For #20919 quit the after removing a study.

app/src/main/java/org/mozilla/fenix/settings/studies/StudiesAdapter.kt

@@ -5,12 +5,15 @@
 package org.mozilla.fenix.settings.studies
 
 import android.annotation.SuppressLint
+import android.content.Context
+import android.content.DialogInterface
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.TextView
 import androidx.annotation.StringRes
 import androidx.annotation.VisibleForTesting
+import androidx.appcompat.app.AlertDialog
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.ListAdapter
@@ -117,10 +120,32 @@ class StudiesAdapter(
         holder.summaryView.text = study.userFacingDescription
 
         holder.deleteButton.setOnClickListener {
-            studiesDelegate.onRemoveButtonClicked(study)
+            showDeleteDialog(holder.titleView.context, study)
         }
     }
 
+    @VisibleForTesting
+    internal fun showDeleteDialog(context: Context, study: EnrolledExperiment): AlertDialog {
+        val builder = AlertDialog.Builder(context)
+            .setPositiveButton(
+                R.string.studies_restart_dialog_ok
+            ) { dialog, _ ->
+                studiesDelegate.onRemoveButtonClicked(study)
+                dialog.dismiss()
+            }
+            .setNegativeButton(
+                R.string.studies_restart_dialog_cancel
+            ) { dialog: DialogInterface, _ ->
+                dialog.dismiss()
+            }
+            .setTitle(R.string.preference_experiments_2)
+            .setMessage(R.string.studies_restart_app)
+            .setCancelable(false)
+        val alertDialog: AlertDialog = builder.create()
+        alertDialog.show()
+        return alertDialog
+    }
+
     internal fun createListWithSections(studies: List<EnrolledExperiment>): List<Any> {
         val itemsWithSections = ArrayList<Any>()
         val activeStudies = ArrayList<EnrolledExperiment>()

app/src/main/java/org/mozilla/fenix/settings/studies/StudiesInteractor.kt

@@ -4,10 +4,12 @@
 
 package org.mozilla.fenix.settings.studies
 
+import androidx.annotation.VisibleForTesting
 import mozilla.components.service.nimbus.NimbusApi
 import org.mozilla.experiments.nimbus.internal.EnrolledExperiment
 import org.mozilla.fenix.BrowserDirection
 import org.mozilla.fenix.HomeActivity
+import kotlin.system.exitProcess
 
 interface StudiesInteractor {
     /**
@@ -35,5 +37,11 @@ class DefaultStudiesInteractor(
 
     override fun removeStudy(experiment: EnrolledExperiment) {
         experiments.optOut(experiment.slug)
+        killApplication()
+    }
+
+    @VisibleForTesting
+    internal fun killApplication() {
+        exitProcess(0)
     }
 }

app/src/main/res/values/strings.xml

@@ -623,6 +623,12 @@
     <string name="studies_description">Firefox may install and run studies from time to time.</string>
     <!-- Learn more link for studies, links to an article for more information about studies. -->
     <string name="studies_learn_more">Learn more</string>
+    <!-- Dialog message shown after removing a study -->
+    <string name="studies_restart_app">The application will quit to apply changes</string>
+    <!-- Dialog button to confirm the removing a study. -->
+    <string name="studies_restart_dialog_ok">OK</string>
+    <!-- Dialog button text for canceling removing a study. -->
+    <string name="studies_restart_dialog_cancel">Cancel</string>
 
     <!-- Sessions -->
     <!-- Title for the list of tabs -->

app/src/test/java/org/mozilla/fenix/settings/studies/DefaultStudiesInteractorTest.kt

@@ -7,7 +7,10 @@ package org.mozilla.fenix.settings.studies
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.RelaxedMockK
+import io.mockk.just
 import io.mockk.mockk
+import io.mockk.runs
+import io.mockk.spyk
 import io.mockk.verify
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import mozilla.components.service.nimbus.NimbusApi
@@ -30,7 +33,7 @@ class DefaultStudiesInteractorTest {
     @Before
     fun setup() {
         MockKAnnotations.init(this)
-        interactor = DefaultStudiesInteractor(activity, experiments)
+        interactor = spyk(DefaultStudiesInteractor(activity, experiments))
     }
 
     @Test
@@ -48,6 +51,7 @@ class DefaultStudiesInteractorTest {
         val experiment = mockk<EnrolledExperiment>(relaxed = true)
 
         every { experiment.slug } returns "slug"
+        every { interactor.killApplication() } just runs
 
         interactor.removeStudy(experiment)
 

app/src/test/java/org/mozilla/fenix/settings/studies/StudiesAdapterTest.kt

@@ -16,9 +16,9 @@ import io.mockk.mockk
 import io.mockk.runs
 import io.mockk.spyk
 import io.mockk.verify
-import junit.framework.TestCase.assertTrue
-import junit.framework.TestCase.assertFalse
 import junit.framework.TestCase.assertEquals
+import junit.framework.TestCase.assertFalse
+import junit.framework.TestCase.assertTrue
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import mozilla.components.support.test.robolectric.testContext
 import org.junit.Before
@@ -69,7 +69,7 @@ class StudiesAdapterTest {
     fun `WHEN bindStudy THEN bind the study information`() {
         val holder = mockk<StudyViewHolder>()
         val study = mockk<EnrolledExperiment>()
-        val titleView = mockk<TextView>(relaxed = true)
+        val titleView = spyk(TextView(testContext))
         val summaryView = mockk<TextView>(relaxed = true)
         val deleteButton = spyk(MaterialButton(testContext))
 
@@ -82,6 +82,8 @@ class StudiesAdapterTest {
 
         adapter = spyk(StudiesAdapter(delegate, listOf(study), false))
 
+        every { adapter.showDeleteDialog(any(), any()) } returns mockk()
+
         adapter.bindStudy(holder, study)
 
         verify {
@@ -92,7 +94,7 @@ class StudiesAdapterTest {
         deleteButton.performClick()
 
         verify {
-            delegate.onRemoveButtonClicked(study)
+            adapter.showDeleteDialog(any(), any())
         }
     }