third_party/WebKit/LayoutTests/fast/js/resources/getOwnPropertyDescriptor.js

   1 description("Test to ensure correct behaviour of Object.getOwnPropertyDescriptor");
   2
   3 function descriptorShouldBe(object, property, expected) {
   4     var test = 'Object.getOwnPropertyDescriptor('+object+", "+property+')';
   5     if ("writable" in expected) {
   6       //  shouldBe(test+'.writable', '' + expected.writable);
   7         shouldBe(test+'.value', '' + expected.value);
   8         shouldBeFalse(test+".hasOwnProperty('get')");
   9         shouldBeFalse(test+".hasOwnProperty('set')");
  10     } else {
  11         shouldBe(test+'.get', '' + expected.get);
  12         shouldBe(test+'.set', '' + expected.set);
  13         shouldBeFalse(test+".hasOwnProperty('value')");
  14         shouldBeFalse(test+".hasOwnProperty('writable')");
  15     }
  16     shouldBe(test+'.enumerable', '' + expected.enumerable);
  17     shouldBe(test+'.configurable', '' + expected.configurable);
  18 }
  19
  20 shouldBeUndefined("Object.getOwnPropertyDescriptor({}, 'undefinedProperty')");
  21 descriptorShouldBe("{definedProperty:'defined'}", "'definedProperty'", {writable: true, enumerable: true, configurable: true, value:'"defined"'});
  22 descriptorShouldBe("Array.prototype", "'concat'", {writable: true, enumerable: false, configurable: true, value:"Array.prototype.concat"});
  23 descriptorShouldBe("Date.prototype", "'toISOString'", {writable: true, enumerable: false, configurable: true, value: "Date.prototype.toISOString"});
  24 descriptorShouldBe("String.prototype", "'concat'", {writable: true, enumerable: false, configurable: true, value:"String.prototype.concat"});
  25 descriptorShouldBe("RegExp.prototype", "'exec'", {writable: true, enumerable: false, configurable: true, value:"RegExp.prototype.exec"});
  26 descriptorShouldBe("document.__proto__.__proto__", "'createElement'", {writable: true, enumerable: true, configurable: true, value:"document.createElement"});
  27 descriptorShouldBe("window", "'location'", {writable: false, enumerable: true, configurable: false, value: "window.location"});
  28 descriptorShouldBe("Number", "'NEGATIVE_INFINITY'", {writable: false, enumerable: false, configurable: false, value:"Number.NEGATIVE_INFINITY"});
  29 descriptorShouldBe("RegExp", "'$_'", {writable: true, enumerable: false, configurable: true, value:"RegExp.$_"});
  30 descriptorShouldBe("/a/g", "'global'", {writable: true, enumerable: false, configurable: false, value:true});
  31 descriptorShouldBe("Node", "'DOCUMENT_POSITION_DISCONNECTED'", {writable: false, enumerable: true, configurable: false, value:"Node.DOCUMENT_POSITION_DISCONNECTED"});
  32 descriptorShouldBe("Math", "'sin'", {writable: true, enumerable: false, configurable: true, value:"Math.sin"});
  33 descriptorShouldBe("[1,2,3]", "0", {writable: true, enumerable: true, configurable: true, value:"1"});
  34 descriptorShouldBe("[1,2,3]", "'length'", {writable: true, enumerable: false, configurable: false, value:"3"});
  35 descriptorShouldBe("[1,2,3]", "'length'", {writable: true, enumerable: false, configurable: false, value:"3"});
  36 descriptorShouldBe("/(a)*/g.exec('a')", "0", {writable: true, enumerable: true, configurable: true, value:"'a'"});
  37 descriptorShouldBe("/(a)*/g.exec('a')", "'length'", {writable: true, enumerable: false, configurable: false, value:2});
  38 descriptorShouldBe("function(){}", "'length'", {writable: false, enumerable: false, configurable: true, value:0});
  39 descriptorShouldBe("Math.sin", "'length'", {writable: false, enumerable: false, configurable: true, value:1});
  40 descriptorShouldBe("Math.sin", "'name'", {writable: false, enumerable: false, configurable: true, value:"'sin'"});
  41 var global = this;
  42 descriptorShouldBe("global", "'global'", {writable: true, enumerable: true, configurable: false, value:"global"});
  43 descriptorShouldBe("global", "'undefined'", {writable: false, enumerable: false, configurable: false, value:"undefined"});
  44 descriptorShouldBe("global", "'NaN'", {writable: false, enumerable: false, configurable: false, value:"NaN"});
  45 descriptorShouldBe("global", "'Infinity'", {writable: false, enumerable: false, configurable: false, value:"Infinity"});
  46 descriptorShouldBe("global", "'window'", {writable: false, enumerable: true, configurable: false, value:"global"});
  47 descriptorShouldBe("global", "'XMLHttpRequest'", {writable: true, enumerable: false, configurable: true, value:"XMLHttpRequest"});
  48 descriptorShouldBe("global", "'length'", {writable: true, enumerable: true, configurable: false, value:"global.length"});
  49 descriptorShouldBe("global", "0", {writable: true, enumerable: false, configurable: false, value:"global[0]"});
  50
  51 var objectWithGetter = {};
  52 function getterFunc(){};
  53 objectWithGetter.__defineGetter__("getter", getterFunc);
  54 descriptorShouldBe("objectWithGetter", "'getter'", {"get": "getterFunc", "set": undefined, enumerable: true, configurable: true});
  55 var objectWithSetter = {};
  56 function setterFunc(){};
  57 objectWithSetter.__defineSetter__("setter", setterFunc);
  58 descriptorShouldBe("objectWithSetter", "'setter'", {"set": "setterFunc", "get": undefined, enumerable: true, configurable: true});
  59 var objectWithAccessor = {};
  60 objectWithAccessor.__defineSetter__("accessor", setterFunc);
  61 objectWithAccessor.__defineGetter__("accessor", getterFunc);
  62 descriptorShouldBe("objectWithAccessor", "'accessor'", {"set": "setterFunc", "get": "getterFunc", enumerable: true, configurable: true});
  63
  64 shouldThrow("Object.getOwnPropertyDescriptor(null)");
  65 shouldThrow("Object.getOwnPropertyDescriptor(undefined)");
  66 shouldBeUndefined("Object.getOwnPropertyDescriptor(1)");
  67 shouldBeUndefined("Object.getOwnPropertyDescriptor('')");
  68 shouldBeUndefined("Object.getOwnPropertyDescriptor(true)");
  69 shouldBeUndefined("Object.getOwnPropertyDescriptor(false)");
  70
  71 debug("Checking property ordering");
  72 var normalOrder = ["'value'", "'writable'", "'enumerable'", "'configurable'"];
  73 var accessorOrder = ["'get'", "'set'", "'enumerable'", "'configurable'"];
  74 var i = 0;
  75 for (var property in Object.getOwnPropertyDescriptor(Math, "sin"))
  76     shouldBe('property', normalOrder[i++]);
  77 i = 0;
  78 for (var property in Object.getOwnPropertyDescriptor(objectWithGetter, "getter"))
  79     shouldBe('property', accessorOrder[i++]);
  80 i = 0;
  81 for (var property in Object.getOwnPropertyDescriptor(objectWithSetter, "setter"))
  82     shouldBe('property', accessorOrder[i++]);
  83 i = 0;
  84 for (var property in Object.getOwnPropertyDescriptor(objectWithAccessor, "accessor"))
  85     shouldBe('property', accessorOrder[i++]);