spec-js/operators/mapTo-spec.js

"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
// function shortcuts
var throwError = function () { throw new Error(); };
/** @test {mapTo} */
describe('Observable.prototype.mapTo', function () {
    asDiagram('mapTo(\'a\')')('should map multiple values', function () {
        var a = cold('--1--2--3--|');
        var asubs = '^          !';
        var expected = '--a--a--a--|';
        expectObservable(a.mapTo('a')).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should map one value', function () {
        var a = cold('--7--|');
        var asubs = '^    !';
        var expected = '--y--|';
        expectObservable(a.mapTo('y')).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should allow unsubscribing explicitly and early', function () {
        var a = cold('--1--2--3--|');
        var unsub = '      !     ';
        var asubs = '^     !     ';
        var expected = '--x--x-     ';
        expectObservable(a.mapTo('x'), unsub).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should propagate errors from observable that emits only errors', function () {
        var a = cold('--#', null, 'too bad');
        var asubs = '^ !';
        var expected = '--#';
        expectObservable(a.mapTo(1)).toBe(expected, null, 'too bad');
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should propagate errors from observable that emit values', function () {
        var a = cold('--1--2--#', undefined, 'too bad');
        var asubs = '^       !';
        var expected = '--x--x--#';
        expectObservable(a.mapTo('x')).toBe(expected, undefined, 'too bad');
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should propagate errors from subscribe', function () {
        var r = function () {
            Observable.of(1)
                .mapTo(-1)
                .subscribe(throwError);
        };
        chai_1.expect(r).to.throw();
    });
    it('should not map an empty observable', function () {
        var a = cold('|');
        var asubs = '(^!)';
        var expected = '|';
        expectObservable(a.mapTo(-1)).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should map twice', function () {
        var a = hot('-0----1-^-2---3--4-5--6--7-8-|');
        var asubs = '^                    !';
        var expected = '--h---h--h-h--h--h-h-|';
        var r = a.mapTo(-1).mapTo('h');
        expectObservable(r).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
    it('should not break unsubscription chain when unsubscribed explicitly', function () {
        var a = cold('--1--2--3--|');
        var unsub = '      !     ';
        var asubs = '^     !     ';
        var expected = '--x--x-     ';
        var r = a
            .mergeMap(function (x) { return Observable.of(x); })
            .mapTo('x')
            .mergeMap(function (x) { return Observable.of(x); });
        expectObservable(r, unsub).toBe(expected);
        expectSubscriptions(a.subscriptions).toBe(asubs);
    });
});
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