@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
103 lines • 4.96 kB
JavaScript
;
var Rx = require('../../dist/cjs/Rx');
var chai_1 = require('chai');
var Observable = Rx.Observable;
/** @test {observeOn} */
describe('Observable.prototype.observeOn', function () {
asDiagram('observeOn(scheduler)')('should observe on specified scheduler', function () {
var e1 = hot('--a--b--|');
var expected = '--a--b--|';
var sub = '^ !';
expectObservable(e1.observeOn(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should observe after specified delay', function () {
var e1 = hot('--a--b--|');
var expected = '-----a--b--|';
var sub = '^ !';
expectObservable(e1.observeOn(rxTestScheduler, 30)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should observe when source raises error', function () {
var e1 = hot('--a--#');
var expected = '--a--#';
var sub = '^ !';
expectObservable(e1.observeOn(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should observe when source is empty', function () {
var e1 = hot('-----|');
var expected = '-----|';
var sub = '^ !';
expectObservable(e1.observeOn(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should observe when source does not complete', function () {
var e1 = hot('-----');
var expected = '-----';
var sub = '^ ';
expectObservable(e1.observeOn(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should allow unsubscribing early and explicitly', function () {
var e1 = hot('--a--b--|');
var sub = '^ ! ';
var expected = '--a-- ';
var unsub = ' ! ';
var result = e1.observeOn(rxTestScheduler);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should not break unsubscription chains when the result is unsubscribed explicitly', function () {
var e1 = hot('--a--b--|');
var sub = '^ ! ';
var expected = '--a-- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.observeOn(rxTestScheduler)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should clean up subscriptions created by async scheduling (prevent memory leaks #2244)', function (done) {
//HACK: Deep introspection to make sure we're cleaning up notifications in scheduling.
// as the architecture changes, this test may become brittle.
var results = [];
// This is to build a scheduled observable with a slightly more stable
// subscription structure, since we're going to hack in to analyze it in this test.
var subscription = new Observable(function (observer) {
var i = 1;
return Rx.Scheduler.asap.schedule(function () {
if (i > 3) {
observer.complete();
}
else {
observer.next(i++);
this.schedule();
}
});
})
.observeOn(Rx.Scheduler.asap)
.subscribe(function (x) {
var observeOnSubscriber = subscription._subscriptions[0]._innerSub;
chai_1.expect(observeOnSubscriber._subscriptions.length).to.equal(2); // 1 for the consumer, and one for the notification
chai_1.expect(observeOnSubscriber._subscriptions[1]._innerSub.state.notification.kind)
.to.equal('N');
chai_1.expect(observeOnSubscriber._subscriptions[1]._innerSub.state.notification.value)
.to.equal(x);
results.push(x);
}, function (err) { return done(err); }, function () {
// now that the last nexted value is done, there should only be a complete notification scheduled
var observeOnSubscriber = subscription._subscriptions[0]._innerSub;
chai_1.expect(observeOnSubscriber._subscriptions.length).to.equal(2); // 1 for the consumer, one for the complete notification
// only this completion notification should remain.
chai_1.expect(observeOnSubscriber._subscriptions[1]._innerSub.state.notification.kind)
.to.equal('C');
// After completion, the entire _subscriptions list is nulled out anyhow, so we can't test much further than this.
chai_1.expect(results).to.deep.equal([1, 2, 3]);
done();
});
});
});
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