Bug 1577371 - Fix timezone range check in TelemetrySession unit test. r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D51032

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

toolkit/components/telemetry/tests/unit/test_TelemetrySession.js

@@ -266,12 +266,17 @@ function checkPayloadInfo(data, reason) {
     Date.parse(data.subsessionStartDate) >= Date.parse(data.sessionStartDate)
   );
   Assert.ok(data.profileSubsessionCounter >= data.subsessionCounter);
+
+  // According to https://en.wikipedia.org/wiki/List_of_UTC_time_offsets,
+  // UTC offsets range from -12 to +14 hours.
+  // Don't think the extremes of the range are affected by further
+  // daylight-savings adjustments, but it is possible.
   Assert.ok(
     data.timezoneOffset >= -12 * 60,
     "The timezone must be in a valid range."
   );
   Assert.ok(
-    data.timezoneOffset <= 12 * 60,
+    data.timezoneOffset <= 14 * 60,
     "The timezone must be in a valid range."
   );
 }