーマンス向上方法
hinakko
0
230
On-the-fly Suggestions of Rewriting Method Deprecations
ohbarye
1
4.7k
AI時代の開発者評価について
ayumuu
0
230
2025-04-25 GitHub Copilot Agent ライブデモ(スクリプト)
goataka
0
100
Fiber Scheduler vs. General-Purpose Parallel Client
hayaokimura
1
290
サービスレベルを管理してアジャイルを加速しよう!! / slm-accelerate-agility
tomoyakitaura
1
200
実践Webフロントパフォーマンスチューニング
cp20
45
10k
Orleans + Sekiban + SignalR でリアルタイムWeb作ってみた
tomohisa
0
230
API for docs
soutaro
3
1.6k
The Evolution of the CRuby Build System
kateinoigakukun
1
760
Featured
See All Featured
Agile that works and the tools we love
rasmusluckow
329
21k
Documentation Writing (for coders)
carmenintech
70
4.7k
StorybookのUI Testing Handbookを読んだ
zakiyama
29
5.7k
The Invisible Side of Design
smashingmag
299
50k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
129
19k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Building an army of robots
kneath
305
45k
KATA
mclloyd
29
14k
Product Roadmaps are Hard
iamctodd
PRO
52
11k
The Cost Of JavaScript in 2023
addyosmani
49
7.8k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
49k
Side Projects
sachag
453
42k
Transcript
Composing With Confidence Adam McNeilly - @AdamMc331 @AdamMc331 #DCLDN22 1
Testing Is Important @AdamMc331 #DCLDN22 2
With New Tools Comes New Responsibilities @AdamMc331 #DCLDN22 3
Getting Started With Compose Testing1 1 https://goo.gle/compose-testing @AdamMc331 #DCLDN22 4
Two Options For Compose Testing @AdamMc331 #DCLDN22 5
Two Options For Compose Testing • Individual components @AdamMc331 #DCLDN22
5
Two Options For Compose Testing • Individual components • Activities
@AdamMc331 #DCLDN22 5
Compose Rule Setup class PrimaryButtonTest { // When testing individual
components, we can just create a compose rule. @get:Rule val composeTestRule = createComposeRule() } @AdamMc331 #DCLDN22 6
Compose Rule Setup class PrimaryButtonTest { // When testing individual
components, we can just create a compose rule. @get:Rule val composeTestRule = createComposeRule() // When testing activities, use androidComposeRule. @get:Rule val composeTestRule = createAndroidComposeRule<MainActivity>() } @AdamMc331 #DCLDN22 7
Rendering Content class PrimaryButtonTest { // ... @Test fun renderEnabledButton()
{ composeTestRule.setContent { PrimaryButton( text = "Test Button", enabled = true, ) } } } @AdamMc331 #DCLDN22 8
Test Recipe // Find component composeTestRule.onNodeWithText("Test Button") // Make assertion
composeTestRule.onNodeWithText("Test Button") .assertIsEnabled() // Perform action composeTestRule.onNodeWithText("Test Button") .performClick() @AdamMc331 #DCLDN22 9
Test Recipe // Find component composeTestRule.onNodeWithText("Test Button") // Make assertion
composeTestRule.onNodeWithText("Test Button") .assertIsEnabled() // Perform action composeTestRule.onNodeWithText("Test Button") .performClick() @AdamMc331 #DCLDN22 9
Test Recipe // Find component composeTestRule.onNodeWithText("Test Button") // Make assertion
composeTestRule.onNodeWithText("Test Button") .assertIsEnabled() // Perform action composeTestRule.onNodeWithText("Test Button") .performClick() @AdamMc331 #DCLDN22 9
Finding Components @AdamMc331 #DCLDN22 10
Finding Components composeTestRule.onNode(matcher) composeTestRule.onNode(hasProgressBarRangeInfo(...)) composeTestRule.onNode(isDialog()) @AdamMc331 #DCLDN22 11
Finding Components composeTestRule.onNode(matcher) composeTestRule.onNode(hasProgressBarRangeInfo(...)) composeTestRule.onNode(isDialog()) // Helpers composeTestRule.onNodeWithText("...") // Multiple
