Bug 1660392 - [l10nregistry] part10: Fix mozapps update test to await for gAppUpdater. r=application-update-reviewers,bytesized

Differential Revision: https://phabricator.services.mozilla.com/D121126

security/manager/ssl/tests/mochitest/browser/browser_clientAuthRememberService.js

@@ -187,9 +187,10 @@ add_task(async function testRememberedDecisionsUI() {
     "rememberedList has expected number of labels"
   );
 
-  // Some of the strings here are localized with Fluent, so they will only be
-  // available after the next refresh driver tick.
-  await new Promise(win.requestAnimationFrame);
+  await BrowserTestUtils.waitForCondition(
+    () => labels[10].textContent.length > 0,
+    "Localized label is populated"
+  );
 
   let expectedHosts = [
     "example.com",

toolkit/mozapps/update/tests/browser/head.js

@@ -664,7 +664,9 @@ function runAboutDialogUpdateTest(params, steps) {
     const { panelId, checkActiveUpdate, continueFile, downloadInfo } = step;
     return (async function() {
       await TestUtils.waitForCondition(
-        () => aboutDialog.gAppUpdater.selectedPanel?.id == panelId,
+        () =>
+          aboutDialog.gAppUpdater &&
+          aboutDialog.gAppUpdater.selectedPanel?.id == panelId,
         "Waiting for the expected panel ID: " + panelId,
         undefined,
         200