core-js/tests/unit-global/es.function.name.js

import { DESCRIPTORS } from '../helpers/constants.js';

if (DESCRIPTORS) {
  QUnit.test('Function#name', assert => {
    assert.true('name' in Function.prototype);
    assert.nonEnumerable(Function.prototype, 'name');
    function foo() { /* empty */ }
    assert.same(foo.name, 'foo');
    assert.same(function () { /* empty */ }.name, '');
    if (Object.freeze) {
      assert.same(Object.freeze(() => { /* empty */ }).name, '');
    }
    function bar() { /* empty */ }
    bar.toString = function () {
      throw new Error();
    };
    assert.notThrows(() => bar.name === 'bar', 'works with redefined `.toString`');
    const baz = Object(() => { /* empty */ });
    baz.toString = function () {
      return '';
    };
    assert.same(baz.name, '');

    assert.same(function /*
    multi-line comment */() { /* empty */ }.name, '');

    function /*
    multi-line comment */
    foobar() { /* empty */ }
    assert.same(foobar.name, 'foobar');

    function // simple-line comment
    foobaz() { /* empty */ }
    assert.same(foobaz.name, 'foobaz');

    function // simple-line comment
    /* multi-line comment */quux/*
    multi-line comment
    */() { /* empty */ }
    assert.same(quux.name, 'quux');
  });
}