Test Driven Development for Android Applications

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TEST DRIVEN DEVELOPMENT FOR ANDROID APPLICATIONS CODIFY 2.0 MEETUP

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Hi, I’m Adora! Full Stack Web Developer Google Associate Android Developer Writer, adorahack.com Twitter: @theadoranwodo, @adorahack GitHub: @adoranwodo 2

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“ Without requirements or design, programming is the art of adding bugs to an empty text file. - Louis Srygley 3

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4 Don’t be like this...

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5 Test Driven Development

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7 ● Cleaner code ● Rapid feedback on failures ● Maintainable and scalable code ● Confidence ● Safe refactoring ● Focus Test Driven Development

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8 The Testing Pyramid UI Tests Integration Tests Unit Tests

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1. UNIT TESTS ( Small Tests ) 9

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10 ● Test methods, classes or components in isolation from production systems. ● Verifies that the logic of individual units is correct ● Very fundamental Unit Tests

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Types of unit tests ● Local Tests ● Instrumented Tests Frameworks used for unit tests ● Roboelectric ● Mokito 11 Unit Tests in Android

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2. INTEGRATION TESTS ( Medium Tests ) 14

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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

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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

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3. UI TESTS ( Large Tests ) 18

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19 ● Test that key end-user tasks work well on emulators and actual devices ● Evaluate your apps functionality as a whole UI Tests

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Tools for UI tests ● Espresso ● UI Automator ● Robotium ● Selendroid 20 UI Tests in Android

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4. WRITING BASIC TESTS 25

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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

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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

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28 git clone https://github.com/AdoraNwodo/testingexample.git

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Thanks! Website: www.adoranwodo.com Blog: www.adorahack.com GitHub: @adoranwodo Twitter: @theadoranwodo, @adorahack 29