source: imaps-frontend/node_modules/has-property-descriptors/test/index.js

'use strict';

var test = require('tape');

var hasPropertyDescriptors = require('../');

var sentinel = {};

test('hasPropertyDescriptors', function (t) {
        t.equal(typeof hasPropertyDescriptors, 'function', 'is a function');
        t.equal(typeof hasPropertyDescriptors.hasArrayLengthDefineBug, 'function', '`hasArrayLengthDefineBug` property is a function');

        var yes = hasPropertyDescriptors();
        t.test('property descriptors', { skip: !yes }, function (st) {
                var o = { a: sentinel };

                st.deepEqual(
                        Object.getOwnPropertyDescriptor(o, 'a'),
                        {
                                configurable: true,
                                enumerable: true,
                                value: sentinel,
                                writable: true
                        },
                        'has expected property descriptor'
                );

                Object.defineProperty(o, 'a', { enumerable: false, writable: false });

                st.deepEqual(
                        Object.getOwnPropertyDescriptor(o, 'a'),
                        {
                                configurable: true,
                                enumerable: false,
                                value: sentinel,
                                writable: false
                        },
                        'has expected property descriptor after [[Define]]'
                );

                st.end();
        });

        var arrayBug = hasPropertyDescriptors.hasArrayLengthDefineBug();
        t.test('defining array lengths', { skip: !yes || arrayBug }, function (st) {
                var arr = [1, , 3]; // eslint-disable-line no-sparse-arrays
                st.equal(arr.length, 3, 'array starts with length 3');

                Object.defineProperty(arr, 'length', { value: 5 });

                st.equal(arr.length, 5, 'array ends with length 5');

                st.end();
        });

        t.end();
});