55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
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var identity = function (x) { return x; };
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describe('Function', function () {
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describe('#name', function () {
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it('returns the name for named functions', function () {
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var foo = function bar() {};
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expect(foo.name).to.equal('bar');
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// pre-ES6, this property is nonconfigurable.
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var configurable = Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(foo, 'name').configurable : false;
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expect(foo).to.have.ownPropertyDescriptor('name', {
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configurable: !!configurable,
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enumerable: false,
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writable: false,
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value: 'bar'
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});
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});
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it('returns empty string for anonymous functions', function () {
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var anon = identity(function () {});
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expect(anon.name).to.equal('');
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// pre-ES6, this property is nonconfigurable.
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var configurable = Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(anon, 'name').configurable : false;
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expect(anon).to.have.ownPropertyDescriptor('name', {
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configurable: !!configurable,
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enumerable: false,
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writable: false,
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value: ''
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});
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});
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it('returns "anomymous" for Function functions', function () {
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/* eslint no-new-func: 1 */
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/* jshint evil: true */
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var func = identity(Function(''));
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/* jshint evil: false */
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expect(typeof func.name).to.equal('string');
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expect(func.name === 'anonymous' || func.name === '').to.equal(true);
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// pre-ES6, this property is nonconfigurable.
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var configurable = Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(func, 'name').configurable : false;
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expect(func).to.have.ownPropertyDescriptor('name', {
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configurable: !!configurable,
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enumerable: false,
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writable: false,
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value: func.name
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});
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});
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});
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});
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