@reactivex/rxjs/spec-js/operators/concat-spec.js

Reactive Extensions for modern JavaScript

"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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