Instrumented tests in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are instrumented tests in Android development?

Instrumented tests run on a real device or emulator and can interact with the Android framework and UI components.

beginner

Which Android testing framework is commonly used for instrumented tests?

Espresso is commonly used for instrumented UI tests in Android to simulate user interactions.

beginner

Where are instrumented test files located in an Android project?

They are located in the src/androidTest/java directory of the project.

intermediate

What annotation is used to mark an instrumented test class in Android?

The @RunWith(AndroidJUnit4::class) annotation marks a class to run with the AndroidJUnit4 test runner.

beginner

Why do instrumented tests require a device or emulator to run?

Because they interact with Android system components and UI, which only exist on a device or emulator.

Where do instrumented tests run?

A On a real device or emulator

B On the local JVM without Android framework

C Only on physical devices

D Only on desktop computers

Instrumented tests run on a real device or emulator to access Android system components.

Which directory contains instrumented test code in an Android project?

A src/main/java

B src/test/java

C src/resources

D src/androidTest/java

Instrumented tests are placed under src/androidTest/java to separate them from local unit tests.

Which annotation is used to specify the test runner for instrumented tests?

A @RunWith(AndroidJUnit4::class)

B @Ignore

C @Before

D @Test

@RunWith(AndroidJUnit4::class) tells the system to use the AndroidJUnit4 runner for instrumented tests.

What is Espresso used for in Android instrumented tests?

A Writing local unit tests

B Simulating user interactions with UI

C Building APK files

D Managing app permissions

Espresso is a testing framework to simulate user actions like clicks and typing in instrumented tests.

Why can't instrumented tests run on the local JVM alone?

A They need internet access

B They require special hardware

C They require Android system APIs and UI components

D They only test backend logic

Instrumented tests need Android APIs and UI, which are not available on the local JVM.

Explain what instrumented tests are and why they are important in Android development.

Think about how you test the app like a user on a phone.

Describe the typical setup and annotations needed to write an instrumented test in Kotlin for Android.

Consider where the code lives and how the test runner is specified.