test_getweakmapkeys.html

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<html>

<head>

  <title>Test for SpecialPowers.nondeterministicGetWeakMapKeys</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

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<body>

<div id="content" class="testbody">

  <script type="text/javascript">

    var emptyMap = new WeakMap;

    is(SpecialPowers.nondeterministicGetWeakMapKeys(emptyMap).length, 0, "Empty map has no keys");

    var twoMap = new WeakMap;

    var x = {};

    var y = {};

    twoMap.set(x, 1);

    twoMap.set(y, 2);

    var twoMapKeys = SpecialPowers.nondeterministicGetWeakMapKeys(twoMap);

    is(twoMapKeys.length, 2, "Map with two things should have two keys");

    ok(twoMapKeys[0] == x || twoMapKeys[1] == x, "One of the keys should be x");

    ok(twoMapKeys[0] == y || twoMapKeys[1] == y, "One of the keys should be y");

  </script>

</div>

</body>

</html>