Test Driven Development for Android Applications

This slides talks about test driven development and software testing in android applications, why we should test, and how we can test our android apps.

Transcript

1. TEST DRIVEN DEVELOPMENT FOR ANDROID APPLICATIONS CODIFY 2.0 MEETUP
2. Hi, I’m Adora! Full Stack Web Developer Google Associate Android Developer Writer, adorahack.com Twitter: @theadoranwodo, @adorahack GitHub: @adoranwodo 2
3. “ Without requirements or design, programming is the art of adding bugs to an empty text file. - Louis Srygley 3
4. 4 Don’t be like this...
5. 5 Test Driven Development
7. 7 • Cleaner code • Rapid feedback on failures • Maintainable and scalable code • Confidence • Safe refactoring • Focus Test Driven Development
8. 8 The Testing Pyramid UI Tests Integration Tests Unit Tests
9. 1. UNIT TESTS ( Small Tests ) 9
10. 10 • Test methods, classes or components in isolation from production systems. • Verifies that the logic of individual units is correct • Very fundamental Unit Tests
11. Types of unit tests • Local Tests • Instrumented Tests Frameworks used for unit tests • Roboelectric • Mokito 11 Unit Tests in Android
14. 2. INTEGRATION TESTS ( Medium Tests ) 14
15. 15 • Integration tests are a subset of medium tests • Integrates several components • Run on emulators or real devices • Cloud-based services like Firebase Test Lab can be used Integration Tests
16. Firebase Test Lab is a cloud-based app-testing infrastructure. With one operation, you can test your Android or iOS app across a wide variety of devices and device configurations, and see the results—including logs, videos, and screenshots—in the Firebase console. 16 Firebase Test Lab
18. 3. UI TESTS ( Large Tests ) 18
19. 19 • Test that key end-user tasks work well on emulators and actual devices • Evaluate your apps functionality as a whole UI Tests
20. Tools for UI tests • Espresso • UI Automator • Robotium • Selendroid 20 UI Tests in Android
25. 4. WRITING BASIC TESTS 25
26. 26 //app level build.grade testImplementation 'junit:junit:4.12' compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" //Sample test class AdditionUnitTest { private val instance = MainActivity::class.createInstance() @Test fun additionOneIsCorrect() { //Test Case 1: Two positive numbers Assert.assertEquals(12, instance.addition(3,9)) } } Sample Unit Test
27. 27 //app level build.grade testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' androidTestImplementation 'com.android.support.test:rules:1.0.2' //Sample test @Test fun textViewsAreZeroOnLaunch(){ mActivityTestRule.launchActivity(null) //start activity //check results Espresso.onView(ViewMatchers.withId(R.id.teamA)).check(matches(withText("0"))) Espresso.onView(ViewMatchers.withId(R.id.teamB)).check(matches(withText("0"))) } Sample Instrumentation Test
28. 28 git clone https://github.com/AdoraNwodo/testingexample.git
29. Thanks! Website: www.adoranwodo.com Blog: www.adorahack.com GitHub: @adoranwodo Twitter: @theadoranwodo, @adorahack 29