Modern Testing on Android

If you still test your apps manually, when will you have any time left to develop features? Android is present in so many flavors and devices, that relying solely on manual testing is practically an act of faith. Luckily, the testing landscape is also evolving so it's getting easier to implement a solid testing strategy.

In this talk we’ll cover the modern way of testing your Android application. We will outline the different types of tests and when to use which, show how to implement your tests using Jetpack Compose, discuss synchronization issues and how to solve them, and show how you can run your tests automatically using a Continuous Integration system.

Transcript

1. on Android Modern Testing Jolanda Verhoef Developer Relations Engineer Google she/her 
 @lojanda Jose Alcérreca Developer Relations Engineer Google he/him 
 @ppvi
2. Agenda ANSI/IEEE 1059 A process of a software item analyzing in order to detect the discrepancies between actual and required conditions (that is errors/bugs/defects) and to estimate the software item features. • Business process-based testing • Operational profile testing • Requirements-based testing • Incident management tools • Non-functional test design techniques • Glass box testing
3. Horror stories Modern Testing Strategies Regressions Manual QA Unit tests UI tests Screenshots Sync issues Using fakes Where to start
10. Horror story I
12. fun isValid(emailAddress: String): Boolean { return Pattern.compile( "(?:[a-z0-9!#\$%&'*+/=?^_`{|}~-]+" + "(?:\\.[a-z0-9!#\$%&'*+/=?^_`{|}~-]+)*" + "|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@" + "(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+" + "[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:" + "[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])" ).matcher(emailAddress).find() } Email validator
14. two months later...
15. Germany Spain UK Netherlands
16. Blimey! I can't log into the app. Rubbish. D. Turner July 6th, 2022
18. fun isValid(emailAddress: String): Boolean { return Pattern.compile( "(?:[a-z0-9!#\$%&'*+/=?^_`{|}~-]+" + "(?:\\.[a-z0-9!#\$%&'*+/=?^_`{|}~-]+)*" + "|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@" + "(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+" + "[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:" + "[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])" ).matcher(emailAddress).find() } Email validator fun isValid(emailAddress: String): Boolean { return Pattern.compile( "(?:[a-z0-9!#\$%&'*+/=?^_`{|}~-]+" + "(?:\\.[a-z0-9!#\$%&'*+/=?^_`{|}~-]+)*" + "|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@" + "(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+" + "[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}" + "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:" + "[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\" + "\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])" ).matcher(emailAddress).find() }
19. three days later...
20. 1 2 3 4 5 Jul 2 Jul 3 Jul 4 Jul 5 Jul 6 Google Play Rating
21. Can’t log in :( TJ Dahunsi July 9th, 2022
22. REGRESSION
23. Design Implementation QA Production Cost of a bug
24. class EmailValidatorTest { @Test fun emailAddress_default_isValid() { assertTrue(EmailValidator().isValid("person@example.com")) } @Test fun emailAddress_withDotsInLocalPart_isValid() { assertTrue(EmailValidator().isValid("p.e.r.s.o.n@example.com")) } @Test fun emailAddress_withoutDomain_isInvalid() { assertFalse(EmailValidator().isValid("person@example")) } }
25. class EmailValidatorTest { @Test fun emailAddress_default_isValid() { assertTrue(EmailValidator().isValid("person@example.com")) } @Test fun emailAddress_withDotsInLocalPart_isValid() { assertTrue(EmailValidator().isValid("p.e.r.s.o.n@example.com")) } @Test fun emailAddress_withoutDomain_isInvalid() { assertFalse(EmailValidator().isValid("person@example")) } @Test fun emailAddress_withMultiplePartsDomain_isValid() { assertTrue(EmailValidator().isValid("person@example.co.uk")) } }
26. Horror story II
34. OK Vale Bestätigung
36. Testing strategies
37. Local tests Instrumented tests vs
38. Local tests JVM Tests
39. Local tests JVM T
