Bug 1583043 - Wait for telemetry events before asserting in browser_entry_point_telemetry. r=jaws

Differential Revision: https://phabricator.services.mozilla.com/D47101

--HG--
extra : moz-landing-system : lando

toolkit/components/passwordmgr/test/LoginTestUtils.jsm

@@ -538,10 +538,11 @@ this.LoginTestUtils.telemetry = {
         Ci.nsITelemetry.DATASET_PRERELEASE_CHANNELS,
         false
       )[process];
-      dump(`events: ${JSON.stringify(events, null, 2)}\n`);
+
       if (!events) {
         return null;
       }
+
       events = events.filter(e => e[1] == category);
       return events.length == count ? events : null;
     }, "waiting for telemetry event count of: " + count);

toolkit/components/passwordmgr/test/browser/browser_entry_point_telemetry.js

@@ -43,6 +43,7 @@ add_task(async function mainMenu_entryPoint() {
   let passwordManager = await openPasswordManager(openingFunc);
   info("mainMenu_entryPoint, password manager dialog shown");
 
+  await LoginTestUtils.telemetry.waitForEventCount(1);
   TelemetryTestUtils.assertEvents(
     [["pwmgr", "open_management", "mainmenu"]],
     {