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[1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
[2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
[3] http://www.w3.org/2004/10/27-testcases
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<html>
<head>
<meta charset="utf-8">
<title>Object.preventExtensions</title>
<link rel="author" title="Masaya Iseki" href="mailto:iseki.m.aa@gmail.com">
<link rel="help" href="https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.preventextensions">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
test(function() {
[{}, []].forEach(function(that){
assert_true(Object.isExtensible(that));
that.prop = 'exist';
Object.preventExtensions(that);
assert_false(Object.isExtensible(that));
assert_false(Object.isFrozen(that));
assert_false(Object.isSealed(that));
that.extension = 'This property should not be added';
assert_equals(undefined, that.extension, 'Confirm to prevent adding property.');
that.prop = 'changed';
assert_equals('changed', that.prop,
'Confirm to be able to change a property value.');
delete that.prop;
assert_equals(undefined, that.prop, 'Confirm to be able to delete a property.');
});
});
test(function() {
['foo', 42, null, undefined].forEach(function(that) {
assert_throws(new TypeError(),
function() { Object.preventExtensions(that) });
});
});
</script>
</body>
</html>
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