40. Instrumented tests Tests App code
41. Instrumented tests Tests App APK
42. Instrumented tests Tests APK Test APK
43. Instrumented tests Tests APK Test APK
44. Local Instrumented Smaller, faster Bigger, higher fidelity Integration tests Semantic UI tests Screenshot UI tests Performance tests Accessibility tests Unit tests
45. Local Instrumented Smaller, faster Bigger, higher fidelity Integration tests Semantic UI tests Screenshot UI tests Performance tests Accessibility tests Unit tests
46. Email validator App
47. Email validator Test: person@example person@example.co.uk person@example.com
48. class EmailValidatorTest { @Test fun emailAddress_default_isValid() { assertTrue(EmailValidator().isValid("person@example.com")) } }
49. class EmailValidatorTest { @Test fun emailAddress_default_isValid() { assertTrue(EmailValidator().isValid("person@example.com")) } @Test fun emailAddress_withDotsInLocalPart_isValid() { assertTrue(EmailValidator().isValid("p.e.r.s.o.n@example.com")) } @Test fun emailAddress_withoutDomain_isInvalid() { assertFalse(EmailValidator().isValid("person@example")) } @Test fun emailAddress_withMultiplePartsDomain_isValid() { assertTrue(EmailValidator().isValid("person@example.co.uk")) } }
50. Email validator App LoginViewModel
51. Email validator LoginViewModel
52. Email validator Fake Email validator LoginViewModel
53. Fakes or Mocks?
54. Email validator LoginViewModel Fake Email validator Test: Login is successful
55. class FakeEmailValidator(val alwaysValid: Boolean): EmailValidator { override fun isValid(emailAddress: String): Boolean { return alwaysValid } }
56. class LoginViewModelTest { @Test fun login_withValidEmail_returnsValidEmailUIState() { val viewModel = LoginViewModel( FakeEmailValidator(alwaysValid = true) ) } }
57. class LoginViewModelTest { @Test fun login_withValidEmail_returnsValidEmailUIState() { val viewModel = LoginViewModel( FakeEmailValidator(alwaysValid = true) ) viewModel.login(email = "whatevs", passwd = "hunter2") Assert.assertTrue(viewModel.uiState.validEmail) } }
58. App AuthManager
59. AuthManager
60. AuthManager
61. Fake Notification Manager? AuthManager
62. Robolectric ? AuthManager
63. Local Instrumented Smaller, faster Bigger, higher fidelity Semantic UI tests Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests
64. Local Instrumented Smaller, faster Bigger, higher fidelity Semantic UI tests Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests
65. App
66. App System under test Library
67. System under test Library
68. MainActivity Navigation Library
69. MainActivity Navigation Library Test Navigation Library
70. UserRepository Room in-memory DB MainActivity Navigation Library Test Navigation Library
71. d.android.com/kotlin/coroutines/test
72. API 27 3.19.4 API 28 3.22.0 API 30 3.28.0 API 33 3.32.2 Integration test: SQLite compatibility
73. Local Instrumented Smaller, faster Bigger, higher fidelity Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests
74. Local Instrumented Smaller, faster Bigger, higher fidelity Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests
75. Render UI
76. Render UI Validate properties is enabled
77. Render UI Interact Click! Validate properties
78. Render UI Validate properties Interact is disabled error shows
79. Render UI Validate properties Interact is disabled error shows
80. Small • Render part of UI • Verify properties Large • Render app • Verify properties • Interact • Verify properties • Interact • Verify properties • Interact • Verify properties Medium • Render one screen • Verify properties • Interact • Verify properties
81. Small • Render part of UI • Verify properties
82. Medium • Render one screen • Verify properties • Interact • Verify properties
83. Large • Render app • Verify properties • Interact • Verify properties • Interact • Verify properties • Interact • Verify properties
84. Compose View system test APIs Espresso
85. class LoginScreenTest { @get:Rule val composeTestRule = createComposeRule() @Test fun invalidEmail_disablesButton() { //.. } }
86. class LoginScreenTest { @get:Rule val composeTestRule = createComposeRule() @Test fun invalidEmail_disablesButton() { composeTestRule.setContent { MySootheTheme { LoginScreen() } } } }
