| <!doctype html> |
| <!-- |
| Distributed under both the W3C Test Suite License [1] and the W3C |
| 3-clause BSD License [2]. To contribute to a W3C Test Suite, see the |
| policies and contribution forms [3]. |
| |
| [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 |
| --> |
| <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> |