JSTests/ChakraCore/test/es6/set_basic.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------

// Basic Set tests -- verifies the API shape

WScript.LoadScriptFile("..\\UnitTestFramework\\UnitTestFramework.js");

var tests = [
    {
        name: "Set is a constructor on the global object",
        body: function () {
            assert.isTrue(Set !== undefined, "Set should be defined");

            var set1 = new Set();
            // Set is no longer allowed to be called as a function unless the object it is given
            // for its this argument already has the [[SetData]] property on it.
            // TODO: When we implement @@create support, update this test to reflect it.
            //var set2 = Set();

            assert.isTrue(set1 instanceof Set, "'new Set()' should create a Set object");
            //assert.isTrue(set2 instanceof Set, "'Set()' should also create a Set object");
            //assert.isTrue(set1 !== set2, "Should be two different Set objects");

            assert.areEqual(0, Set.length, "Set takes one optional argument and spec says length must be 0");
        }
    },
    {
        name: "Set.prototype should have spec defined built-ins",
        body: function () {
            assert.isTrue(Set.prototype.constructor === Set, "Set.prototype should have a constructor property set to Set");

            assert.isTrue(Set.prototype.hasOwnProperty('add'), "Set.prototype should have an add method");
            assert.isTrue(Set.prototype.hasOwnProperty('clear'), "Set.prototype should have a clear method");
            assert.isTrue(Set.prototype.hasOwnProperty('delete'), "Set.prototype should have a delete method");
            assert.isTrue(Set.prototype.hasOwnProperty('forEach'), "Set.prototype should have a forEach method");
            assert.isTrue(Set.prototype.hasOwnProperty('has'), "Set.prototype should have a has method");
            assert.isTrue(Set.prototype.hasOwnProperty('size'), "Set.prototype should have a size accessor");

            assert.isTrue(Set.prototype.add.length === 1, "add method takes one argument");
            assert.isTrue(Set.prototype.clear.length === 0, "clear method takes zero arguments");
            assert.isTrue(Set.prototype.delete.length === 1, "delete method takes one argument");
            assert.isTrue(Set.prototype.forEach.length === 1, "forEach method takes two arguments but second is optional and spec says length must be 1");
            assert.isTrue(Set.prototype.has.length === 1, "has method takes one argument");

            assert.isTrue(Object.getOwnPropertyDescriptor(Set.prototype, 'size').get !== undefined, "size accessor should have get method");
            assert.isTrue(Object.getOwnPropertyDescriptor(Set.prototype, 'size').set === undefined, "size accessor should not have set method");
        }
    },
    {
        name: "Set objects' prototype should be Set.prototype",
        body: function () {
            var set1 = new Set();
            // Set is no longer allowed to be called as a function unless the object it is given
            // for its this argument already has the [[SetData]] property on it.
            // TODO: When we implement @@create support, update this test to reflect it.
            //var set2 = Set();

            assert.isTrue(Object.getPrototypeOf(set1) === Set.prototype, "'new Set()' should set the prototype of the returned object to Set.prototype");
            //assert.isTrue(Object.getPrototypeOf(set2) === Set.prototype, "'Set()' should set the prototype of the returned object to Set.prototype");
        }
    },
    {
        name: "toString of a Set object returns [object Set]",
        body: function () {
            var set = new Set();

            assert.areEqual("[object Set]", '' + set, "toString() of map returns [object Set]");
        }
    },
    {
        name: "Set objects are normal extensible dynamic objects",
        body: function () {
            function countEnumerableProperties(o) {
                var count = 0;
                for (p in o) {
                    count += 1;
                }
                return count;
            }

            var set = new Set();

            assert.isTrue(countEnumerableProperties(Set.prototype) == 0, "Built-in methods should not be enumerable on the prototype object");
            assert.isTrue(countEnumerableProperties(set) == 0, "Built-in methods should not be enumerable on an instance object");

            set.foo = 10;
            set.bar = 'hello';

            assert.isTrue(countEnumerableProperties(set) == 2, "Should be able to add user properties");
            assert.isTrue(set.foo === 10, "Property value should be set and retrieved correctly");
            assert.isTrue(set.bar === 'hello', "Property value should be set and retrieved correctly");

            delete set.foo;
            assert.isTrue(countEnumerableProperties(set) == 1, "Should be able to delete user properties");
            assert.isTrue(set.foo === undefined, "Should be able to delete user properties");
        }
    },
    {
        name: "Set is subclassable",
        body: function () {
            // Set is no longer allowed to be called as a function unless the object it is given
            // for its this argument already has the [[SetData]] property on it.
            // TODO: When we implement @@create support, update this test to reflect it.
            //
            // For IE11 we simply throw if Set() is called as a function instead of in a new expression
            assert.throws(function () { Set.call(); }, TypeError, "Set.call() throws TypeError");
            assert.throws(function () { Set.call({ }); }, TypeError, "Set.call() throws TypeError given an object");
            assert.throws(function () { Set.call(123); }, TypeError, "Set.call() throws TypeError given a number");
            assert.throws(function () { Set.call("hello"); }, TypeError, "Set.call() throws TypeError given a string");

            function MySet() {
                Set.call(this);
            }
            MySet.prototype = new Set();
            MySet.prototype.constructor = MySet;

            assert.throws(function () { var mymap = new MySet(); }, TypeError, "Set.call(this) throws TypeError when used in the old subclassing pattern");
            /*
            function MySet() {
                Set.call(this);
            }
            MySet.prototype = new Set();
            MySet.prototype.constructor = MySet;

            var myset = new MySet();

            assert.isTrue(myset instanceof MySet, "Should be a MySet object");
            assert.isTrue(myset instanceof Set, "Should also be a Set object");
            assert.isTrue(Object.getPrototypeOf(myset) === MySet.prototype, "Should have MySet prototype");
            assert.isTrue(Object.getPrototypeOf(myset) !== Set.prototype, "Should be distinct from Set prototype");

            assert.isTrue(myset.add instanceof Function, "Should have add method");
            assert.isTrue(myset.clear instanceof Function, "Should have clear method");
            assert.isTrue(myset.delete instanceof Function, "Should have delete method");
            assert.isTrue(myset.forEach instanceof Function, "Should have forEach method");
            assert.isTrue(myset.has instanceof Function, "Should have has method");
            assert.isTrue(myset.size === 0, "Should have size getter (initially zero)");
            */
        }
    },
];

testRunner.runTests(tests, { verbose: WScript.Arguments[0] != "summary" });