fb6d7e17df
This change makes us compatible with Safari on not throwing when trying to add a property to a non-extensible object. Review URL: http://codereview.chromium.org/6712059 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
117 lines
3.4 KiB
JavaScript
117 lines
3.4 KiB
JavaScript
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Tests the Object.preventExtensions method - ES 15.2.3.10
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var obj1 = {};
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// Extensible defaults to true.
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assertTrue(Object.isExtensible(obj1));
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Object.preventExtensions(obj1);
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// Make sure the is_extensible flag is set.
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assertFalse(Object.isExtensible(obj1));
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obj1.x = 42;
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assertEquals(undefined, obj1.x);
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// Try adding a new element.
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obj1[1] = 42;
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assertEquals(undefined, obj1[1]);
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// Try when the object has an existing property.
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var obj2 = {};
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assertTrue(Object.isExtensible(obj2));
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obj2.x = 42;
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assertEquals(42, obj2.x);
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assertTrue(Object.isExtensible(obj2));
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Object.preventExtensions(obj2);
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assertEquals(42, obj2.x);
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obj2.y = 42;
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// obj2.y should still be undefined.
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assertEquals(undefined, obj2.y);
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// Make sure we can still write values to obj.x.
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obj2.x = 43;
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assertEquals(43, obj2.x)
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obj2.y = new function() { return 42; };
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// obj2.y should still be undefined.
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assertEquals(undefined, obj2.y);
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assertEquals(43, obj2.x)
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try {
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Object.defineProperty(obj2, "y", {value: 42});
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} catch (e) {
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assertTrue(/object is not extensible/.test(e));
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}
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// obj2.y should still be undefined.
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assertEquals(undefined, obj2.y);
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assertEquals(43, obj2.x);
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obj2[1] = 42;
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assertEquals(undefined, obj2[1]);
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var arr = new Array();
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arr[1] = 10;
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Object.preventExtensions(arr);
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arr[2] = 42;
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assertEquals(10, arr[1]);
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// We should still be able to change exiting elements.
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arr[1]= 42;
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assertEquals(42, arr[1]);
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// Test the the extensible flag is not inherited.
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var parent = {};
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parent.x = 42;
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Object.preventExtensions(parent);
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var child = Object.create(parent);
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// We should be able to add new properties to the child object.
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child.y = 42;
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// This should have no influence on the parent class.
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parent.y = 29;
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// Test that attributes on functions are also handled correctly.
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function foo() {
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return 42;
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}
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Object.preventExtensions(foo);
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foo.x = 29;
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assertEquals(undefined, foo.x);
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