Set-surfaces-1.js - mozsearch

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// Set surfaces

load(libdir + "iteration.js");

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

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

assertEq(desc.writable, true);

assertEq(typeof Set, 'function');

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

assertEq(Set.length, 0);

assertEq(Set.name, "Set");

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

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

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

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

assertEq(Set.prototype.constructor, Set);

function checkMethod(name, arity) {

    var desc = Object.getOwnPropertyDescriptor(Set.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("has", 1);

checkMethod("add", 1);

checkMethod("delete", 1);

checkMethod("values", 0);

checkMethod("entries", 0);

var desc = Object.getOwnPropertyDescriptor(Set.prototype, "size");

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

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

assertEq(desc.get.length, 0);

assertEq(desc.set, undefined);

checkMethod("clear", 0);

// Set.prototype.keys, .values, and .iterator are the same function object

assertEq(Set.prototype.keys, Set.prototype.values);

assertEq(Set.prototype[Symbol.iterator], Set.prototype.values);