How do I use activityScenarioRule<Activity>?

Question

I'm following the dev guide here:

https://developer.android.com/guide/components/activities/testing

and have a test class like:

@RunWith(AndroidJUnit4::class)
class MyTestSuite {
   @get:Rule var activityScenarioRule = activityScenarioRule<MyActivity>()

   @Test fun testEvent() {
    val scenario = activityScenarioRule.scenario
   }
}

the method activityScenarioRule<T>() is not defined. What dependency do I need? Also, what is the best way to determine which dependencies to add when reading these docs?

Answer 1

The activityScenarioRule<T>() method is part of the androidx.test.ext:junit-ktx:1.1.0 dependency.

Usually, this would be listed under the List of AndroidX Test dependencies, but it appears it isn't up to date with the junit-ktx or core-ktx modules as of yet, despite it being explicitly mentioned as part of the Version 1.1.0-beta01 release notes

Answer 2

If you are not using the ktx dependency, e.g. androidx.test.ext:junit:1.1.2 you can do it like this:

@get:Rule
var activityScenarioRule = ActivityScenarioRule(MyActivity::class.java)