test_sessionStorageUsage.html

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<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title>sessionStorage basic test</title>

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

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

<script type="text/javascript">

function setup() {

  sessionStorage.clear();

  SimpleTest.executeSoon(startTest);

function startTest()

  var util = SpecialPowers.getDOMWindowUtils(window);

  // Check initial state.

  is(sessionStorage.length, 0, "storage is empty");

  is(util.getStorageUsage(sessionStorage), 0, "usage is zero");

  // Add some data.

  sessionStorage.setItem("one", "data");

  var usage = util.getStorageUsage(sessionStorage);

  ok(usage > 0, "storage contains data");

  // Add some more data.

  sessionStorage.setItem("two", "data");

  ok(usage < util.getStorageUsage(sessionStorage), "storage size grew");

  // Remove data.

  sessionStorage.removeItem("two");

  is(util.getStorageUsage(sessionStorage), usage, "storage size shrunk");

  // Cleanup.

  sessionStorage.clear();

  is(sessionStorage.length, 0, "storage is empty");

  is(util.getStorageUsage(sessionStorage), 0, "usage is zero");

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

</script>

</head>

<body onload="setup();">

</body>

</html>