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-rw-r--r--toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js26
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diff --git a/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js b/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js
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+++ b/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Test bug 420482 by making sure multiple consumers of DownloadUtils gets the
+ * same time remaining time if they provide the same time left but a different
+ * "last time".
+ */
+
+var Cu = Components.utils;
+Cu.import("resource://gre/modules/DownloadUtils.jsm");
+
+function run_test()
+{
+ // Simulate having multiple downloads requesting time left
+ let downloadTimes = {};
+ for (let time of [1, 30, 60, 3456, 9999])
+ downloadTimes[time] = DownloadUtils.getTimeLeft(time)[0];
+
+ // Pretend we're a download status bar also asking for a time left, but we're
+ // using a different "last sec". We need to make sure we get the same time.
+ let lastSec = 314;
+ for (let [time, text] of Object.entries(downloadTimes))
+ do_check_eq(DownloadUtils.getTimeLeft(time, lastSec)[0], text);
+}