Espresso is an Android UI testing framework that allows creation of automated UI tests. It has a simple API to interact with views and verify app functionality without needing to launch activities or intents. Tests can click buttons, enter text, and check for text using ViewMatchers, ViewActions, and ViewAssertions. Espresso provides reliable, fast tests that run on actual devices or emulators and mimic user interactions.

1. Express Automation Using
Espresso

2. ➢ What and how
➢ Components of espresso
➢ Extensions and others
➢ Pros and cons

3. WHAT
● A UI test framework (part of the Android
Testing Support Library)
● To create automated UI tests for Android
app
● Gradle + Android Studio support
● Simple and Extensible API remains open
for customization

4. HOW
● Install android support repository
● In build.gradle dependencies
androidTestCompile 'com.android.support.test.espresso:espresso-
core:2.2.2'
androidTestCompile 'com.android.support.test:runner:0.5'
● Under default config
testInstrumentationRunner
"android.support.test.runner.AndroidJUnitRunner"
● Create class with
@RunWith(AndroidJUnit4.class)
● Specify Activity to be tested with @Rule and Create test functions with
@Test

6. Main components of Espresso :
● Espresso – Entry point to interact with views and APIs not tied
to view
● ViewMatchers – To identify view within view hierarchy
● ViewActions – Do action on view
● ViewAssertions – Verify or Assert on view

7. ● OnView
● OnData
● PressBack
● CloseSoftKeyboard
Espresso

8. withId(R.id.error_msg)
withContentDescription("More options")
allOf(withId(R.id.error_msg_text),withEffectiveVisibility(ViewMatche
rs.Visibility.VISIBLE)
allOf(withId(R.id.count),
hasSibling(withText(R.string.summary_header)
ViewMatchers

9. ● Perform(click(.....))
● Perform(ScrollTo(....))
● Perform(replaceText(....))
● Perform(swipeRight(....))
ViewActions

10. check(matches(withText(quantity)))
check(matches(withChild(withText(message))))
check(matches(hasDescendant(withText(heading))))
check(doesNotExist())
check(matches(isDisplayed()))
ViewAssertions

11. atPosition()
- onData(...).atPosition(2).perform(click());
inRoot()
- toast message checking
- prompts etc...
onChildView()
Data Interaction

12. ● GetChildCount()
● SetMobileData()
● ScanActions()
● SetProfile()
Extensible & Customizable

13. ● Webview
● StubTesting using Intent and ServiceTestRule
● Extend to test performance, memory leakage ...
● Pretty reports
Others

14. ● API is small, predictable and easy to learn
● Support from API level 8 (Froyo)
● Light weight, Fast and Reliable test
● Rich failure information and customizable
failure handling
● Automatic synchronization of test actions
loopmainthreaduntilidle
● Can use UI automator methods
● Runs on actual device or emulator, mimics user
WHY

15. ● Application push notifications
● Sync Test
● Navigating from another app to your app
● Extending test to other OS
WHAT NOT

16. ● http://developer.android.com/
● https://github.com/codepath/android_guides/wiki/UI
● https://google.github.io/android-testing-support-libra
Reference
● http://developer.android.com/
● https://github.com/codepath/android_guides/wiki/UI
● https://google.github.io/android-testing-support-libra