composeTestRule.onAllNodes(...) @AdamMc331 #DCLDN22 12
Making Assertions @AdamMc331 #DCLDN22 13
Making Assertions composeTestRule .onNode(...) .assert(matcher) composeTestRule .onNode(...) .assert(hasText("Test Button")) composeTestRule
.onNode(...) .assert(isEnabled()) @AdamMc331 #DCLDN22 14
Making Assertions composeTestRule .onNode(...) .assert(matcher) // Helpers composeTestRule .onNode(...) .assertTextEquals("Test
Button") @AdamMc331 #DCLDN22 15
Performing Actions @AdamMc331 #DCLDN22 16
Performing Actions composeTestRule .onNode(...) .performClick() composeTestRule .onNode(...) .performTextInput(...) @AdamMc331 #DCLDN22
17
Cheat Sheet2 2 https://developer.android.com/static/images/jetpack/compose/compose-testing-cheatsheet.png @AdamMc331 #DCLDN22 18
Test Tags @AdamMc331 #DCLDN22 19
Test Tags // In app PrimaryButton( modifier = Modifier.testTag("login_button") )
// In test composeTestRule.onNodeWithTag("login_button") @AdamMc331 #DCLDN22 20
Let's Test A Component @AdamMc331 #DCLDN22 21
Primary Button @Composable fun PrimaryButton( text: String, onClick: () ->
Unit, enabled: Boolean = true, ) @AdamMc331 #DCLDN22 22
Primary Button @Composable fun PrimaryButton( text: String, onClick: () ->
Unit, enabled: Boolean = true, ) @AdamMc331 #DCLDN22 22
Setup @RunWith(AndroidJUnit4::class) class PrimaryButtonTest { @get:Rule val composeTestRule = createComposeRule()
@Test fun handleClickWhenEnabled() { // ... } } @AdamMc331 #DCLDN22 23
Render Content var wasClicked = false composeTestRule.setContent { PrimaryButton( text
= "Test Button", onClick = { wasClicked = true }, enabled = true, ) } @AdamMc331 #DCLDN22 24
Verify Behavior composeTestRule .onNodeWithText("Test Button") .performClick() assertTrue(wasClicked) @AdamMc331 #DCLDN22 25
A Bigger Component @AdamMc331 #DCLDN22 26
@AdamMc331 #DCLDN22 27
@AdamMc331 #DCLDN22 28
Test Setup @Test fun renderBlueWinner() { composeTestRule.setContent { PocketLeagueTheme {
MatchCard( match = MatchDetailDisplayModel.blueWinner, ) } } } @AdamMc331 #DCLDN22 29
@AdamMc331 #DCLDN22 30
Trophy Icon? @AdamMc331 #DCLDN22 31
Let's Debug @Test fun renderBlueWinner() { composeTestRule.setContent { ... }
composeTestRule.onRoot().printToLog(tag = "BLUE_WINNER") } @AdamMc331 #DCLDN22 32
Debug Output printToLog: Printing with useUnmergedTree = 'false' Node #1
at (l=0.0, t=237.0, r=1080.0, b=609.0)px |-Node #2 at (l=0.0, t=237.0, r=1080.0, b=609.0)px // ... |-Node #6 at (l=115.0, t=436.0, r=332.0, b=495.0)px, Tag: 'blue_match_team_name' | Text = '[Knights [winner]]' | Actions = [GetTextLayoutResult] // ... @AdamMc331 #DCLDN22 33
Assertions @Test fun renderBlueWinner() { composeTestRule.setContent { ... } composeTestRule
.onNodeWithTag("blue_match_team_name") .assertTextEquals("Knights [winner]") composeTestRule .onNodeWithTag("orange_match_team_name") .assertTextEquals("G2 Esports") } @AdamMc331 #DCLDN22 34
Assertions @Test fun renderBlueWinner() { composeTestRule.setContent { ... } composeTestRule
.onNodeWithTag("blue_match_team_name") .assertTextEquals("Knights [winner]") composeTestRule .onNodeWithTag("orange_match_team_name") .assertTextEquals("G2 Esports") } @AdamMc331 #DCLDN22 34
Another Option @AdamMc331 #DCLDN22 35
36
37
Sample class MatchCardPaparazziTest { @get:Rule val paparazzi = Paparazzi() @Test
fun renderBlueTeamWinner() { paparazzi.snapshot { PocketLeagueTheme { MatchCard(match = MatchDetailDisplayModel.blueWinner) } } } } @AdamMc331 #DCLDN22 38
@AdamMc331 #DCLDN22 39
40
The Right Tool? @AdamMc331 #DCLDN22 41
