spec-js/observables/interval-spec.js

"use strict";
var chai_1 = require('chai');
var sinon = require('sinon');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
var asap = Rx.Scheduler.asap;
var queue = Rx.Scheduler.queue;
var animationFrame = Rx.Scheduler.animationFrame;
/** @test {interval} */
describe('Observable.interval', function () {
    asDiagram('interval(1000)')('should create an observable emitting periodically', function () {
        var e1 = Observable.interval(20, rxTestScheduler)
            .take(6) // make it actually finite, so it can be rendered
            .concat(Observable.never()); // but pretend it's infinite by not completing
        var expected = '--a-b-c-d-e-f-';
        var values = {
            a: 0,
            b: 1,
            c: 2,
            d: 3,
            e: 4,
            f: 5,
        };
        expectObservable(e1).toBe(expected, values);
    });
    it('should set up an interval', function () {
        var expected = '----------0---------1---------2---------3---------4---------5---------6-----';
        expectObservable(Observable.interval(100, rxTestScheduler)).toBe(expected, [0, 1, 2, 3, 4, 5, 6]);
    });
    it('should specify default scheduler if incorrect scheduler specified', function () {
        var scheduler = Observable.interval(10, sinon.stub()).scheduler;
        chai_1.expect(scheduler).to.equal(Rx.Scheduler.async);
    });
    it('should emit when relative interval set to zero', function () {
        var e1 = Observable.interval(0, rxTestScheduler).take(7);
        var expected = '(0123456|)';
        expectObservable(e1).toBe(expected, [0, 1, 2, 3, 4, 5, 6]);
    });
    it('should consider negative interval as zero', function () {
        var e1 = Observable.interval(-1, rxTestScheduler).take(7);
        var expected = '(0123456|)';
        expectObservable(e1).toBe(expected, [0, 1, 2, 3, 4, 5, 6]);
    });
    it('should emit values until unsubscribed', function (done) {
        var values = [];
        var expected = [0, 1, 2, 3, 4, 5, 6];
        var e1 = Observable.interval(5);
        var subscription = e1.subscribe(function (x) {
            values.push(x);
            if (x === 6) {
                subscription.unsubscribe();
                chai_1.expect(values).to.deep.equal(expected);
                done();
            }
        }, function (err) {
            done(new Error('should not be called'));
        }, function () {
            done(new Error('should not be called'));
        });
    });
    it('should create an observable emitting periodically with the AsapScheduler', function (done) {
        var sandbox = sinon.sandbox.create();
        var fakeTimer = sandbox.useFakeTimers();
        var interval = 10;
        var events = [0, 1, 2, 3, 4, 5];
        var source = Observable.interval(interval, asap).take(6);
        source.subscribe({
            next: function (x) {
                chai_1.expect(x).to.equal(events.shift());
            },
            error: function (e) {
                sandbox.restore();
                done(e);
            },
            complete: function () {
                chai_1.expect(asap.actions.length).to.equal(0);
                chai_1.expect(asap.scheduled).to.equal(undefined);
                sandbox.restore();
                done();
            }
        });
        var i = -1, n = events.length;
        while (++i < n) {
            fakeTimer.tick(interval);
        }
    });
    it('should create an observable emitting periodically with the QueueScheduler', function (done) {
        var sandbox = sinon.sandbox.create();
        var fakeTimer = sandbox.useFakeTimers();
        var interval = 10;
        var events = [0, 1, 2, 3, 4, 5];
        var source = Observable.interval(interval, queue).take(6);
        source.subscribe({
            next: function (x) {
                chai_1.expect(x).to.equal(events.shift());
            },
            error: function (e) {
                sandbox.restore();
                done(e);
            },
            complete: function () {
                chai_1.expect(queue.actions.length).to.equal(0);
                chai_1.expect(queue.scheduled).to.equal(undefined);
                sandbox.restore();
                done();
            }
        });
        var i = -1, n = events.length;
        while (++i < n) {
            fakeTimer.tick(interval);
        }
    });
    it('should create an observable emitting periodically with the AnimationFrameScheduler', function (done) {
        var sandbox = sinon.sandbox.create();
        var fakeTimer = sandbox.useFakeTimers();
        var interval = 10;
        var events = [0, 1, 2, 3, 4, 5];
        var source = Observable.interval(interval, animationFrame).take(6);
        source.subscribe({
            next: function (x) {
                chai_1.expect(x).to.equal(events.shift());
            },
            error: function (e) {
                sandbox.restore();
                done(e);
            },
            complete: function () {
                chai_1.expect(animationFrame.actions.length).to.equal(0);
                chai_1.expect(animationFrame.scheduled).to.equal(undefined);
                sandbox.restore();
                done();
            }
        });
        var i = -1, n = events.length;
        while (++i < n) {
            fakeTimer.tick(interval);
        }
    });
});
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