Instrumented tests in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to annotate an instrumented test class.

Android Kotlin

import androidx.test.ext.junit.runners.AndroidJUnit4

@[1]
class ExampleInstrumentedTest {
}

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ABefore

BRunWith(AndroidJUnit4::class)

CTest

DIgnore

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Test instead of @RunWith for the class annotation.

Forgetting to specify the test runner causes the test not to run on device.

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

2fill in blank

medium

Complete the code to mark a function as an instrumented test.

Android Kotlin

import org.junit.Test

class ExampleInstrumentedTest {
    @[1]
    fun useAppContext() {
        // test code here
    }
}

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ATest

BBefore

CIgnore

DAfter

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Before or @After instead of @Test for test methods.

Forgetting to annotate test functions causes them not to run.

The @Test annotation marks a function as a test method to be run by the test runner.

3fill in blank

hard

Fix the error in the code to get the app context in an instrumented test.

Android Kotlin

import androidx.test.platform.app.InstrumentationRegistry

val appContext = InstrumentationRegistry.[1].targetContext

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AgetInstrumentation()

BgetContext()

CgetTargetContext()

DgetApplicationContext()

Attempts:

3 left

💡 Hint

Common Mistakes

Calling getContext() or getTargetContext() directly on InstrumentationRegistry causes errors.

Using getApplicationContext() is not available here.

The getInstrumentation() method returns the Instrumentation instance, from which you can get the target context.

4fill in blank

hard

Fill both blanks to launch an activity in an instrumented test.

Android Kotlin

import androidx.test.core.app.ActivityScenario

val scenario = ActivityScenario.[1](MainActivity::class.[2])

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Alaunch

Bjava

Cstart

Dkotlin

Attempts:

3 left

💡 Hint

Common Mistakes

Using start() instead of launch() causes errors.

Passing MainActivity::class without .java causes type errors.

ActivityScenario.launch() starts the activity for testing. The java property gets the Java class reference.

5fill in blank

hard

Fill all three blanks to assert the app package name in an instrumented test.

Android Kotlin

import androidx.test.platform.app.InstrumentationRegistry
import org.junit.Assert.*

val appContext = InstrumentationRegistry.[1].targetContext
assertEquals("[2]", appContext.[3].packageName)

Drag options to blanks, or click blank then click option'

AgetInstrumentation()

Bcom.example.myapp

CapplicationContext

DgetContext()

Attempts:

3 left

💡 Hint

Common Mistakes

Using getContext() instead of getInstrumentation() causes errors.

Accessing packageName directly on appContext without applicationContext may cause issues.

Use getInstrumentation() to get the Instrumentation, then get the applicationContext from the target context to check the package name.