source: trip-planner-front/node_modules/define-properties/test/index.js@ 188ee53

'use strict';

var define = require('../');
var test = require('tape');
var keys = require('object-keys');

var arePropertyDescriptorsSupported = function () {
        var obj = { a: 1 };
        try {
                Object.defineProperty(obj, 'x', { value: obj });
                return obj.x === obj;
        } catch (e) { /* this is IE 8. */
                return false;
        }
};
var descriptorsSupported = !!Object.defineProperty && arePropertyDescriptorsSupported();

var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';

test('defineProperties', function (dt) {
        dt.test('with descriptor support', { skip: !descriptorsSupported }, function (t) {
                var getDescriptor = function (value) {
                        return {
                                configurable: true,
                                enumerable: false,
                                value: value,
                                writable: true
                        };
                };

                var obj = {
                        a: 1,
                        b: 2,
                        c: 3
                };
                t.deepEqual(keys(obj), ['a', 'b', 'c'], 'all literal-set keys start enumerable');
                define(obj, {
                        b: 3,
                        c: 4,
                        d: 5
                });
                t.deepEqual(obj, {
                        a: 1,
                        b: 2,
                        c: 3
                }, 'existing properties were not overridden');
                t.deepEqual(Object.getOwnPropertyDescriptor(obj, 'd'), getDescriptor(5), 'new property "d" was added and is not enumerable');
                t.deepEqual(['a', 'b', 'c'], keys(obj), 'new keys are not enumerable');

                define(obj, {
                        a: 2,
                        b: 3,
                        c: 4
                }, {
                        a: function () { return true; },
                        b: function () { return false; }
                });
                t.deepEqual(obj, {
                        b: 2,
                        c: 3
                }, 'properties only overriden when predicate exists and returns true');
                t.deepEqual(Object.getOwnPropertyDescriptor(obj, 'd'), getDescriptor(5), 'existing property "d" remained and is not enumerable');
                t.deepEqual(Object.getOwnPropertyDescriptor(obj, 'a'), getDescriptor(2), 'existing property "a" was overridden and is not enumerable');
                t.deepEqual(['b', 'c'], keys(obj), 'overridden keys are not enumerable');

                t.end();
        });

        dt.test('without descriptor support', { skip: descriptorsSupported }, function (t) {
                var obj = {
                        a: 1,
                        b: 2,
                        c: 3
                };
                define(obj, {
                        b: 3,
                        c: 4,
                        d: 5
                });
                t.deepEqual(obj, {
                        a: 1,
                        b: 2,
                        c: 3,
                        d: 5
                }, 'existing properties were not overridden, new properties were added');

                define(obj, {
                        a: 2,
                        b: 3,
                        c: 4
                }, {
                        a: function () { return true; },
                        b: function () { return false; }
                });
                t.deepEqual(obj, {
                        a: 2,
                        b: 2,
                        c: 3,
                        d: 5
                }, 'properties only overriden when predicate exists and returns true');

                t.end();
        });

        dt.end();
});

test('symbols', { skip: !hasSymbols }, function (t) {
        var sym = Symbol('foo');
        var obj = {};
        var aValue = {};
        var bValue = {};
        var properties = { a: aValue };
        properties[sym] = bValue;

        define(obj, properties);

        t.deepEqual(Object.keys(obj), [], 'object has no enumerable keys');
        t.deepEqual(Object.getOwnPropertyNames(obj), ['a'], 'object has non-enumerable "a" key');
        t.deepEqual(Object.getOwnPropertySymbols(obj), [sym], 'object has non-enumerable symbol key');
        t.equal(obj.a, aValue, 'string keyed value is defined');
        t.equal(obj[sym], bValue, 'symbol keyed value is defined');

        t.end();
});