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diff --git a/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
new file mode 100644
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+++ b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
@@ -0,0 +1,55 @@
+/* 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 448344 to make sure when we're in low minutes, we show both minutes
+ * and seconds; but continue to show only minutes when we have plenty.
+ */
+
+Components.utils.import("resource://gre/modules/DownloadUtils.jsm");
+
+/**
+ * Print some debug message to the console. All arguments will be printed,
+ * separated by spaces.
+ *
+ * @param [arg0, arg1, arg2, ...]
+ *        Any number of arguments to print out
+ * @usage _("Hello World") -> prints "Hello World"
+ * @usage _(1, 2, 3) -> prints "1 2 3"
+ */
+var _ = function(some, debug, text, to) {
+  print(Array.slice(arguments).join(" "));
+};
+
+_("Make an array of time lefts and expected string to be shown for that time");
+var expectedTimes = [
+  [1.1, "A few seconds remaining", "under 4sec -> few"],
+  [2.5, "A few seconds remaining", "under 4sec -> few"],
+  [3.9, "A few seconds remaining", "under 4sec -> few"],
+  [5.3, "5 seconds remaining", "truncate seconds"],
+  [1.1 * 60, "1 minute, 6 seconds remaining", "under 4min -> show sec"],
+  [2.5 * 60, "2 minutes, 30 seconds remaining", "under 4min -> show sec"],
+  [3.9 * 60, "3 minutes, 54 seconds remaining", "under 4min -> show sec"],
+  [5.3 * 60, "5 minutes remaining", "over 4min -> only show min"],
+  [1.1 * 3600, "1 hour, 6 minutes remaining", "over 1hr -> show min/sec"],
+  [2.5 * 3600, "2 hours, 30 minutes remaining", "over 1hr -> show min/sec"],
+  [3.9 * 3600, "3 hours, 54 minutes remaining", "over 1hr -> show min/sec"],
+  [5.3 * 3600, "5 hours, 18 minutes remaining", "over 1hr -> show min/sec"],
+];
+_(expectedTimes.join("\n"));
+
+function run_test()
+{
+  expectedTimes.forEach(function([time, expectStatus, comment]) {
+    _("Running test with time", time);
+    _("Test comment:", comment);
+    let [status, last] = DownloadUtils.getTimeLeft(time);
+
+    _("Got status:", status, "last:", last);
+    _("Expecting..", expectStatus);
+    do_check_eq(status, expectStatus);
+
+    _();
+  });
+}