Android UI test in Espresso

Developing scalable Android applications requires some level of discipline from the developers. One of this, is the act of Testing, which establishes some level of confidence in the code developers have written. While there are various ways to test your application, this talk focuses on Testing your Android Application using Espresso. We will discuss how Espresso enables you to test user interactions within your Android app to ensure that users do not encounter unexpected results or have a poor experience when interacting with your app. One of the great things about Espresso, is that its code looks a lot like English, which makes it predictable and easy to learn. The API is relatively small, and yet open for customization. Espresso tests run optimally fast (this will save you some development time). Why should I get into the habit of creating user interface (UI) tests and how do I verify that the UI of my app is functioning correctly? The answers to these questions and other questions relating to Android UI tests will be delivered to you. 'f u cn rd ths, u cn wrt Espresso tst.'

Transcript

1. GDG North Central DEVFEST 2017 Ekundayo Blessing
2. Android UI Tests in
3. • Sample Demo • R2 - Intents • R3 - Adapter Views • R4 - Idling Resources • Cheat sheet • Summary OUTLINE • Why Test UI? • What is espresso? • Setting up Espresso • Steps required • The FOUR roadmaps • R1 - Views
4. Why Test UI? • Correctness of App features • Ensures App achieve a high standard of quality • Establishment of confidence to implement new features
5. What is Espresso • Testing framework contained in the android support Testing support Library • Simple Api (easy to learn) • It synchronises your test action with the user interface of your application (Launches activity before test runs) • It runs optimally fast
6. What is Espresso (Packages) • Espresso core • Espresso web • Espresso-idling-resources • Espresso-contrib • espresso-intents
7. Setting up Espresso • Installation process (Android studio) • Configure espresso for your project • Turn off animation on Real devices Tools > Android > SDK Manager > SDK Tools > Android support repository androidTestCompile('com.android.support.test.espre sso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) testCompile 'junit:junit:4.12' defaultConfig { testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } Developer options > Drawing: turn off -Window animation scale -Transition animation scale -Animator duration scale
8. Steps required • Match a view • Perform an action • Assert and verify the result onView(withId(R.id.hello_world_button)) onView(withId(R.id.hello_world_button)). perform(click()); onView(withId(R.id.hello_world_text)). check(matches(isDisplayed()));
9. The FOUR roadmaps View Adapter views Intents Idling resources
10. R1 - Views • Locate views (Textview, buttons) • Perform action on view (click, typeText) • Check for result
11. Sample Demo
12. R2 - Intents • Intent Stubbing -- Fake response to intent call during testing -- Gives consistent response • Intent Verification -- Information intended in an intent is what is sent
13. R3 - Adapter Views String[] myArray = mActivityRule.getActivity().getResources() .getStringArray(R.array.labels_array); // Iterate through the spinner array of items. int size = myArray.length; for (int i=0; i<size; i++) { // Find the spinner and click on it. onView(withId(R.id.label_spinner)).perform(click()); // Find the spinner item and click on it. onData(is(myArray[i])).perform(click()); // Find the Submit button and click on it. onView(withId(R.id.button_main)).perform(click()); // Find the text view and check that the spinner item // is part of the string. onView(withId(R.id.text_phonelabel)) .check(matches(withText(containsString(myArray[i]))));
14. R4 - Idling Resources Espresso waits till the app is idle before perfoming the next action Use case -- Performing network calls and showing result
15. R4 - Idling Resources (continued)
16. Cheat Sheet
17. Learn more http://bit.ly/2zCQIU9
18. Questions
19. @blessochampion blessochampion@gmail.com Contacts
20. Thank you!