1 /// Copyright (c) 2009 Microsoft Corporation
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3 /// Redistribution and use in source and binary forms, with or without modification, are permitted provided
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4 /// that the following conditions are met:
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5 /// * Redistributions of source code must retain the above copyright notice, this list of conditions and
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6 /// the following disclaimer.
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7 /// * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
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8 /// the following disclaimer in the documentation and/or other materials provided with the distribution.
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9 /// * Neither the name of Microsoft nor the names of its contributors may be used to
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10 /// endorse or promote products derived from this software without specific prior written permission.
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12 /// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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13 /// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 /// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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15 /// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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16 /// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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17 /// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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18 /// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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19 /// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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22 Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
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23 of O to define the property. Step 6 of [[DefineOwnProperty]] returns if
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24 every field of desc also occurs in current and every field in desc has
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25 the same value as current.
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28 ES5Harness.registerTest( {
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31 path: "TestCases/chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-6.js",
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33 description: "Object.defineProperty is no-op if current and desc are the same accessor desc",
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35 test: function testcase() {
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36 function sameAccessorDescriptorValues(d1, d2) {
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37 return (d1.get == d2.get &&
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38 d1.enumerable == d2.enumerable &&
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39 d1.configurable == d2.configurable);
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44 // create an accessor property with the following attributes:
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45 // enumerable: true, configurable: true
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47 get: function () {},
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52 Object.defineProperty(o, "foo", desc);
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54 // query for, and save, the desc. A subsequent call to defineProperty
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55 // with the same desc should not disturb the property definition.
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56 var d1 = Object.getOwnPropertyDescriptor(o, "foo");
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58 // now, redefine the property with the same descriptor
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59 // the property defintion should not get disturbed.
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60 Object.defineProperty(o, "foo", desc);
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62 var d2 = Object.getOwnPropertyDescriptor(o, "foo");
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64 if (sameAccessorDescriptorValues(d1, d2) === true) {
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69 precondition: function prereq() {
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70 return fnExists(Object.defineProperty) && fnExists(Object.getOwnPropertyDescriptor);
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