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'use strict'
const { test } = require('tap')
const { Headers, FormData } = require('../..')
test('Implements " Iterator" properly', (t) => {
t.test('all Headers iterators implement Headers Iterator', (t) => {
const headers = new Headers([['a', 'b'], ['c', 'd']])
for (const iterable of ['keys', 'values', 'entries', Symbol.iterator]) {
const gen = headers[iterable]()
// https://tc39.es/ecma262/#sec-%25iteratorprototype%25-object
const IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
const iteratorProto = Object.getPrototypeOf(gen)
t.ok(gen.constructor === Object)
t.ok(gen.prototype === undefined)
// eslint-disable-next-line no-proto
t.equal(gen.__proto__[Symbol.toStringTag], 'Headers Iterator')
// https://github.com/node-fetch/node-fetch/issues/1119#issuecomment-100222049
t.notOk(Headers.prototype[iterable] instanceof function * () {}.constructor)
// eslint-disable-next-line no-proto
t.ok(gen.__proto__.next.__proto__ === Function.prototype)
// https://webidl.spec.whatwg.org/#dfn-iterator-prototype-object
// "The [[Prototype]] internal slot of an iterator prototype object must be %IteratorPrototype%."
t.equal(gen[Symbol.iterator], IteratorPrototype[Symbol.iterator])
t.equal(Object.getPrototypeOf(iteratorProto), IteratorPrototype)
}
t.end()
})
t.test('all FormData iterators implement FormData Iterator', (t) => {
const fd = new FormData()
for (const iterable of ['keys', 'values', 'entries', Symbol.iterator]) {
const gen = fd[iterable]()
// https://tc39.es/ecma262/#sec-%25iteratorprototype%25-object
const IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
const iteratorProto = Object.getPrototypeOf(gen)
t.ok(gen.constructor === Object)
t.ok(gen.prototype === undefined)
// eslint-disable-next-line no-proto
t.equal(gen.__proto__[Symbol.toStringTag], 'FormData Iterator')
// https://github.com/node-fetch/node-fetch/issues/1119#issuecomment-100222049
t.notOk(Headers.prototype[iterable] instanceof function * () {}.constructor)
// eslint-disable-next-line no-proto
t.ok(gen.__proto__.next.__proto__ === Function.prototype)
// https://webidl.spec.whatwg.org/#dfn-iterator-prototype-object
// "The [[Prototype]] internal slot of an iterator prototype object must be %IteratorPrototype%."
t.equal(gen[Symbol.iterator], IteratorPrototype[Symbol.iterator])
t.equal(Object.getPrototypeOf(iteratorProto), IteratorPrototype)
}
t.end()
})
t.test('Iterator symbols are properly set', (t) => {
t.test('Headers', (t) => {
const headers = new Headers([['a', 'b'], ['c', 'd']])
const gen = headers.entries()
t.equal(typeof gen[Symbol.toStringTag], 'string')
t.equal(typeof gen[Symbol.iterator], 'function')
t.end()
})
t.test('FormData', (t) => {
const fd = new FormData()
const gen = fd.entries()
t.equal(typeof gen[Symbol.toStringTag], 'string')
t.equal(typeof gen[Symbol.iterator], 'function')
t.end()
})
t.end()
})
t.test('Iterator does not inherit Generator prototype methods', (t) => {
t.test('Headers', (t) => {
const headers = new Headers([['a', 'b'], ['c', 'd']])
const gen = headers.entries()
t.equal(gen.return, undefined)
t.equal(gen.throw, undefined)
t.equal(typeof gen.next, 'function')
t.end()
})
t.test('FormData', (t) => {
const fd = new FormData()
const gen = fd.entries()
t.equal(gen.return, undefined)
t.equal(gen.throw, undefined)
t.equal(typeof gen.next, 'function')
t.end()
})
t.end()
})
t.test('Symbol.iterator', (t) => {
// Headers
const headerValues = new Headers([['a', 'b']]).entries()[Symbol.iterator]()
t.same(Array.from(headerValues), [['a', 'b']])
// FormData
const formdata = new FormData()
formdata.set('a', 'b')
const formdataValues = formdata.entries()[Symbol.iterator]()
t.same(Array.from(formdataValues), [['a', 'b']])
t.end()
})
t.test('brand check', (t) => {
// Headers
t.throws(() => {
const gen = new Headers().entries()
// eslint-disable-next-line no-proto
gen.__proto__.next()
}, TypeError)
// FormData
t.throws(() => {
const gen = new FormData().entries()
// eslint-disable-next-line no-proto
gen.__proto__.next()
}, TypeError)
t.end()
})
t.end()
})
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