What do I need to import to use launchActivity<>() in UnitTests?

Question

So I'm trying to test my activity following googles instructions here: https://developer.android.com/guide/components/activities/testing

But the code launchActivity<MyActivity>() does not work. Do I need to define launchActivity as a rule or is there a library I need to import in gradle?

These are the imports I already have

testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'

Answer 1

You need to import following dependency into your gradle.

androidTestImplementation 'androidx.test:core-ktx:1.1.0'

Moreover, also add this in gradle file to avoid compile time error after adding launchActivity method in your test code.

kotlinOptions {
        jvmTarget = JavaVersion.VERSION_1_8.toString()
    }