JSTests/ChakraCore/test/Basics/ie12ScriptFunctionToStrings.js

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

if (this.WScript && this.WScript.LoadScriptFile) { // Check for running in ch
    this.WScript.LoadScriptFile("..\\UnitTestFramework\\UnitTestFramework.js");
}
var tests = [
    {
        name: "function declaration test",
        body: function ()
        {
            eval("function \n\t\r foo() {var a = 5;}");
            assert.areEqual("function foo() {var a = 5;}", foo.toString(), "toString should remove all extra whitespace, new lines, tabs and carriage return before the open (");
        }
    },
    {
        name: "function assignment test",
        body: function ()
        {
            eval("var a = function \t\n\r\t foo() {var a = 5;}");
            assert.areEqual("function foo() {var a = 5;}", a.toString(), "toString should remove all extra whitespace, new lines, tabs and carriage return before the open (");
            a = function(i) {i++;}
            assert.areEqual("function (i) {i++;}", a.toString(), "toString should add a space if one does not exist");

        }
    },
    {
        name: "generator function declaration test",
        body: function ()
        {
            eval("function* \t\r\n  foo() {var a = 5;}");
            assert.areEqual("function* foo() {var a = 5;}", foo.toString(), "toString should remove all extra whitespace, new lines, tabs and carriage return before the open (");
            eval("function \t\r\n*\n\r\n \t foo() {var a = 5;}");
            assert.areEqual("function* foo() {var a = 5;}", foo.toString(), "toString should remove all extra whitespace,  new lines, tabs and carriage return before the open (");
        }
    },
    {
        name: "generator function assignment test",
        body: function ()
        {
            eval("var a = function* \t\n\r  \t foo() {var a = 5;}");
            assert.areEqual("function* foo() {var a = 5;}", a.toString(), "toString should remove all extra whitespace, new lines, tabs and carriage return before the open (");
            eval("var a = function \t\n\r  *  \t\n foo() {var a = 5;}");
            assert.areEqual("function* foo() {var a = 5;}", a.toString(), "toString should remove all extra whitespace, new lines, tabs and carriage return before the open (");
        }
    },
    {
        name: "Named function expression tests",
        body: function ()
        {
             eval("var o = { foo : function \n\t bar \t () {}}");
             eval("o.e = function \t qui \t () {}");
             assert.areEqual("function bar() {}",o.foo.toString(),"confirm that the foo identifier does not override the name bar ");
             assert.areEqual("function qui() {}",o.e.toString(),"confirm that the foo identifier does not override the name qui");
        }
   },
   {
        name: "function expression tests without names",
        body: function ()
        {
             eval("var o = { foo : function \n\t  \t () {}}");
             eval("o.e = function \t  \t () {}");
             assert.areEqual("function () {}",o.foo.toString(),"confirm that the foo identifier does not override the name bar ");
             assert.areEqual("function () {}",o.e.toString(),"confirm that the foo identifier does not override the name qui");
        }
   },
   {
        name: "internal function test",
        body: function ()
        {
             eval("function foo() { return foo.toString(); }");
             var a = foo;
             assert.areEqual("function foo() { return foo.toString(); }", a(),"confirm that even if we call toString internally it has no effect on the name")
        }
   },
   {
        name: "class method test",
        body: function ()
        {
             eval("var qux = class { constructor(){} static func(){} method(){} get getter(){} set setter(v){}}");
             var quxObj = new qux();
             assert.areEqual("constructor(){}",quxObj.constructor.toString(),"The constructor should have the toString  with name constructor");
             assert.areEqual("func(){}",qux.func.toString(),"the name should be func")
             assert.areEqual("method(){}",quxObj.method.toString(),"the name should be method")

             var oGet = Object.getOwnPropertyDescriptor(qux.prototype,"getter");
             var oSet = Object.getOwnPropertyDescriptor(qux.prototype,"setter");
             assert.areEqual("getter(){}",  oGet.get.toString(), "the name should be getter");
             assert.areEqual("setter(v){}", oSet.set.toString(), "the name should be setter");
             var qux = class {};
             var quxObj = new qux();
             // I left a space between closing ellipse ) and the opening bracket { because that's how all browsers do toString on runtime functions
             // Should this not be how other browsers do default constructor go to RuntimeCommon.h and change JS_DEFAULT_CTOR_DISPLAY_STRING
             assert.areEqual("constructor() {}",quxObj.constructor.toString(),"The constructor should have the toString with name constructor")
        }
   },
   {
        name: "shorthand method function test",
        body: function ()
        {
             var o = {['f']() {},g () {}};
             assert.areEqual("f() {}",o.f.toString());
        }
   },
   {
        name: "arrow function Test",
        body: function ()
        {
             var arrowDecl = () => {};
             assert.areEqual("() => {}",arrowDecl.toString(),"Make sure arrow functions remain unaffected by ie12 formatting");
        }
   }
];
testRunner.runTests(tests, { verbose: WScript.Arguments[0] != "summary" });