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diff --git a/dom/base/test/test_setInterval_uncatchable_exception.html b/dom/base/test/test_setInterval_uncatchable_exception.html
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+++ b/dom/base/test/test_setInterval_uncatchable_exception.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1252268
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 1252268</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1252268">Mozilla Bug 1252268</a>
+
+<script type="text/javascript">
+ function go() {
+ SimpleTest.requestFlakyTimeout("I'm smarter than the test harness");
+
+ var ranOnce = false;
+ var finished = false;
+
+ var interval = setInterval(function () {
+ if (ranOnce) {
+ ok(false, "Don't execute me again!");
+ clearInterval(interval);
+ if (!finished) {
+ finished = true;
+ SimpleTest.finish();
+ }
+ } else {
+ ranOnce = true;
+ ok(true, "Ran the first time");
+ try {
+ TestFunctions.throwUncatchableException();
+ ok(false, "How did we get here!");
+ } catch (e) {
+ ok(false, "How did we get here!?");
+ }
+ }
+ }, 100);
+
+ setTimeout(function() {
+ if (!finished) {
+ finished = true;
+ SimpleTest.finish();
+ }
+ }, 1000);
+ }
+
+ SimpleTest.waitForExplicitFinish();
+ SpecialPowers.pushPrefEnv({set: [['dom.expose_test_interfaces', true]]}, go);
+</script>
+
+</body>
+</html>