87. val composeTestRule = createComposeRule() @Test fun invalidEmail_disablesButton() { composeTestRule.setContent { MySootheTheme { LoginScreen() } } composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() } }
88. composeTestRule.setContent { MySootheTheme { LoginScreen() } } composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() composeTestRule .onNodeWithText("Email address") .performTextInput("person@example") } }
89. } composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() composeTestRule .onNodeWithText("Email address") .performTextInput("person@example") composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled() } }
90. class LoginScreenTest { @get:Rule val composeTestRule = createComposeRule() @Test fun invalidEmail_disablesButton() { composeTestRule.setContent { MySootheTheme { LoginScreen() } } composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() // src/androidTest/java/com/example/soothe
91. class LoginScreenTest { @get:Rule val composeTestRule = createComposeRule() @Test fun invalidEmail_disablesButton() { composeTestRule.setContent { MySootheTheme { LoginScreen() } } composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() // src/test/java/com/example/soothe @RunWith(RobolectricTestRunner::class)
92. Local Instrumented Integration tests Performance tests Accessibility tests Semantic UI tests Screenshot UI tests Unit tests Smaller, faster Bigger, higher fidelity Robolectric Compose Test APIs Espresso
93. Local Instrumented Smaller, faster Bigger, higher fidelity Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests Screenshot UI tests
94. // Espresso onView(withBackgroundColor(Color.Red)).perform(click())
95. // Espresso onView(withBackgroundColor(Color.Red)).perform(click()) // Compose? onNode(hasBackgroundColor(Color.Red)).performClick()
96. @Composable fun MyCard() { Surface( color = Color.Red, modifier = Modifier.testTag("Green background") // Lies ) { } }
97. @Composable fun MyCard() { Surface( color = Color.Red, modifier = Modifier.testTag("Green background") // Lies ) { } } // LoginScreenTest.kt @Test fun loginButton_onStart_backgroundIsGreen() { composeTestRule.onNodeWithTag("Green background") }
98. @Composable fun MyCard() { Surface( color = Color.Red, modifier = Modifier.semantics { customBackgroundProperty = Color.Green // Lies } ) { } }
99. Button( onClick = {}, modifier = Modifier ) { Text("LOG IN") }
100. Button( onClick = {}, modifier = Modifier .fillMaxWidth() ) { Text("LOG IN") }
101. Golden screenshot New screenshot Difference
103. Local Instrumented Smaller, faster Bigger, higher fidelity Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests Compatibility testing
105. github.com/pedrovgs/Shot github.com/dropbox/dropshots
106. class TopicScreenScreenshotTests { @get:Rule val composeTestRule = createAndroidComposeRule<ComponentActivity>() @Test fun test1() { composeTestRule.setContent { LoginScreen() } } }
107. class TopicScreenScreenshotTests { @get:Rule val composeTestRule = createAndroidComposeRule<ComponentActivity>() @get:Rule val dropshots = Dropshots() @Test fun test1() { composeTestRule.setContent { LoginScreen() } } }
108. class TopicScreenScreenshotTests { @get:Rule val composeTestRule = createAndroidComposeRule<ComponentActivity>() @get:Rule val dropshots = Dropshots() @Test fun test1() { composeTestRule.setContent { LoginScreen() } dropshots.assertSnapshot(composeTestRule.activity, "test1") } }
109. Local Instrumented Smaller, faster Bigger, higher fidelity Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests Compatibility testing
110. Local Instrumented Smaller, faster Bigger, higher fidelity Screenshot UI tests Performance tests Accessibility tests Unit tests Integration tests Semantic UI tests Regression testing
111. github.com/cashapp/paparazzi/
112. Sync issues
113. Email validator App LoginViewModel
114. Email validator App LoginViewModel Server
116. @Test fun invalidEmail_disablesButton() { composeTestRule .onNodeWithText("LOG IN") .assertIsEnabled() composeTestRule .onNodeWithText("Email address") .performTextInput("person@example") composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled() } }
