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23
24description("This test checks the behavior of [[DefineOwnProperty]] applied to Array objects (see ES5.1 15.4.5.1).");
25
26// Test that properties other than length, array indices are handled as normal.
27shouldBeTrue("Object.defineProperty([], 'x', { get:function(){return true;} }).x");
28
29// The length property can be set, and can be made read-only.
30shouldBe("Object.defineProperty([], 'length', { value: 1 }).length", '1');
31shouldBe("var a = Object.defineProperty([], 'length', { writable: false }); a[1] = 1; a.length", '0');
32shouldBe("var a = Object.defineProperty([], 'length', { writable: false }); a.length = 1; a.length", '0');
33// If writable is not specified, it should not change.
34shouldBe("var a = Object.defineProperty([], 'length', {}); a.length = 1; a.length", '1');
35
36// The length property can be replaced with an accessor, or made either enumerable or configurable.
37shouldThrow("Object.defineProperty([], 'length', { get:function(){return true;} })");
38shouldThrow("Object.defineProperty([], 'length', { enumerable: true })");
39shouldThrow("Object.defineProperty([], 'length', { configurable: true })");
40shouldThrow("Object.defineProperty(Object.defineProperty([], 'length', { writable: false }), 'length', { writable: true })");
41
42// The value of an indexed property can be set.
43shouldBe("var a = Object.defineProperty([], '0', { value: 42 }); a[0]", '42');
44// An indexed property can be made non-writable/enumerable/configurable.
45shouldBe("var a = Object.defineProperty([42], '0', { writable: false }); a[0] = 1; a[0]", '42');
46shouldBe("var a = Object.defineProperty([42], '0', { enumerable: false }); a[0] + Object.keys(a).length", '42');
47shouldBe("var a = Object.defineProperty([42], '0', { configurable: false }); a.length = 0; a[0]", '42');
48// An indexed property can be defined as an accessor.
49shouldBe("var foo = 0; Object.defineProperty([], '0', { set:function(x){foo = x;} })[0] = 42; foo", '42');
50shouldBeTrue("Object.defineProperty([], '0', { get:function(){return true;} })[0]")
51// A configurable, non-writable property can be made writable, but a non-configurable one cannot.
52shouldBeTrue("Object.defineProperty(Object.defineProperty([true], '0', { configurable:true, writable: false }), '0', { writable: true })[0]");
53shouldThrow("Object.defineProperty(Object.defineProperty([true], '0', { configurable:false, writable: false }), '0', { writable: true })[0]");
54
55// Reassigning the value is okay if the property is writable.
56shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: 1, writable:true }), '0', { value: 2 })[0]", '2');
57// Reassigning the value is okay if the value doesn't change.
58shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: 1 }), '0', { value: 1 })[0]", '1');
59shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: Number.NaN }), '0', { value: -Number.NaN })[0]", 'Number.NaN');
60shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: 'okay'.substring(0,2) }), '0', { value: 'not ok'.substring(4,6) })[0]", '"ok"');
61shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: true }), '0', { value: true })[0]", 'true');
62shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: false }), '0', { value: false })[0]", 'false');
63shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: null }), '0', { value: null })[0]", 'null');
64shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: undefined }), '0', { value: undefined })[0]", 'undefined');
65shouldBe("Object.defineProperty(Object.defineProperty([], '0', { value: Math }), '0', { value: Math })[0]", 'Math');
66// Reassigning the value is not okay if the value changes.
67shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: 1 }), '0', { value: 2 })[0]");
68shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: 'okay' }), '0', { value: 'not ok' })[0]");
69shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: true }), '0', { value: false })[0]");
70shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: false }), '0', { value: true })[0]");
71shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: Math }), '0', { value: Object })[0]");
72// Reassigning the value is not okay if the type changes.
73shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: null }), '0', { value: undefined })[0]");
74shouldThrow("Object.defineProperty(Object.defineProperty([], '0', { value: undefined }), '0', { value: null })[0]");
75
76Object.defineProperty(Array.prototype, "0", { set: function () { throw false; } });
77Object.defineProperty(Array.prototype, "1", { set: function () { throw false; } });
78var arrObj = [ , false ];
79Object.defineProperty(arrObj, "0", { set: function (x) { this.set = x === 42; } });
80shouldBeTrue("arrObj[0] = 42; arrObj.set;");
81shouldBeTrue("arrObj[1] = true; arrObj[1];");
82
83successfullyParsed = true;
84