No issue: New UI smoke test for the Language menu

app/src/androidTest/java/org/mozilla/fenix/helpers/TestHelper.kt

@@ -48,6 +48,7 @@ object TestHelper {
 
     fun scrollToElementByText(text: String): UiScrollable {
         val appView = UiScrollable(UiSelector().scrollable(true))
+        appView.waitForExists(waitingTime)
         appView.scrollTextIntoView(text)
         return appView
     }

app/src/androidTest/java/org/mozilla/fenix/ui/SmokeTest.kt

@@ -48,6 +48,9 @@ import org.mozilla.fenix.ui.robots.notificationShade
 import org.mozilla.fenix.ui.robots.openEditURLView
 import org.mozilla.fenix.ui.robots.searchScreen
 import org.mozilla.fenix.ui.robots.tabDrawer
+import org.mozilla.fenix.ui.util.FRENCH_LANGUAGE_HEADER
+import org.mozilla.fenix.ui.util.FRENCH_SYSTEM_LOCALE_OPTION
+import org.mozilla.fenix.ui.util.ROMANIAN_LANGUAGE_HEADER
 import org.mozilla.fenix.ui.util.STRING_ONBOARDING_TRACKING_PROTECTION_HEADER
 
 /**
@@ -66,6 +69,7 @@ class SmokeTest {
     private val downloadFileName = "Globe.svg"
     private val collectionName = "First Collection"
     private var bookmarksListIdlingResource: RecyclerViewIdlingResource? = null
+    private var localeListIdlingResource: RecyclerViewIdlingResource? = null
     private val customMenuItem = "TestMenuItem"
 
     // This finds the dialog fragment child of the homeFragment, otherwise the awesomeBar would return null
@@ -133,6 +137,10 @@ class SmokeTest {
         if (readerViewNotification != null) {
             IdlingRegistry.getInstance().unregister(readerViewNotification)
         }
+
+        if (localeListIdlingResource != null) {
+            IdlingRegistry.getInstance().unregister(localeListIdlingResource)
+        }
     }
 
     // Verifies the first run onboarding screen
@@ -1375,4 +1383,26 @@ class SmokeTest {
             verifyPastedToolbarText("Page content: 1")
         }
     }
+
+    @Test
+    fun switchLanguageTest() {
+        homeScreen {
+        }.openThreeDotMenu {
+        }.openSettings {
+        }.openLanguageSubMenu {
+            localeListIdlingResource =
+                RecyclerViewIdlingResource(
+                    activityTestRule.activity.findViewById(R.id.locale_list),
+                    2
+                )
+            IdlingRegistry.getInstance().register(localeListIdlingResource)
+            selectLanguage("Romanian")
+            verifyLanguageHeaderIsTranslated(ROMANIAN_LANGUAGE_HEADER)
+            selectLanguage("Français")
+            verifyLanguageHeaderIsTranslated(FRENCH_LANGUAGE_HEADER)
+            selectLanguage(FRENCH_SYSTEM_LOCALE_OPTION)
+            verifyLanguageHeaderIsTranslated("Language")
+            IdlingRegistry.getInstance().unregister(localeListIdlingResource)
+        }
+    }
 }

app/src/androidTest/java/org/mozilla/fenix/ui/robots/SettingsSubMenuLanguageRobot.kt

@@ -9,9 +9,24 @@ import androidx.test.espresso.action.ViewActions
 import androidx.test.espresso.matcher.ViewMatchers
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
+import androidx.test.uiautomator.UiScrollable
+import androidx.test.uiautomator.UiSelector
+import junit.framework.TestCase.assertTrue
 import org.hamcrest.CoreMatchers
+import org.mozilla.fenix.helpers.TestAssetHelper.waitingTime
+import org.mozilla.fenix.helpers.TestHelper.packageName
 
 class SettingsSubMenuLanguageRobot {
+    fun selectLanguage(language: String) {
+        languagesList.waitForExists(waitingTime)
+        languagesList
+            .getChildByText(UiSelector().text(language), language)
+            .click()
+    }
+
+    fun verifyLanguageHeaderIsTranslated(translation: String) =
+        assertTrue(mDevice.findObject(UiSelector().text(translation)).waitForExists(waitingTime))
+
     class Transition {
         val mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
 
@@ -27,3 +42,10 @@ class SettingsSubMenuLanguageRobot {
 
 private fun goBackButton() =
     onView(CoreMatchers.allOf(ViewMatchers.withContentDescription("Navigate up")))
+
+private val languagesList =
+    UiScrollable(
+        UiSelector()
+            .resourceId("$packageName:id/locale_list")
+            .scrollable(true)
+    )

app/src/androidTest/java/org/mozilla/fenix/ui/util/Strings.kt

@@ -7,3 +7,6 @@ package org.mozilla.fenix.ui.util
 const val STRING_ONBOARDING_ACCOUNT_SIGN_IN_HEADER = "Sync Firefox between devices"
 const val STRING_ONBOARDING_TRACKING_PROTECTION_HEADER = "Always-on privacy"
 const val STRING_ONBOARDING_TOOLBAR_PLACEMENT_HEADER = "Pick your toolbar placement"
+const val FRENCH_LANGUAGE_HEADER = "Langues"
+const val ROMANIAN_LANGUAGE_HEADER = "Limbă"
+const val FRENCH_SYSTEM_LOCALE_OPTION = "Utiliser la langue de l’appareil"