source: frontend/node_modules/object.getownpropertydescriptors/test/tests.js

'use strict';

var mockProperty = require('mock-property');

module.exports = function (getDescriptors, t) {
        var enumDescriptor = {
                configurable: true,
                enumerable: false,
                value: true,
                writable: false
        };
        var writableDescriptor = {
                configurable: true,
                enumerable: true,
                value: 42,
                writable: true
        };

        t.test('works with Object.prototype poisoned setter', { skip: !Object.defineProperty }, function (st) {
                var key = 'foo';

                var obj = {};
                obj[key] = 42;

                var expected = {};
                expected[key] = {
                        configurable: true,
                        enumerable: true,
                        value: 42,
                        writable: true
                };

                st.teardown(mockProperty(Object.prototype, key, { set: function (v) { throw new Error(v); } }));

                var hasOwnNamesBug = false;
                try {
                        Object.getOwnPropertyNames(obj);
                } catch (e) {
                        // v8 in node 0.6 - 0.12 has a bug :-(
                        hasOwnNamesBug = true;
                        st.comment('SKIP: this engine has a bug with Object.getOwnPropertyNames: it can not handle a throwing setter on Object.prototype.');
                }

                if (!hasOwnNamesBug) {
                        st.doesNotThrow(function () {
                                var result = getDescriptors(obj);
                                st.deepEqual(result, expected, 'got expected descriptors');
                        });
                }

                delete Object.prototype[key];
                st.end();
        });

        t.test('gets all expected non-Symbol descriptors', function (st) {
                var obj = { normal: Infinity };
                Object.defineProperty(obj, 'enumerable', enumDescriptor);
                Object.defineProperty(obj, 'writable', writableDescriptor);

                var descriptors = getDescriptors(obj);

                st.deepEqual(descriptors, {
                        enumerable: enumDescriptor,
                        normal: {
                                configurable: true,
                                enumerable: true,
                                value: Infinity,
                                writable: true
                        },
                        writable: writableDescriptor
                });
                st.end();
        });

        var supportsSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
        t.test('gets Symbol descriptors too', { skip: !supportsSymbols }, function (st) {
                var symbol = Symbol('sym');
                var symDescriptor = {
                        configurable: false,
                        enumerable: true,
                        value: [symbol],
                        writable: true
                };
                var obj = { normal: Infinity };
                Object.defineProperty(obj, 'enumerable', enumDescriptor);
                Object.defineProperty(obj, 'writable', writableDescriptor);
                Object.defineProperty(obj, 'symbol', symDescriptor);

                var descriptors = getDescriptors(obj);

                st.deepEqual(descriptors, {
                        enumerable: enumDescriptor,
                        normal: {
                                configurable: true,
                                enumerable: true,
                                value: Infinity,
                                writable: true
                        },
                        symbol: symDescriptor,
                        writable: writableDescriptor
                });
                st.end();
        });

        var supportsProxy = typeof Proxy === 'function';
        t.test('Proxies that return an undefined descriptor', { skip: !supportsProxy }, function (st) {
                var obj = { foo: true };
                var fooDescriptor = Object.getOwnPropertyDescriptor(obj, 'foo');

                var proxy = new Proxy(obj, {
                        getOwnPropertyDescriptor: function (target, key) {
                                return Object.getOwnPropertyDescriptor(target, key);
                        },
                        ownKeys: function () {
                                return ['foo', 'bar'];
                        }
                });
                st.deepEqual(getDescriptors(proxy), { foo: fooDescriptor }, 'object has no descriptors');
                st.end();
        });
};