spec-js/operators/concat-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {concat} */
describe('Observable.prototype.concat', function () {
asDiagram('concat')('should concatenate two cold observables', function () {
var e1 = cold('--a--b-|');
var e2 = cold('--x---y--|');
var expected = '--a--b---x---y--|';
expectObservable(e1.concat(e2, rxTestScheduler)).toBe(expected);
});
it('should work properly with scalar observables', function (done) {
var results = [];
var s1 = Observable
.create(function (observer) {
setTimeout(function () {
observer.next(1);
observer.complete();
});
})
.concat(Observable.of(2));
s1.subscribe(function (x) {
results.push('Next: ' + x);
}, function (x) {
done(new Error('should not be called'));
}, function () {
results.push('Completed');
chai_1.expect(results).to.deep.equal(['Next: 1', 'Next: 2', 'Completed']);
done();
});
});
it('should complete without emit if both sources are empty', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('----|');
var e2subs = ' ^ !';
var expected = '------|';
expectObservable(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(e2), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = cold('---a-a--a| ');
var e1subs = '^ ! ';
var e2 = cold('-----b-b--b-|');
var e2subs = ' ^ ! ';
var expected = '---a-a--a-----b-b- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.concat(e2)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, 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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(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(e1.concat(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should accept scheduler with multiple observables', function () {
var e1 = cold('---a|');
var e1subs = '^ !';
var e2 = cold('---b--|');
var e2subs = ' ^ !';
var e3 = cold('---c--|');
var e3subs = ' ^ !';
var expected = '---a---b-----c--|';
expectObservable(e1.concat(e2, e3, rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should accept scheduler without observable parameters', function () {
var e1 = cold('---a-|');
var e1subs = '^ !';
var expected = '---a-|';
expectObservable(e1.concat(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit self without parameters', function () {
var e1 = cold('---a-|');
var e1subs = '^ !';
var expected = '---a-|';
expectObservable(e1.concat()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
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