JSTests/ChakraCore/test/Object/toLocaleString2.js

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

// Object.prototype.toLocaleString tests for ES6 behaviors

if (this.WScript && this.WScript.LoadScriptFile) { // Check for running in ch
    this.WScript.LoadScriptFile("..\\UnitTestFramework\\UnitTestFramework.js");
}

var toLocaleString = Object.prototype.toLocaleString;

var tests = [
    {
        name: "Simple error cases for Object#toLocaleString",
        body: function () {
            assert.throws(function() { toLocaleString.call(); }, TypeError, "Object#toLocaleString throws when called with no parameters", "Object.prototype.toLocaleString: 'this' is null or undefined");
            assert.throws(function() { toLocaleString.call(undefined); }, TypeError, "Object#toLocaleString throws when called with undefined this parameter", "Object.prototype.toLocaleString: 'this' is null or undefined");
            assert.throws(function() { toLocaleString.call(null); }, TypeError, "Object#toLocaleString throws when called with null this parameter", "Object.prototype.toLocaleString: 'this' is null or undefined");
        }
    },
    {
        name: "Corner error cases for Object#toLocaleString",
        body: function () {
            var o = { toString : 'non-object' };
            assert.throws(function() { toLocaleString.call(o); }, TypeError, "Object#toLocaleString tries to get the 'toString' property from the this parameter of object with non-object toString property", "Object.prototype.toLocaleString: argument is not a Function object");

            o = { get toString() { throw TypeError('get toString'); } };
            assert.throws(function() { toLocaleString.call(o); }, TypeError, "Object#toLocaleString tries to get the 'toString' property from the this parameter of object with throwing accessor toString property", "get toString");
            
            o = { get toString() { return 'non-object'; } };
            assert.throws(function() { toLocaleString.call(o); }, TypeError, "Object#toLocaleString tries to get the 'toString' property from the this parameter of object with accessor toString property which returns non-function", "Object.prototype.toLocaleString: argument is not a Function object");
            
            o = Object.create(null); // o doesn't have Object.prototype.toString
            assert.throws(function() { toLocaleString.call(o); }, TypeError, "Object#toLocaleString tries to get the 'toString' property from the this parameter of object without toString property", "Object.prototype.toLocaleString: argument is not a Function object");
            
            o = { 
                toString() { 
                    assert.areEqual(o, this, "This argument passed to toString function should be the same object passed to toLocaleString");
                    throw TypeError('toString'); 
                } 
            };
            assert.throws(function() { toLocaleString.call(o); }, TypeError, "Object#toLocaleString tries to call the 'toString' property from the this parameter of object with toString function that throws", "toString");
        }
    },
    {
        name: "Object#toLocaleString passes the this argument as-is to the toString function we load from ToObject(this)",
        body: function () {
            'use strict';
            Boolean.prototype.toString = function() { return typeof this; }; // we will walk up to here from Object(true) before we find Object.prototype.toString
            assert.areEqual('boolean', true.toLocaleString(), "Calling Object#toLocaleString with a primitive this argument performs ToObject(this).toString.call(this) which will call the function we added to Boolean#toString");
            assert.areEqual('boolean', toLocaleString.call(false), "Calling Object#toLocaleString with a primitive this argument performs ToObject(this).toString.call(this) which will call the function we added to Boolean#toString - even if we apply/call it");
            
            assert.areEqual('5', toLocaleString.call(5), "Calling Object#toLocaleString with a primitive this argument performs ToObject(this).toString.call(this) which will call Object#toString(5)");
            
            Object.defineProperty(Boolean.prototype, "toString", { get: function() { return () => typeof this; }});
            assert.areEqual('boolean', true.toLocaleString(), "Calling Object#toLocaleString with a primitive this argument performs ToObject(this).toString.call(this) which will call the function we added to Boolean#toString");
            assert.areEqual('boolean', toLocaleString.call(false), "Calling Object#toLocaleString with a primitive this argument performs ToObject(this).toString.call(this) which will call the function we added to Boolean#toString - even if we apply/call it");
        }
    },
];

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