source: imaps-frontend/node_modules/es-iterator-helpers/test/Iterator.concat.js

'use strict';

var defineProperties = require('define-properties');
var test = require('tape');
var callBind = require('call-bind');
var functionsHaveNames = require('functions-have-names')();
var forEach = require('for-each');
var debug = require('object-inspect');
var v = require('es-value-fixtures');
var hasSymbols = require('has-symbols/shams')();
var mockProperty = require('mock-property');

var index = require('../Iterator.concat');
var impl = require('../Iterator.concat/implementation');
var from = require('../Iterator.from/polyfill')();

var isEnumerable = Object.prototype.propertyIsEnumerable;

var testIterator = require('./helpers/testIterator');

module.exports = {
        tests: function (concat, name, t) {
                t['throws'](
                        function () { return new concat(); }, // eslint-disable-line new-cap
                        TypeError,
                        '`' + name + '` itself is not a constructor'
                );
                t['throws'](
                        function () { return new concat({}); }, // eslint-disable-line new-cap
                        TypeError,
                        '`' + name + '` itself is not a constructor, with an argument'
                );

                forEach(v.primitives.concat(v.objects), function (nonIterator) {
                        t['throws'](
                                function () { concat(nonIterator); },
                                TypeError,
                                debug(nonIterator) + ' is not an iterable Object'
                        );
                });

                t.test('actual iteration', { skip: !hasSymbols }, function (st) {
                        forEach(v.nonFunctions, function (nonFunction) {
                                var badIterable = {};
                                badIterable[Symbol.iterator] = nonFunction;
                                st['throws'](
                                        function () { concat([], badIterable, []).next(); },
                                        TypeError,
                                        debug(badIterable) + ' is not a function'
                                );
                        });

                        forEach(v.strings, function (string) {
                                st['throws'](
                                        function () { concat(string); },
                                        TypeError,
                                        'non-objects are not considered iterable'
                                );
                                var stringIt = concat(['a'], [string], ['c']);
                                testIterator(stringIt, ['a', string, 'c'], st, 'string iterator: ' + debug(string));
                        });

                        var arrayIt = concat([1, 2, 3]);
                        st.equal(typeof arrayIt.next, 'function', 'has a `next` function');

                        st.test('real iterators', { skip: !hasSymbols }, function (s2t) {
                                var iter = [1, 2][Symbol.iterator]();
                                testIterator(concat(iter, [3]), [1, 2, 3], s2t, 'array iterator + array yields combined results');

                                s2t.end();
                        });

                        st.test('observability in a replaced String iterator', function (s2t) {
                                var originalStringIterator = String.prototype[Symbol.iterator];
                                var observedType;
                                s2t.teardown(mockProperty(String.prototype, Symbol.iterator, {
                                        get: function () {
                                                'use strict'; // eslint-disable-line strict, lines-around-directive

                                                observedType = typeof this;
                                                return originalStringIterator;
                                        }
                                }));

                                concat(from(''));
                                s2t.equal(observedType, 'string', 'string primitive -> primitive receiver in Symbol.iterator getter');
                                concat(from(Object('')));
                                s2t.equal(observedType, 'object', 'boxed string -> boxed string in Symbol.iterator getter');

                                s2t.end();
                        });

                        st.end();
                });
        },
        index: function () {
                test('Iterator.concat: index', function (t) {
                        module.exports.tests(index, 'Iterator.concat', t);

                        t.end();
                });
        },
        implementation: function () {
                test('Iterator.concat: implementation', function (t) {
                        module.exports.tests(impl, 'Iterator.concat', t);

                        t.end();
                });
        },
        shimmed: function () {
                test('Iterator.concat: shimmed', function (t) {
                        t.test('Function name', { skip: !functionsHaveNames }, function (st) {
                                st.equal(Iterator.concat.name, 'concat', 'Iterator.concat has name "concat"');
                                st.end();
                        });

                        t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
                                et.equal(false, isEnumerable.call(Iterator, 'concat'), 'Iterator.concat is not enumerable');
                                et.end();
                        });

                        module.exports.tests(callBind(Iterator.concat, Iterator), 'Iterator.concat', t);

                        t.end();
                });
        }
};