1 files changed, 44 insertions, 0 deletions
diff --git a/toolkit/components/timermanager/tests/unit/test_skipFirst.js b/toolkit/components/timermanager/tests/unit/test_skipFirst.js
new file mode 100644
index 0000000000..fec1a795ed
--- /dev/null
+++ b/toolkit/components/timermanager/tests/unit/test_skipFirst.js
@@ -0,0 +1,44 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+"use strict";
+
+const { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "gUpdateTimerManager",
+  "@mozilla.org/updates/timer-manager;1",
+  "nsIUpdateTimerManager"
+);
+
+const PREF_APP_UPDATE_LASTUPDATETIME_FMT = "app.update.lastUpdateTime.%ID%";
+
+add_task(async function () {
+  const testId = "test_timer_id";
+  const testPref = PREF_APP_UPDATE_LASTUPDATETIME_FMT.replace(/%ID%/, testId);
+  const testInterval = 100000000; // Just needs to be longer than the test.
+
+  Services.prefs.clearUserPref(testPref);
+  gUpdateTimerManager.registerTimer(
+    testId,
+    {},
+    testInterval,
+    true /* skipFirst */
+  );
+  let prefValue = Services.prefs.getIntPref(testPref, 0);
+  Assert.notEqual(
+    prefValue,
+    0,
+    "Last update time for test timer must not be 0."
+  );
+  let nowSeconds = Date.now() / 1000; // update timer lastUpdate prefs are set in seconds.
+  Assert.ok(
+    Math.abs(nowSeconds - prefValue) < 2,
+    "Last update time for test timer must be now-ish."
+  );
+
+  gUpdateTimerManager.unregisterTimer(testId);
+});