295 lines
7.2 KiB
Plaintext
295 lines
7.2 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 hasPropertyDescriptors = require('has-property-descriptors')();
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var iterate = require('iterate-iterator');
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var index = require('../Iterator.prototype.drop');
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var impl = require('../Iterator.prototype.drop/implementation');
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var fnName = 'drop';
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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 (drop, name, t) {
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t['throws'](
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function () { return new drop(); }, // 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 () { iterate(drop(nonIterator, 0)); },
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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 () { iterate(drop(badNext, 0)); },
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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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t.test('observable lookups', { skip: !hasPropertyDescriptors }, function (st) {
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var effects = [];
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var obj = {};
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Object.defineProperty(obj, 'next', {
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configurable: true,
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enumerable: true,
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get: function next() {
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effects.push('get next');
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return function () {
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return { done: true, value: undefined };
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};
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}
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});
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drop(obj, {
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valueOf: function valueOf() {
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effects.push('ToNumber limit');
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return 0;
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}
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});
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st.deepEqual(effects, [
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'ToNumber limit',
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'get next'
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]);
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st.end();
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});
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var arr = [1, 2, 3];
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t.test('actual iteration', { skip: !hasSymbols }, function (st) {
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var iterator = callBind(arr[Symbol.iterator], arr);
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st['throws'](
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function () { drop(iterator(), -3); },
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RangeError,
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'-3 is not >= 0'
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);
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st['throws'](
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function () { return new drop(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 drop(iterator(), 0); }, // 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(drop(iterator(), 0), [1, 2, 3], st, 'drop 0');
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testIterator(drop(iterator(), 1), [2, 3], st, 'drop 1');
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testIterator(drop(iterator(), 2), [3], st, 'drop 2');
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testIterator(drop(iterator(), 3), [], st, 'drop 3');
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testIterator(drop(iterator(), Infinity), [], st, 'drop ∞');
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st.end();
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});
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t.test('262: test/built-ins/Iterator/prototype/drop/get-return-method-throws', { skip: !hasPropertyDescriptors }, function (st) {
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var badIterator = {
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next: function next() {
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return {
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done: false,
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value: 1
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};
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}
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};
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Object.defineProperty(badIterator, 'return', {
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configurable: true,
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enumerable: true,
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get: function () { throw new SyntaxError(); }
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});
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var iter = drop(badIterator, 1);
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iter.next();
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st['throws'](
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function () { iter['return'](); },
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SyntaxError,
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'gets the `return` method, whose getter throws'
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);
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st.end();
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});
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t.test('262: test/built-ins/Iterator/prototype/drop/return-is-forwarded', function (st) {
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var returnCount = 0;
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var makeBadIterator = function makeBadIterator() {
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return {
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next: function next() {
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return {
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done: false,
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value: 1
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};
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},
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'return': function () {
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returnCount += 1;
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return {};
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}
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};
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};
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var iter1 = drop(makeBadIterator(), 0);
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st.equal(returnCount, 0, 'iter1, before return()');
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iter1['return']();
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st.equal(returnCount, 1, 'iter1, after return()');
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var iter2 = drop(makeBadIterator(), 1);
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st.equal(returnCount, 1, 'iter2, before return()');
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iter2['return']();
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st.equal(returnCount, 2, 'iter2, after return()');
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// 5 drops (i wish i had pipeline)
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var iter3 = drop(
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drop(
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drop(
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drop(
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drop(
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makeBadIterator(),
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1
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),
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1
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),
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1
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),
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1
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),
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1
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);
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st.equal(returnCount, 2, 'iter3, before return()');
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iter3['return']();
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st.equal(returnCount, 3, 'iter3, after return()');
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st.end();
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});
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t.test('262: test/built-ins/Iterator/prototype/drop/return-is-not-forwarded-after-exhaustion', { skip: !hasPropertyDescriptors }, function (st) {
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var makeBadIterator = function makeBadIterator() {
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return {
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next: function next() {
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return {
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done: true,
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value: undefined
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};
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},
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'return': function () {
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throw new SyntaxError();
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}
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};
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};
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var iter1 = drop(makeBadIterator(), 0);
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st['throws'](
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function () { iter1['return'](); },
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SyntaxError,
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'iter1, return() throws'
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);
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iter1.next();
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iter1['return']();
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var iter2 = drop(makeBadIterator(), 1);
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st['throws'](
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function () { iter2['return'](); },
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SyntaxError,
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'iter2, return() throws'
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);
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iter2.next();
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iter2['return']();
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// 5 drops (i wish i had pipeline)
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var iter3 = drop(
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drop(
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drop(
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drop(
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drop(
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makeBadIterator(),
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1
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),
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1
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),
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1
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),
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1
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),
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1
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);
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st['throws'](
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function () { iter3['return'](); },
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SyntaxError,
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'iter3, return() throws'
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);
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iter3.next();
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iter3['return']();
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var iter4 = drop(makeBadIterator(), 10);
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st['throws'](
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function () { iter4['return'](); },
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SyntaxError,
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'iter4, return() throws'
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);
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iter4.next();
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iter4['return']();
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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.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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