[fenix] Improve coverage for cancelCreateBookmarkFolderTest UI test

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

@@ -166,6 +166,7 @@ class BookmarksTest {
             addNewFolderName(bookmarksFolderName)
             navigateUp()
             verifyKeyboardHidden()
+            verifyBookmarkFolderIsNotCreated(bookmarksFolderName)
         }
     }
 

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

@@ -32,6 +32,7 @@ import androidx.test.uiautomator.Until
 import org.hamcrest.Matchers.allOf
 import org.hamcrest.Matchers.containsString
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
 import org.mozilla.fenix.R
 import org.mozilla.fenix.helpers.TestAssetHelper
 import org.mozilla.fenix.helpers.TestAssetHelper.waitingTime
@@ -67,6 +68,8 @@ class BookmarksRobot {
         assertFolderTitle(title)
     }
 
+    fun verifyBookmarkFolderIsNotCreated(title: String) = assertBookmarkFolderIsNotCreated(title)
+
     fun verifyBookmarkTitle(title: String) {
         mDevice.findObject(UiSelector().text(title)).waitForExists(waitingTime)
         assertBookmarkTitle(title)
@@ -318,6 +321,20 @@ private fun assertCloseButton() = closeButton().check(matches(withEffectiveVisib
 private fun assertEmptyBookmarksList() =
     onView(withId(R.id.bookmarks_empty_view)).check(matches(withText("No bookmarks here")))
 
+private fun assertBookmarkFolderIsNotCreated(title: String) {
+    mDevice.findObject(
+        UiSelector()
+            .resourceId("$packageName:id/bookmarks_wrapper")
+    ).waitForExists(waitingTime)
+
+    assertFalse(
+        mDevice.findObject(
+            UiSelector()
+                .textContains(title)
+        ).waitForExists(waitingTime)
+    )
+}
+
 private fun assertBookmarkFavicon(forUrl: Uri) = bookmarkFavicon(forUrl.toString()).check(
     matches(
         withEffectiveVisibility(