The Right Tool? • Paparazzi has pixel perfect validation @AdamMc331
#DCLDN22 41
The Right Tool? • Paparazzi has pixel perfect validation •
Requires you to verfy snapshot @AdamMc331 #DCLDN22 41
The Right Tool? • Paparazzi has pixel perfect validation •
Requires you to verfy snapshot • Snapshots can change often @AdamMc331 #DCLDN22 41
When deciding how to test a component, consider functionality vs
rendering. @AdamMc331 #DCLDN22 42
Testing A Login Form @AdamMc331 #DCLDN22 43
@AdamMc331 #DCLDN22 44
Setup @RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val composeTestRule = createAndroidComposeRule<MainActivity>()
@Test fun successfulLogin() { // ... } } @AdamMc331 #DCLDN22 45
Verify Login Button Disabled composeTestRule .onNodeWithTag("login_button") .assertIsNotEnabled() @AdamMc331 #DCLDN22 46
Type Username composeTestRule .onNodeWithTag("username_text_field") .performTextInput("adammc331") @AdamMc331 #DCLDN22 47
Type Password composeTestRule .onNodeWithTag("password_text_field") .performTextInput("Hunter2") @AdamMc331 #DCLDN22 48
Verify Login Button Enabled composeTestRule .onNodeWithTag("login_button") .assertIsEnabled() @AdamMc331 #DCLDN22 49
Click Login Button composeTestRule .onNodeWithTag("login_button") .performClick() @AdamMc331 #DCLDN22 50
Verify Home Screen Displayed composeTestRule .onNodeWithTag("home_screen_label") .assertIsDisplayed() @AdamMc331 #DCLDN22 51
@Test fun successfulLogin() { composeTestRule .onNodeWithTag("login_button") .assertIsNotEnabled() composeTestRule .onNodeWithTag("username_text_field") .performTextInput("adammc331")
composeTestRule .onNodeWithTag("login_button") .assertIsNotEnabled() composeTestRule .onNodeWithTag("password_text_field") .performTextInput("Hunter2") composeTestRule .onNodeWithTag("login_button") .assertIsEnabled() composeTestRule .onNodeWithTag("login_button") .performClick() composeTestRule .onNodeWithTag("home_screen_label") .assertIsDisplayed() } @AdamMc331 #DCLDN22 52
Test Robots @AdamMc331 #DCLDN22 53
LoginScreenRobot class LoginScreenRobot( composeTestRule: ComposeTestRule, ) { private val usernameInput
= composeTestRule.onNodeWithTag("username_text_field") private val passwordInput = composeTestRule.onNodeWithTag("password_text_field") private val loginButton = composeTestRule.onNodeWithTag("login_button") } @AdamMc331 #DCLDN22 54
LoginScreenRobot class LoginScreenRobot { // ... fun enterUsername(username: String) {
usernameInput.performTextInput(username) } fun enterPassword(password: String) { passwordInput.performTextInput(password) } @AdamMc331 #DCLDN22 55
Kotlin Magic fun loginScreenRobot( composeTestRule: ComposeTestRule, block: LoginScreenRobot.() -> Unit,
) { val robot = LoginScreenRobot(composeTestRule) robot.invoke(block) } @AdamMc331 #DCLDN22 56
Kotlin Magic loginScreenRobot(composeTestRule) { verifyLoginButtonDisabled() enterUsername("adammc331") enterPassword("Hunter2") verifyLoginButtonEnabled() clickLoginButton() }
@AdamMc331 #DCLDN22 57
@Test fun successfulLogin() { loginScreenRobot(composeTestRule) { verifyLoginButtonDisabled() enterUsername("adammc331") enterPassword("Hunter2") verifyLoginButtonEnabled()
clickLoginButton() } homeScreenRobot(composeTestRule) { verifyLabelDisplayed() } } @AdamMc331 #DCLDN22 58
Project Links @AdamMc331 #DCLDN22 59
Project Links • https://github.com/adammc331/PocketLeague @AdamMc331 #DCLDN22 59
Project Links • https://github.com/adammc331/PocketLeague • https://github.com/adammc331/ComposingWithConfidence @AdamMc331 #DCLDN22 59