The document discusses Android UI testing using Espresso, focusing on its syntax, setup, and structure for writing tests. It covers common problems faced during testing, such as flaky tests and detecting UI threads, and provides solutions like using custom view actions and idling resources. The content also includes examples of test cases to demonstrate the use of Espresso in various scenarios.

1. Android UI Testing
with Espresso

2. Gary Cheng
KKBOX
Android automation

3. Espresso
• Introduce Espresso
• How to write Android UI testing
• The problems we met

4. Introduction

6. Simple Syntax onView( … )
.perform ( … )
.check ( … )

7. Reliability
main thread

8. Network response
idling resource
v.s.
waiting mechanism

9. Run Faster
Appium / Espresso

10. Espresso Appium

11. Espresso Appium
Setup
Speed
Reliability

12. Use Services
login / logout

13. Service
onView( drawer ).perform( click )
onView( account ).perform( click )
onView( logoutButton ).perform( click )
KKBOXService.loginController.logout( )
UI

14. Source Code

15. Espresso
• Simple
• Faster
• Reliability
• Services

16. 現況
Flaky Rate 2.3 %

17. How to Use Espresso
• setup
• syntax
• structure

18. Setup

19. Setup
Dependencies / Instrumentation Runner

20. Create Emulator

21. Open developer option

22. Disable animation

23. Syntax

24. onView( … )
.perform ( … )
.check ( … )

25. onView( ViewMatcher )
.perform ( … )
.check ( … )

26. ViewMatcher
• withId(…)
• withText(…)

27. onView( withId(…) )
.perform ( … )
.check ( … )

28. onView( withId(…) )
.perform ( ViewAction )
.check ( … )

29. ViewAction
• click( )
• scrollTo( )
• typeText( … )

30. onView( withId(…) )
.perform ( click( ) )
.check ( … )

31. onView( withId(…) )
.perform ( click( ) )
.check ( ViewAssertion )

32. ViewAssertion
• matches( … )
• doesNotExist( )

33. onView( withId( … ) )
.perform ( click( ) )
.check ( matches( … ) )

34. onView( playButton )
.perform ( click )
.check ( musicPlayed )

35. Structure

37. @Rule
annotaion

38. @Rule -> @Before -> @Test -> @After

39. @Rule -> @Before -> @Test -> @After

40. @Rule -> @Before -> @Test -> @After

41. @Rule -> @Before -> @Test -> @After

42. @Rule -> @Test

43. • setup
• syntax
• structure

44. Test Case 1
click count button will
plus 1

45. UI Automator Viewer
/Users/{user_name}/Library/Android/sdk/tools/bin

46. onView( withId( … ) )
.perform ( click( ) )
.check ( matches( … ) )

47. Recyclerview

49. onView( withId( … ) )
.perform ( RecyclerViewAction( … ) )

50. RecyclerViewAction
• actionOnItem( ViewMatcher, ViewAction )
• actionOnItemAtPosition( Position, ViewAction )

51. onView( withId( … ) )
.perform ( actionOnItem( … ) )

52. Test Case 2
Click animal item in the
list will show the animal

53. Test Case 3
Click item by position in
the list will show the
correct position info

54. Index

55. onView( withId( … ) )
.perform ( actionOnItemAtPosition( … ) )

56. • Normal case
• Recyclerview
• actionOnItem
• actionOnItemAtPosition

57. Problems

58. Problem 1
RecyclerViewAction can not scroll out the last views

59. Normal Case

60. Espresso

61. Why!!!
Just can't see the view

62. Solution 1
scroll a little more before click action

63. Custom ViewAction

64. Custom ViewAction

65. Custom ViewAction

66. Custom ViewAction

67. onView ( RecyclerView )
.perform ( actionOnItem ( 有聲書, customClick( ) ) )

68. Fix !!!!

69. Problem 2
Espresso only detect the UI thread

70. How about Idling
Resource

71. Solution 2
Implement waiting mechanism

72. waitForViewDisplayed

73. waitForViewDisplayed

74. • custom ViewAction
• waiting mechanism
Problems

76. Thank you