@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
140 lines • 5.42 kB
JavaScript
;
var chai_1 = require('chai');
var sinon = require('sinon');
var Rx = require('../../dist/cjs/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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