spec-js/observables/concat-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var test_helper_1 = require('../helpers/test-helper');
var Observable = Rx.Observable;
var queueScheduler = Rx.Scheduler.queue;
/** @test {concat} */
describe('Observable.concat', function () {
it('should emit elements from multiple sources', function () {
var e1 = cold('-a-b-c-|');
var e1subs = '^ !';
var e2 = cold('-0-1-|');
var e2subs = ' ^ !';
var e3 = cold('-w-x-y-z-|');
var e3subs = ' ^ !';
var expected = '-a-b-c--0-1--w-x-y-z-|';
expectObservable(Observable.concat(e1, e2, e3)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should concat the same cold observable multiple times', function () {
var inner = cold('--i-j-k-l-| ');
var innersubs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ !'];
var expected = '--i-j-k-l---i-j-k-l---i-j-k-l---i-j-k-l-|';
var result = Observable.concat(inner, inner, inner, inner);
expectObservable(result).toBe(expected);
expectSubscriptions(inner.subscriptions).toBe(innersubs);
});
it('should concat the same cold observable multiple times, ' +
'but the result is unsubscribed early', function () {
var inner = cold('--i-j-k-l-| ');
var unsub = ' !';
var innersubs = ['^ ! ',
' ^ !'];
var expected = '--i-j-k-l---i-j-';
var result = Observable.concat(inner, inner, inner, inner);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(inner.subscriptions).toBe(innersubs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var inner = cold('--i-j-k-l-| ');
var innersubs = ['^ ! ',
' ^ !'];
var expected = '--i-j-k-l---i-j-';
var unsub = ' !';
var innerWrapped = inner.mergeMap(function (x) { return Observable.of(x); });
var result = Observable
.concat(innerWrapped, innerWrapped, innerWrapped, innerWrapped)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(inner.subscriptions).toBe(innersubs);
});
it('should complete without emit if both sources are empty', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('----|');
var e2subs = ' ^ !';
var expected = '------|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if first source does not completes', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('--|');
var e2subs = [];
var expected = '-';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if second source does not completes', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('---');
var e2subs = ' ^';
var expected = '---';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if both sources do not complete', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('-');
var e2subs = [];
var expected = '-';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error when first source is empty, second source raises error', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('----#');
var e2subs = ' ^ !';
var expected = '------#';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error when first source raises error, second source is empty', function () {
var e1 = cold('---#');
var e1subs = '^ !';
var e2 = cold('----|');
var e2subs = [];
var expected = '---#';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise first error when both source raise error', function () {
var e1 = cold('---#');
var e1subs = '^ !';
var e2 = cold('------#');
var e2subs = [];
var expected = '---#';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should concat if first source emits once, second source is empty', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold('--------|');
var e2subs = ' ^ !';
var expected = '--a----------|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should concat if first source is empty, second source emits once', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('--a--|');
var e2subs = ' ^ !';
var expected = '----a--|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit element from first source, and should not complete if second ' +
'source does not completes', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold('-');
var e2subs = ' ^';
var expected = '--a---';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if first source does not complete', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('--a--|');
var e2subs = [];
var expected = '-';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit elements from each source when source emit once', function () {
var e1 = cold('---a|');
var e1subs = '^ !';
var e2 = cold('-----b--|');
var e2subs = ' ^ !';
var expected = '---a-----b--|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should unsubscribe to inner source if outer is unsubscribed early', function () {
var e1 = cold('---a-a--a| ');
var e1subs = '^ ! ';
var e2 = cold('-----b-b--b-|');
var e2subs = ' ^ ! ';
var unsub = ' ! ';
var expected = '---a-a--a-----b-b ';
expectObservable(Observable.concat(e1, e2), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error from first source and does not emit from second source', function () {
var e1 = cold('--#');
var e1subs = '^ !';
var e2 = cold('----a--|');
var e2subs = [];
var expected = '--#';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit element from first source then raise error from second source', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold('-------#');
var e2subs = ' ^ !';
var expected = '--a---------#';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit all elements from both hot observable sources if first source ' +
'completes before second source starts emit', function () {
var e1 = hot('--a--b-|');
var e1subs = '^ !';
var e2 = hot('--------x--y--|');
var e2subs = ' ^ !';
var expected = '--a--b--x--y--|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit elements from second source regardless of completion time ' +
'when second source is cold observable', function () {
var e1 = hot('--a--b--c---|');
var e1subs = '^ !';
var e2 = cold('-x-y-z-|');
var e2subs = ' ^ !';
var expected = '--a--b--c----x-y-z-|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not emit collapsing element from second source', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var e2 = hot('--------x--y--z--|');
var e2subs = ' ^ !';
var expected = '--a--b--c--y--z--|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should return empty if concatenating an empty source', function () {
var e1 = cold('|');
var e1subs = ['(^!)', '(^!)'];
var expected = '|';
var result = Observable.concat(e1, e1);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should error immediately if given a just-throw source', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
var result = Observable.concat(e1, e1);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit elements from second source regardless of completion time ' +
'when second source is cold observable', function () {
var e1 = hot('--a--b--c---|');
var e1subs = '^ !';
var e2 = cold('-x-y-z-|');
var e2subs = ' ^ !';
var expected = '--a--b--c----x-y-z-|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not emit collapsing element from second source', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var e2 = hot('--------x--y--z--|');
var e2subs = ' ^ !';
var expected = '--a--b--c--y--z--|';
expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should concat an immediately-scheduled source with an immediately-scheduled second', function (done) {
var a = Observable.of(1, 2, 3, queueScheduler);
var b = Observable.of(4, 5, 6, 7, 8, queueScheduler);
var r = [1, 2, 3, 4, 5, 6, 7, 8];
Observable.concat(a, b, queueScheduler).subscribe(function (vals) {
chai_1.expect(vals).to.equal(r.shift());
}, null, done);
});
it('should use the scheduler even when one Observable is concat\'d', function (done) {
var e1Subscribed = false;
var e1 = Observable.defer(function () {
e1Subscribed = true;
return Observable.of('a');
});
Observable
.concat(e1, Rx.Scheduler.async)
.subscribe({
error: done,
complete: function () {
chai_1.expect(e1Subscribed).to.be.true;
done();
}
});
chai_1.expect(e1Subscribed).to.be.false;
});
it('should return passed observable if no scheduler was passed', function () {
var source = cold('--a---b----c---|');
var result = Observable.concat(source);
chai_1.expect(result).to.equal(source);
expectObservable(result).toBe('--a---b----c---|');
});
it('should return RxJS Observable when single lowerCaseO was passed', function () {
var source = test_helper_1.lowerCaseO('a', 'b', 'c');
var result = Observable.concat(source);
chai_1.expect(result).to.be.an.instanceof(Observable);
expectObservable(result).toBe('(abc|)');
});
});
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