polyfill-service/polyfills/Array/prototype/@@iterator/tests.js

A polyfill combinator

/* eslint-env mocha, browser */
/* global proclaim */

it('is named \'values\' or \'ArrayValues\'', function () {
	// Don't fail tests just because browser doesn't support the Function.name polyfill
	if ([][Symbol.iterator].name) {
		try {
			proclaim.equal([][Symbol.iterator].name, 'values');
		} catch (e) {
			// Chrome 40 implements the Symbol.iterator function for Arrays but has it named ArrayValues.
			proclaim.equal([][Symbol.iterator].name, 'ArrayValues');
		}
	}
});

it('returns a next-able object', function () {
	var array = ['val1', 'val2'];
	var iterator = array[Symbol.iterator]();

	proclaim.isInstanceOf(iterator.next, Function);
	proclaim.deepEqual(iterator.next(), {
		value: 'val1',
		done: false
	});
});

it('finally returns a done object', function () {
	var array = ['val1', 'val2'];
	var iterator = array[Symbol.iterator]();
	iterator.next();
	iterator.next();
	proclaim.deepEqual(iterator.next(), {
		value: undefined,
		done: true
	});
});