For #26286 new undoDeleteHistoryItemTest UI test

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

@@ -129,6 +129,27 @@ class HistoryTest {
         }
     }
 
+    @Test
+    fun undoDeleteHistoryItemTest() {
+        val firstWebPage = TestAssetHelper.getGenericAsset(mockWebServer, 1)
+
+        navigationToolbar {
+        }.enterURLAndEnterToBrowser(firstWebPage.url) {
+            mDevice.waitForIdle()
+        }.openThreeDotMenu {
+        }.openHistory {
+            verifyHistoryListExists()
+            historyListIdlingResource =
+                RecyclerViewIdlingResource(activityTestRule.activity.findViewById(R.id.history_list), 1)
+            IdlingRegistry.getInstance().register(historyListIdlingResource!!)
+            clickDeleteHistoryButton(firstWebPage.url.toString())
+            IdlingRegistry.getInstance().unregister(historyListIdlingResource!!)
+            verifyUndoDeleteSnackBarButton()
+            clickUndoDeleteButton()
+            verifyHistoryItemExists(true, firstWebPage.url.toString())
+        }
+    }
+
     @SmokeTest
     @Test
     fun deleteAllHistoryTest() {

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

@@ -82,6 +82,12 @@ class HistoryRobot {
 
     fun verifyDeleteSnackbarText(text: String) = assertSnackBarText(text)
 
+    fun verifyUndoDeleteSnackBarButton() = assertUndoDeleteSnackBarButton()
+
+    fun clickUndoDeleteButton() {
+        snackBarUndoButton().click()
+    }
+
     class Transition {
         fun goBackToBrowser(interact: BrowserRobot.() -> Unit): BrowserRobot.Transition {
             mDevice.pressBack()
@@ -155,3 +161,8 @@ private fun assertCopySnackBarText() = snackBarText().check(matches(withText("UR
 
 private fun assertSnackBarText(text: String) =
     snackBarText().check(matches(withText(Matchers.containsString(text))))
+
+private fun snackBarUndoButton() = onView(withId(R.id.snackbar_btn))
+
+private fun assertUndoDeleteSnackBarButton() =
+    snackBarUndoButton().check(matches(withText("UNDO")))