abstract-state-router/test/promise-map-series.js

The basics of a client-side state router ala the AngularJS ui-router, but without any DOM interactions

// Copied from https://github.com/joliss/promise-map-series/blob/master/test.js

var test = require('tape-catch')
var Promise = require('native-promise-only/npo')
var mapSeries = require('../lib/promise-map-series')

test('mapSeries', function (t) {
	t.test('iterator is called in sequence for each item', function (t) {
		t.plan(6)
		var seq = 0
		mapSeries([0, 1], function (item) {
				t.equal(seq, item)
				return new Promise(function (resolve, reject) {
					setTimeout(function () {
						t.equal(seq++, item)
						resolve(item === 0 ? 'foo' : 'bar')
					}, 10)
				})
			})
			.then(function (results) {
				t.equal(seq, 2)
				t.deepEqual(results, ['foo', 'bar'])
			})
	})

	t.test('is rejected on first rejection', function (t) {
		t.plan(2)
		var errorObject = new Error('rejected')
		mapSeries([0, 1], function (item) {
				t.pass('is called once')
				throw errorObject
			})
			.then(function () {
				t.fail('promise should be rejected')
			}, function (err) {
				t.equal(err, errorObject)
			})
	})

	t.test('passes index and array argument to iterator', function (t) {
		t.plan(5)
		var arr = [42, 43]
		mapSeries(arr, function (item, index, array) {
			t.equal(item, index + 42)
			t.equal(array, arr)
		}).then(function (results) {
			t.deepEqual(results, [undefined, undefined])
		})
	})

	t.test('accepts optional thisArg argument', function (t) {
		t.plan(2)
		var obj = {}
		mapSeries([0], function (item) {
			t.equal(this, global)
		})
		mapSeries([0], function (item) {
			t.equal(this, obj)
		}, obj)
	})
})