WeakMap-surfaces.js

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// WeakMap surfaces

var desc = Object.getOwnPropertyDescriptor(this, "WeakMap");

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

assertEq(desc.writable, true);

assertEq(typeof WeakMap, 'function');

assertEq(Object.keys(WeakMap).length, 0);

assertEq(WeakMap.length, 0);

assertEq(WeakMap.name, "WeakMap");

assertEq(Object.getPrototypeOf(WeakMap.prototype), Object.prototype);

assertEq(Object.prototype.toString.call(WeakMap.prototype), "[object WeakMap]");

assertEq(Object.prototype.toString.call(new WeakMap()), "[object WeakMap]");

assertEq(Object.keys(WeakMap.prototype).join(), "");

assertEq(WeakMap.prototype.constructor, WeakMap);

function checkMethod(name, arity) {

    var desc = Object.getOwnPropertyDescriptor(WeakMap.prototype, name);

    assertEq(desc.enumerable, false);

    assertEq(desc.configurable, true);

    assertEq(desc.writable, true);

    assertEq(typeof desc.value, 'function');

    assertEq(desc.value.name, name);

    assertEq(desc.value.length, arity);

checkMethod("get", 1);

checkMethod("has", 1);

checkMethod("set", 2);

checkMethod("delete", 1);