Android Automation Test with Espresso

1. Android Automation Test with
Espresso
Trần Văn Toàn –
vantoan@planday.com

2. Table Of Content
 About Espresso
 Espresso Components
 Test case structure
 Custom Matcher and ViewAction

3. About Espresso
 An user interface testing framework for a single
application
 Run on devices running Android 2.2 and higher
 The Espresso is an instrumentation-based API and
works with the AndroidJUnitRunner test

4. Espresso - Pros
 Reliable & synchronizes test actions with UI
operations (on the UI thread).
 open to customization with standard hamcrest
matchers
 Clear failure, rich debugging information. Allows
custom failure handler

5. Espresso - Cons
 Does not support for WebView
 Slow speed since it run on Dalvik VM
 Work with Single application only.
 Solution: Using Espresso combine with uiautomator

6. Espresso Components
 ViewMatchers: find view based on: id, Tag,
description, text…
withId(R.id.button)
 ViewActions: perform actions on the views
click(), scrollTo()
 ViewAssertions: validate state of a view.
matches(isDisplayed()), doesNotExist()

7. Test case structure

8. Find View
 Find the UI component under test in an Activity
by using the onView() or onData() method with a
view matcher which selects the correct view.

9. Perform Actions
 Call perform() method and passing in the user
action defined by ViewActions class.
 Repeat the steps to simulate a user flow across
multiple activities in the target app

10. Validate the results
 Call check() method to check expected state or
behavior
 check() method requires a ViewAssertion object
as input

11. Custom Matcher &
ViewAction Custom Matcher using BoundedMatcher or Hamcrest
framework

12. Custom Matcher &
ViewAction Custom Action by ViewAction class

13. THANK FOR WATCHING!

14. APPENDIX

15. Add Espresso to project
 install the Android Support Repository

16. Add Espresso to project
 Config project

17. Add Espresso to project
 Specify the AndroidJUnitRunner as value for the
testInstrumentationRunner

18. Construct Test Class and
Methods

19. References documents
1. https://developer.android.com/training/testing/ui-
testing/espresso-testing.html
2. https://google.github.io/android-testing-support-
library/docs/espresso/
3. http://www.vogella.com/tutorials/AndroidTestingEspresso/artic
le.html
4. http://hamcrest.org/JavaHamcrest/