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-rw-r--r--js/xpconnect/tests/mochitest/test_bug793969.html53
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diff --git a/js/xpconnect/tests/mochitest/test_bug793969.html b/js/xpconnect/tests/mochitest/test_bug793969.html
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+++ b/js/xpconnect/tests/mochitest/test_bug793969.html
@@ -0,0 +1,53 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=793969
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 793969</title>
+ <script type="application/javascript" 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=793969">Mozilla Bug 793969</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 793969 **/
+function checkThrows(f, desc, skipMessageCheck) {
+ try {
+ f();
+ ok(false, "Should have thrown for " + desc);
+ } catch (e) {
+ ok(true, "threw correctly");
+ if (!skipMessageCheck)
+ ok(/denied/.exec(e) ||
+ /can't redefine non-configurable property/.exec(e),
+ "Correctly threw a security exception: " + e);
+ }
+}
+
+// NB: These sets will be no-ops (throw in strict mode) because setting an inherited readonly value prop has those semantics.
+checkThrows(function() { "use strict"; location.valueOf = 'hah'; }, 'Shadow with string', /* skipMessageCheck = */ true);
+checkThrows(function() { "use strict"; location.valueOf = function() { return {a: 'hah'};} }, 'Shadow with function', /* skipMessageCheck = */ true);
+checkThrows(function() { Object.defineProperty(location, 'valueOf', { value: function() { return 'hah'; } }); }, 'defineProperty with value');
+checkThrows(function() { delete location.valueOf; Object.defineProperty(location, 'valueOf', { value: function() { return 'hah'; } }); }, 'delete + defineProperty with value');
+checkThrows(function() { Object.defineProperty(location, 'valueOf', { get: function() { return 'hah'; } }); }, 'defineProperty with getter');
+checkThrows(function() { delete location.valueOf; Object.defineProperty(location, 'valueOf', { get: function() { return 'hah'; } }); }, 'delete + defineProperty with getter');
+
+Object.prototype.valueOf = function() { return 'hah'; };
+is(({}).valueOf(), 'hah', "Shadowing on Object.prototype works for vanilla objects");
+is(location.valueOf(), location, "Shadowing on Object.prototype and Location.prototype doesn't for location objects");
+
+location[Symbol.toPrimitive] = function() { return 'hah'; }
+is(location + "", location.toString(), "Should't be able to shadow with toPrimitive");
+
+</script>
+</pre>
+</body>
+</html>