160 lines
4.7 KiB
Plaintext
160 lines
4.7 KiB
Plaintext
'use strict';
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var defineProperties = require('define-properties');
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var test = require('tape');
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var callBind = require('call-bind');
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var functionsHaveNames = require('functions-have-names')();
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var hasStrictMode = require('has-strict-mode')();
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var forEach = require('for-each');
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var debug = require('object-inspect');
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var v = require('es-value-fixtures');
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var hasSymbols = require('has-symbols/shams')();
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var generators = require('make-generator-function')();
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var index = require('../Iterator.prototype.map');
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var impl = require('../Iterator.prototype.map/implementation');
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var fnName = 'map';
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var isEnumerable = Object.prototype.propertyIsEnumerable;
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var testIterator = require('./helpers/testIterator');
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module.exports = {
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tests: function (map, name, t) {
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t['throws'](
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function () { return new map(); }, // eslint-disable-line new-cap
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TypeError,
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'`' + name + '` itself is not a constructor'
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);
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forEach(v.primitives.concat(v.objects), function (nonIterator) {
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t['throws'](
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function () { map(nonIterator); },
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TypeError,
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debug(nonIterator) + ' is not an Object with a callable `next` method'
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);
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var badNext = { next: nonIterator };
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t['throws'](
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function () { map(badNext); },
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TypeError,
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debug(badNext) + ' is not an Object with a callable `next` method'
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);
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});
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forEach(v.nonFunctions, function (nonFunction) {
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t['throws'](
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function () { map({ next: function () {} }, nonFunction); },
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TypeError,
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debug(nonFunction) + ' is not a function'
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);
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});
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var sentinel = {};
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var done = false;
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var fakeIterator = {
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next: function () {
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try {
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return {
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done: !!done,
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value: sentinel
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};
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} finally {
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done = done === false ? null : true;
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}
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}
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};
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var result = {};
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testIterator(
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map(fakeIterator, function (x, i) {
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result.value = x;
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result.counter = i;
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result.receiver = this; // eslint-disable-line no-invalid-this
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result.args = arguments.length;
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return fakeIterator;
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}),
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[fakeIterator, fakeIterator],
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t,
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'fake iterator, mapped, runs as expected'
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);
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t.deepEqual(
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result,
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{ value: sentinel, counter: 1, receiver: undefined, args: 2 },
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'callback is called with the correct arguments'
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);
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t.test('actual iteration', { skip: !hasSymbols }, function (st) {
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var arr = [1, 2, 3];
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var iterator = callBind(arr[Symbol.iterator], arr);
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st['throws'](
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function () { return new map(iterator()); }, // eslint-disable-line new-cap
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TypeError,
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'`' + name + '` iterator is not a constructor'
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);
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st['throws'](
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function () { return new map(iterator(), function () {}); }, // eslint-disable-line new-cap
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TypeError,
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'`' + name + '` iterator is not a constructor'
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);
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testIterator(iterator(), [1, 2, 3], st, 'original');
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testIterator(map(iterator(), function (x) { return x; }), [1, 2, 3], st, 'identity mapper');
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testIterator(map(iterator(), function (x) { return 2 * x; }), [2, 4, 6], st, 'doubler mapper');
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st.test('generators', { skip: generators.length === 0 }, function (s2t) {
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forEach(generators, function (gen) {
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s2t.doesNotThrow(
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function () { map(gen(), function () {}); },
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'generator function ' + debug(gen) + ' does not need to be from-wrapped first'
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);
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});
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s2t.end();
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});
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st.end();
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});
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},
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index: function () {
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test('Iterator.prototype.' + fnName + ': index', function (t) {
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module.exports.tests(index, 'Iterator.prototype.' + fnName, t);
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t.end();
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});
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},
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implementation: function () {
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test('Iterator.prototype.' + fnName + ': implementation', function (t) {
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module.exports.tests(callBind(impl), 'Iterator.prototype.' + fnName, t);
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t.end();
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});
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},
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shimmed: function () {
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test('Iterator.prototype.' + fnName + ': shimmed', function (t) {
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t.equal(typeof Iterator.prototype[fnName], 'function', 'exists and is a function');
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t.test('Function name', { skip: !functionsHaveNames }, function (st) {
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st.equal(Iterator.prototype[fnName].name, fnName, 'Iterator#' + fnName + ' has name "' + fnName + '"');
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st.end();
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});
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t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
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et.equal(false, isEnumerable.call(Iterator.prototype, fnName), 'Iterator#' + fnName + ' is not enumerable');
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et.end();
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});
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t.test('bad string/this value', { skip: !hasStrictMode }, function (st) {
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st['throws'](function () { return Iterator.prototype[fnName].call(undefined, 'a'); }, TypeError, 'undefined is not an object');
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st['throws'](function () { return Iterator.prototype[fnName].call(null, 'a'); }, TypeError, 'null is not an object');
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st.end();
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});
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module.exports.tests(callBind(Iterator.prototype[fnName]), 'Iterator.prototype.' + fnName, t);
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t.end();
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});
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}
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};
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