Closes #12645: Re-enable mediaSystemNotificationInPrivateModeTest

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

@@ -8,7 +8,6 @@ import androidx.test.uiautomator.UiSelector
 import okhttp3.mockwebserver.MockWebServer
 import org.junit.After
 import org.junit.Before
-import org.junit.Ignore
 import org.junit.Rule
 import org.junit.Test
 import org.mozilla.fenix.helpers.AndroidAssetDispatcher
@@ -61,6 +60,7 @@ class MediaNotificationTest {
         }.enterURLAndEnterToBrowser(videoTestPage.url) {
             mDevice.waitForIdle()
             clickMediaPlayerPlayButton()
+            waitForPlaybackToStart()
         }.openNotificationShade {
             verifySystemNotificationExists(videoTestPage.title)
             clickMediaSystemNotificationControlButton("Pause")
@@ -136,7 +136,6 @@ class MediaNotificationTest {
         }
     }
 
-    @Ignore("Flaky test, temp disabled: https://github.com/mozilla-mobile/fenix/issues/12645")
     @Test
     fun mediaSystemNotificationInPrivateModeTest() {
         val audioTestPage = TestAssetHelper.getAudioPageAsset(mockWebServer)
@@ -160,6 +159,7 @@ class MediaNotificationTest {
             verifyMediaIsPaused()
         }.openTabDrawer {
             closeTab()
+            verifySnackBarText("Private tab closed")
         }
 
         mDevice.openNotification()

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

@@ -12,14 +12,12 @@ import android.net.Uri
 import androidx.test.espresso.Espresso.onView
 import androidx.test.espresso.Espresso.pressBack
 import androidx.test.espresso.action.ViewActions
-import androidx.test.espresso.action.ViewActions.click
 import androidx.test.espresso.assertion.ViewAssertions.matches
 import androidx.test.espresso.intent.Intents
 import androidx.test.espresso.intent.matcher.BundleMatchers
 import androidx.test.espresso.intent.matcher.IntentMatchers
 import androidx.test.espresso.matcher.RootMatchers.isDialog
 import androidx.test.espresso.matcher.ViewMatchers
-import androidx.test.espresso.matcher.ViewMatchers.withContentDescription
 import androidx.test.espresso.matcher.ViewMatchers.Visibility
 import androidx.test.espresso.matcher.ViewMatchers.isCompletelyDisplayed
 import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
@@ -33,7 +31,6 @@ import androidx.test.uiautomator.By.text
 import androidx.test.uiautomator.UiDevice
 import androidx.test.uiautomator.UiSelector
 import androidx.test.uiautomator.Until
-import androidx.test.uiautomator.Until.hasObject
 import org.hamcrest.CoreMatchers.allOf
 import org.hamcrest.CoreMatchers.containsString
 import org.junit.Assert.assertTrue
@@ -328,14 +325,7 @@ class BrowserRobot {
     }
 
     fun clickMediaPlayerPlayButton() {
-        mDevice.waitNotNull(
+        mediaPlayerPlayButton().waitForExists(waitingTime)
-            hasObject(
-                By
-                    .clazz("android.widget.Button")
-                    .textContains("Play")
-            ),
-            waitingTime
-        )
         mediaPlayerPlayButton().click()
     }
 
@@ -459,9 +449,9 @@ private fun tabsCounter() = onView(withId(R.id.counter_box))
 
 private fun mediaPlayerPlayButton() =
     mDevice.findObject(
-        By
+        UiSelector()
-            .clazz("android.widget.Button")
+            .className("android.widget.Button")
-            .textContains("Play")
+            .text("Play")
     )
 
 private fun assertBlueDot() {