js/xpconnect/tests/mochitest/test_getweakmapkeys.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=688277
   5 -->
   6 <head>
   7   <meta charset="utf-8">
   8   <title>Tests for nondeterministicGetWeakMapKeys</title>
   9   <script src="/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  11   <script type="application/javascript">
  12   /** Test for Bug 688277 **/
  13
  14   /* Fail gracefully if junk is passed in. */
  15   is(SpecialPowers.nondeterministicGetWeakMapKeys(11), undefined,
  16     "nondeterministicGetWeakMapKeys should return undefined for non-objects");
  17   is(SpecialPowers.nondeterministicGetWeakMapKeys({}), undefined,
  18     "nondeterministicGetWeakMapKeys should return undefined for non-weakmap objects");
  19   is(SpecialPowers.nondeterministicGetWeakMapKeys(null), undefined,
  20     "nondeterministicGetWeakMapKeys should return undefined for null");
  21
  22   /* return an empty array for an empty WeakMap */
  23   let mempty = new WeakMap();
  24   is(SpecialPowers.nondeterministicGetWeakMapKeys(mempty).length, 0,
  25     "nondeterministicGetWeakMapKeys should return empty array for empty weakmap");
  26
  27   /* Test freeing/nonfreeing. */
  28   let m = new WeakMap();
  29   let liveKeys = new Array();
  30
  31   let add_elements = function () {
  32     let k1 = {};
  33     m.set(k1, "live1");
  34     liveKeys.push(k1);
  35
  36     let k2 = {};
  37     m.set(k2, "dead1");
  38
  39     let k = {};
  40     m.set(k, k); /* simple cycle */
  41   };
  42
  43   add_elements();
  44
  45   SpecialPowers.exactGC(function () {
  46     let keys = SpecialPowers.nondeterministicGetWeakMapKeys(m);
  47     is(liveKeys.length, 1, "Wrong number of live keys.");
  48     is(keys.length, 1, "Should have one weak map key.");
  49     is(m.get(keys[0]), "live1", "live1 should be live");
  50     SimpleTest.finish();
  51   });
  52
  53   SimpleTest.waitForExplicitFinish();
  54   </script>
  55 </head>
  56 <body>
  57 <p id="display"></p>
  58 </body>
  59 </html>