launchInActivity.kt

launchInActivity.kt

inline fun <reified F : Fragment, reified A : AppCompatActivity> launchInActivity(
        crossinline fragmentFactory: () -> F,
        state: Lifecycle.State = Lifecycle.State.RESUMED,
        layoutId: Int = android.R.id.content,
        isTestOnlyActivity: Boolean = false
    ) : ActivityScenario<A> {

        //Manually register test only Activity since manifest merging is broken for test resources https://github.com/robolectric/robolectric/issues/4725
        if(isTestOnlyActivity) {
            val appContext = ApplicationProvider.getApplicationContext<Application>()
            val activityInfo = ActivityInfo().apply {
                name = A::class.java.name
                packageName = appContext.packageName
            }
            shadowOf(appContext.packageManager).addOrUpdateActivity(activityInfo)
        }

        val activityScenario = ActivityScenario.launch(A::class.java)

        activityScenario.onActivity {
            val fragment = fragmentFactory()
            it.supportFragmentManager
                .beginTransaction()
                .replace(layoutId, fragment, F::class.java.name)
                .setMaxLifecycle(fragment, state)
                .commitNow()
        }

        return activityScenario
    }