This document discusses UI testing with Espresso and introduces Screen Robots. It explains that Espresso is a framework for UI testing on Android. Screen Robots aim to simplify Espresso tests by encapsulating test steps into reusable objects. The document shows how a LoginScreenRobot can encapsulate the login flow into three lines of code rather than having many lines of explicit Espresso actions and assertions. This makes tests more readable and maintainable.

1. Screen Robots
@brwngrldev
UI Tests in Espresso

2. 1. User Interface Testing
2. Espresso
3. Screen Robots
Agenda
@brwngrldev

3. UI Testing
@brwngrldev
UI element

4. UI Testing
@brwngrldev

5. UI Testing
@brwngrldev

6. Espresso
• Framework
• View Matchers
• View Assertions
• View Actions
@brwngrldev

7. Usage
@brwngrldev

8. Usage
@brwngrldev

9. Usage
@brwngrldev

10. @Test
public void shouldProceedWithLoginWhenValid () {
onView( withId( R.id.login_username_entry ) )
.perform( typeText( TEST_EMAIL ) );
onView( withId( R.id.login_password_entry ) )
.perform( typeText( TEST_PASSWORD ) );
onView( withId( R.id.login_button ) )
.perform( click() );
intended( hasComponent( hasShortClassName( PACKAGE_NAME ) ) );
}
@brwngrldev

11. @Test
public void shouldProceedWithLoginWhenValid () {
onView( withId( … ) )
.perform( typeText( … ) );
onView( withId( … ) )
.perform( typeText( … ) );
onView( withId( … ) )
.perform( click() );
…
}
@brwngrldev

12. @Test
public void shouldProceedWithLoginWhenValid () {
< let’s do better />
}
@brwngrldev

13. @brwngrldev

14. @Test
public void shouldProceedWithLoginWhenValid () {
}
@brwngrldev

15. @Test
public void shouldProceedWithLoginWhenValid () {
withRobot( LoginScreenRobot.class )
}
@brwngrldev

16. @Test
public void shouldProceedWithLoginWhenValid () {
withRobot( LoginScreenRobot.class )
.callLogin( TEST_EMAIL, TEST_PASSWORD )
}
@brwngrldev

17. @Test
public void shouldProceedWithLoginWhenValid () {
withRobot( LoginScreenRobot.class )
.callLogin( TEST_EMAIL, TEST_PASSWORD )
.checkIsLoggedIn();
}
@brwngrldev

18. @brwngrldev
Just 3 lines
of code!

19. public LoginScreenRobot callLogin (String username, String password)
{
}
@brwngrldev
Screen Robot

20. public LoginScreenRobot callLogin (String username, String password)
{
return enterTextIntoView ( R.id.login_username_entry, username )
}
@brwngrldev
Screen Robot

21. public LoginScreenRobot callLogin (String username, String password)
{
return enterTextIntoView ( R.id.login_username_entry, username )
.enterTextIntoView ( R.id.login_password_entry, password )
}
@brwngrldev
Screen Robot

22. public LoginScreenRobot callLogin (String username, String password)
{
return enterTextIntoView ( R.id.login_username_entry, username )
.enterTextIntoView ( R.id.login_password_entry, password )
.clickOkOnView( R.id.login_button );
}
@brwngrldev
Screen Robot

23. @brwngrldev

24. @brwngrldev
Test Scenarios
• Login with valid credentials
• Login with invalid credentials
• Login with bad server response
• Changing the slide language
• Verifying the correctness of the slide content
• Entering content into a text slide

25. Summary
Screen Robots
User Interface Testing
Espresso
@brwngrldev

26. Thanks!
@brwngrldev
+AnnyceDavis
www.adavis.info