function-name.js - mozsearch

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function testFunctionName(f) {

    var name = f.name;

    f.name = 'g';

    assertEq(f.name, name);

    assertEq(delete f.name, true);

    assertEq(f.name, '');

    assertEq(f.hasOwnProperty('name'), false);

    f.name = 'g';

    assertEq(f.name, '');

    Object.defineProperty(f, 'name', {value: 'g'});

    assertEq(f.name, 'g');

function testFunctionNameStrict(f) {

    "use strict";

    var name = f.name;

    var error;

    try {

        f.name = 'g';

    } catch (e) {

        error = e;

    assertEq(f.name, name);

    assertEq(error instanceof TypeError, true);

    assertEq(delete f.name, true);

    assertEq(f.name, '');

    assertEq(f.hasOwnProperty('name'), false);

    error = null;

    try {

        f.name = 'g';

    } catch (e) {

        error = e;

    assertEq(f.name, '');

    assertEq(error instanceof TypeError, true);

    Object.defineProperty(f, 'name', {value: 'g'});

    assertEq(f.name, 'g');

assertEq(Object.getOwnPropertyDescriptor(Object, "name").writable, false);

assertEq(Object.getOwnPropertyDescriptor(Object, "name").enumerable, false);

assertEq(Object.getOwnPropertyDescriptor(Object, "name").configurable, true);

assertEq(Object.getOwnPropertyDescriptor(Object, "name").value, 'Object');

assertEq(Object.getOwnPropertyDescriptor(function f(){}, "name").writable, false);

assertEq(Object.getOwnPropertyDescriptor(function f(){}, "name").enumerable, false);

assertEq(Object.getOwnPropertyDescriptor(function f(){}, "name").configurable, true);

assertEq(Object.getOwnPropertyDescriptor(function f(){}, "name").value, 'f');

// Basic test ensuring that Object.defineProperty works on pristine function.

function f() {};

Object.defineProperty(f, 'name', {value: 'g'});

assertEq(f.name, 'g');

// .name behaves as expected on scripted function.

testFunctionName(function f(){});

testFunctionNameStrict(function f(){});

// .name behaves as expected on builtin function.

testFunctionName(Function.prototype.apply);

testFunctionNameStrict(Function.prototype.call);

// .name behaves as expected on self-hosted builtin function.

testFunctionName(Array.prototype.forEach);

testFunctionNameStrict(Array.prototype.some);

if (typeof reportCompare === "function")

    reportCompare(0, 0);