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DC London: Composing With Confidence
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Adam McNeilly
October 27, 2022
Programming
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250
DC London: Composing With Confidence
Another version of Composing With Confidence, this time presented at Droidcon London.
Adam McNeilly
October 27, 2022
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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