[fenix] Fix https://github.com/mozilla-mobile/fenix/issues/16960 & https://github.com/mozilla-mobile/fenix/issues/16959: updateSavedLoginTest, swipeToSwitchTabTest UI smoke tests

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

@@ -39,12 +39,14 @@ import org.junit.Assert.assertTrue
 import org.mozilla.fenix.R
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.helpers.Constants.LONG_CLICK_DURATION
-import org.mozilla.fenix.helpers.TestAssetHelper
+import org.mozilla.fenix.helpers.SessionLoadedIdlingResource
 import org.mozilla.fenix.helpers.TestAssetHelper.waitingTime
 import org.mozilla.fenix.helpers.click
 import org.mozilla.fenix.helpers.ext.waitNotNull
 
 class BrowserRobot {
+    private lateinit var sessionLoadedIdlingResource: SessionLoadedIdlingResource
+
     fun verifyCurrentPrivateSession(context: Context) {
         val session = context.components.core.sessionManager.selectedSession
         assertTrue("Current session is private", session?.private!!)
@@ -52,13 +54,16 @@ class BrowserRobot {
 
     fun verifyUrl(url: String) {
         val mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
+        sessionLoadedIdlingResource = SessionLoadedIdlingResource()
+
         mDevice.waitNotNull(
             Until.findObject(By.res("org.mozilla.fenix.debug:id/mozac_browser_toolbar_url_view")),
             waitingTime
         )
-        TestAssetHelper.waitingTime
+        runWithIdleRes(sessionLoadedIdlingResource) {
-        onView(withId(R.id.mozac_browser_toolbar_url_view))
+            onView(withId(R.id.mozac_browser_toolbar_url_view))
-            .check(matches(withText(containsString(url.replace("http://", "")))))
+                .check(matches(withText(containsString(url.replace("http://", "")))))
+        }
     }
 
     fun verifyHelpUrl() {
@@ -79,11 +84,16 @@ class BrowserRobot {
     */
 
     fun verifyPageContent(expectedText: String) {
+        sessionLoadedIdlingResource = SessionLoadedIdlingResource()
+
         mDevice.waitNotNull(
             Until.findObject(By.res("org.mozilla.fenix.debug:id/engineView")),
             waitingTime
         )
-        assertTrue(mDevice.findObject(UiSelector().textContains(expectedText)).waitForExists(waitingTime))
+
+        runWithIdleRes(sessionLoadedIdlingResource) {
+            assertTrue(mDevice.findObject(UiSelector().textContains(expectedText)).waitForExists(waitingTime))
+        }
     }
 
     fun verifyTabCounter(expectedText: String) {
@@ -339,6 +349,8 @@ class BrowserRobot {
         )
         passwordField.waitForExists(waitingTime)
         passwordField.setText(password)
+        // wait until the password is hidden
+        assertTrue(mDevice.findObject(UiSelector().text(password)).waitUntilGone(waitingTime))
     }
 
     fun clickMediaPlayerPlayButton() {