117. IDLE IDLE BUSY BUSY IDLE ?
118. 1. Idling Resources 2. Waiting for things 3. Replace components 1. Idling Resources class AuthRepository(val authService: AuthService) { suspend fun login(email: String, password: String) { authService.login(email, password) } }
119. 1. Idling Resources 2. Waiting for things 3. Replace components 1. Idling Resources class AuthRepository(val authService: AuthService) { private val idlingResource = SimpleIdlingResource() suspend fun login(email: String, password: String) { authService.login(email, password) } }
120. 1. Idling Resources 2. Waiting for things 3. Replace components 1. Idling Resources class AuthRepository(val authService: AuthService) { private val idlingResource = SimpleIdlingResource() suspend fun login(email: String, password: String) { idlingResource.setIdleState(false) authService.login(email, password) idlingResource.setIdleState(true) } }
121. 1. Idling Resources 2. Waiting for things 3. Replace components 1. Idling Resources class AuthRepository(val authService: AuthService) { private val idlingResource = SimpleIdlingResource() suspend fun login(email: String, password: String) { idlingResource.setIdleState(false) authService.login(email, password) idlingResource.setIdleState(true) } } goo.gle/espresso-idling-resources
122. 1. Idling Resources 2. Waiting for things 3. Replace components 1. Idling Resources
123. 1. Idling Resources 2. Waiting for things 3. Replace components 2. Waiting for things composeTestRule .onNodeWithText("LOG IN") .performClick()
124. 1. Idling Resources 2. Waiting for things 3. Replace components 2. Waiting for things composeTestRule .onNodeWithText("LOG IN") .performClick() // wait... composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled()
125. 1. Idling Resources 2. Waiting for things 3. Replace components 2. Waiting for things composeTestRule .onNodeWithText("LOG IN") .performClick() Thread.sleep(2000) // don't do this composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled()
126. 1. Idling Resources 2. Waiting for things 3. Replace components 2. Waiting for things composeTestRule .onNodeWithText("LOG IN") .performClick() // Wait until there's one element with a "LOG IN" text composeTestRule.waitUntil { composeTestRule .onAllNodesWithText("LOG IN") .fetchSemanticsNodes().size == 1 } composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled()
127. 1. Idling Resources 2. Waiting for things 3. Replace components 2. Waiting for things composeTestRule .onNodeWithText("LOG IN") .performClick() composeTestRule.waitUntilExists(hasText("LOG IN")) composeTestRule .onNodeWithText("LOG IN") .assertIsNotEnabled() goo.gle/compose-test-sync
128. 1. Idling Resources 2. Waiting for things 3. Replace components 3. Replace components Server Email validator LoginViewModel
129. 1. Idling Resources 2. Waiting for things 3. Replace components 3. Replace components LoginViewModel
130. 1. Idling Resources 2. Waiting for things 3. Replace components 3. Replace components LoginViewModel Fake Email validator
131. 1. Idling Resources 2. Waiting for things 3. Replace components d.android.com/training/testing
132. Replacing production modules with fakes
133. class MyTestSuite { @get:Rule var activityScenarioRule = activityScenarioRule<MyActivity>() @Test fun testEvent() { val scenario = activityScenarioRule.scenario ... } }
135. Hilt
136. @HiltAndroidTest class LoginScreenTest { @get:Rule var hiltRule = HiltAndroidRule(this) // UI tests here. }
137. @Module @InstallIn(SingletonComponent::class) abstract class AuthenticationModule { @Singleton @Binds abstract fun bindAuthService( AuthServiceImpl: AuthServiceImpl ): AuthService }
138. abstract class FakeAuthenticationModule { @Singleton @Binds abstract fun bindAuthService( fakeAuthService: FakeAuthService ): AuthService }
139. @Module @TestInstallIn( components = [SingletonComponent::class], replaces = [AuthenticationModule::class] ) abstract class FakeAuthenticationModule { @Singleton @Binds abstract fun bindAuthService( fakeAuthService: FakeAuthService ): AuthService }
140. d.android.com/training/dependency-injection/hilt-testing
141. Next steps
142. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 1. Implement app architecture d.android.com/topic/architecture
143. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 2. Configure CI service Build Local tests Instrumented tests CI Service
144. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 3. Write unit tests UI Layer UI elements State holders Data Layer Repositories Data sources Domain Layer Use cases
145. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 4. Screenshot tests for Previews Golden New Difference
146. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 5. Write smoke tests Large • Render app • Verify properties • Interact • Verify properties • Interact • Verify properties • Interact • Verify properties
147. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 6. Write tests for bugs Blimey! I can't log into the app. Rubbish. D. Turner July 6th, 2022
148. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 6. Write tests for bugs class EmailValidatorTest { }
149. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 6. Write tests for bugs class EmailValidatorTest { emailAddress_withMultiplePartsDomain_isValid() { assertTrue( EmailValidator().isValid(“person@example.co.uk") ) } }
150. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 6. Write tests for bugs class EmailValidatorTest { emailAddress_withMultiplePartsDomain_isValid() { assertTrue( EmailValidator().isValid(“person@example.co.uk") ) } }
151. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 7. Test everything else Step 1: Draw circles and lines Step 2: Finish drawing
152. 1. Implement app architecture 2. Configure CI service 3. Write unit tests 4. Screenshot tests for Previews 5. Write smoke tests 6. Write tests for bugs 7. Test everything else 7. Test everything else Element Class Method Line home 80% 78% 69% login 95% 92% 88% profile 90% 83% 79% ui 75% 75% 70% Test coverage
153. Learning about testing
154. d.android.com/training/testing Testing documentation Testing tools documentation Testing Compose Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Testing documentation
155. d.android.com/studio/test Testing documentation Testing tools documentation Testing Compose Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Testing tools documentation
156. d.android.com/jetpack/compose/testing Testing documentation Testing tools documentation Testing your Compose layout Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Testing Compose
157. Testing documentation Testing tools documentation Testing your Compose layout Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Compose testing cheat sheet
158. onView(ViewMatcher) .perform(ViewAction) .check(ViewAssertion); isDisplayed() isCompletelyDisplayed() isEnabled() hasFocus() isClickable() isChecked() isNotChecked() withEffectiveVisibility(...) isSelected() UI PROPERTIES allOf(Matchers) anyOf(Matchers) is(...) not(...) endsWith(String) startsWith(String) OBJECT MATCHER withId(...) withText(...) withTagKey(...) withTagValue(...) hasContentDescription(...) withContentDescription(...) withHint(...) withSpinnerText(...) hasLinks() hasEllipsizedText() hasMultilineTest() View Matchers USER PROPERTIES withParent(Matcher) withChild(Matcher) hasDescendant(Matcher) isDescendantOfA(Matcher) hasSibling(Matcher) isRoot() HIERARCHY supportsInputMethods(...) hasIMEAction(...) INPUT isAssignableFrom(...) withClassName(...) CLASS isFocusable() isTouchable() isDialog() withDecorView() isPlatformPopup() ROOT MATCHERS Preference matchers Cursor matchers Layout matchers SEE ALSO click() doubleClick() longClick() pressBack() pressIMEActionButton() pressKey([int/EspressoKey]) pressMenuKey() closeSoftKeyboard() openLink() View Actions CLICK/PRESS scrollTo() swipeLeft() swipeRight() swipeUp() swipeDown() GESTURES clearText() typeText(String) typeTextIntoFocusedView(String) replaceText(String) TEXT matches(Matcher) doesNotExist() View Assertions POSITION ASSERTIONS onData(ObjectMatcher) .DataOptions .perform(ViewAction) .check(ViewAssertion); inAdapterView(Matcher) atPosition(Integer) onChildView(Matcher) Data Options Testing documentation Testing tools documentation Testing your Compose layout Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Espresso cheat sheet
159. Testing documentation Testing tools documentation Testing your Compose layout Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Compose testing codelab
160. Testing documentation Testing tools documentation Testing your Compose layout Compose testing cheat sheet Espresso cheat sheet Compose testing codelab Other testing code labs Other testing codelabs
161. Now what?
162. when(developer) { Developer.BEGINNER -> developer.test() Developer.SKEPTIC -> developer.tryAgain() Developer.EXPERT -> developer.becomeTestingHero() }
163. Happy Testing!