spec-js/operators/switch-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
var queueScheduler = Rx.Scheduler.queue;
/** @test {switch} */
describe('Observable.prototype.switch', function () {
asDiagram('switch')('should switch a hot observable of cold observables', function () {
var x = cold('--a---b--c---d--| ');
var y = cold('----e---f--g---|');
var e1 = hot('--x------y-------| ', { x: x, y: y });
var expected = '----a---b----e---f--g---|';
expectObservable(e1.switch()).toBe(expected);
});
it('should switch to each immediately-scheduled inner Observable', function (done) {
var a = Observable.of(1, 2, 3, queueScheduler);
var b = Observable.of(4, 5, 6, queueScheduler);
var r = [1, 4, 5, 6];
var i = 0;
Observable.of(a, b, queueScheduler)
.switch()
.subscribe(function (x) {
chai_1.expect(x).to.equal(r[i++]);
}, null, done);
});
it('should unsub inner observables', function () {
var unsubbed = [];
Observable.of('a', 'b').map(function (x) {
return Observable.create(function (subscriber) {
subscriber.complete();
return function () {
unsubbed.push(x);
};
});
})
.switch()
.subscribe();
chai_1.expect(unsubbed).to.deep.equal(['a', 'b']);
});
it('should switch to each inner Observable', function (done) {
var a = Observable.of(1, 2, 3);
var b = Observable.of(4, 5, 6);
var r = [1, 2, 3, 4, 5, 6];
var i = 0;
Observable.of(a, b).switch().subscribe(function (x) {
chai_1.expect(x).to.equal(r[i++]);
}, null, done);
});
it('should handle a hot observable of observables', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = ' ^ !';
var e1 = hot('------x-------y------| ', { x: x, y: y });
var expected = '--------a---b----d--e---f---|';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, outer is unsubscribed early', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = ' ^ ! ';
var e1 = hot('------x-------y------| ', { x: x, y: y });
var unsub = ' ! ';
var expected = '--------a---b--- ';
expectObservable(e1.switch(), unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = ' ^ ! ';
var e1 = hot('------x-------y------| ', { x: x, y: y });
var expected = '--------a---b---- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.switch()
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, inner never completes', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f-----');
var ysubs = ' ^ ';
var e1 = hot('------x-------y------| ', { x: x, y: y });
var expected = '--------a---b----d--e---f-----';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a synchronous switch to the second inner observable', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' (^!) ';
var y = cold('---d--e---f---| ');
var ysubs = ' ^ ! ';
var e1 = hot('------(xy)------------|', { x: x, y: y });
var expected = '---------d--e---f-----|';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, one inner throws', function () {
var x = cold('--a---# ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = [];
var e1 = hot('------x-------y------| ', { x: x, y: y });
var expected = '--------a---# ';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, outer throws', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = ' ^ ! ';
var e1 = hot('------x-------y-------# ', { x: x, y: y });
var expected = '--------a---b----d--e-# ';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle an empty hot observable', function () {
var e1 = hot('------|');
var e1subs = '^ !';
var expected = '------|';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a never hot observable', function () {
var e1 = hot('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete not before the outer completes', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var e1 = hot('------x---------------|', { x: x });
var e1subs = '^ !';
var expected = '--------a---b---c-----|';
expectObservable(e1.switch()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle an observable of promises', function (done) {
var expected = [3];
Observable.of(Promise.resolve(1), Promise.resolve(2), Promise.resolve(3))
.switch()
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, null, function () {
chai_1.expect(expected.length).to.equal(0);
done();
});
});
it('should handle an observable of promises, where last rejects', function (done) {
Observable.of(Promise.resolve(1), Promise.resolve(2), Promise.reject(3))
.switch()
.subscribe(function () {
done(new Error('should not be called'));
}, function (err) {
chai_1.expect(err).to.equal(3);
done();
}, function () {
done(new Error('should not be called'));
});
});
it('should handle an observable with Arrays in it', function () {
var expected = [1, 2, 3, 4];
var completed = false;
Observable.of(Observable.never(), Observable.never(), [1, 2, 3, 4])
.switch()
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, null, function () {
completed = true;
chai_1.expect(expected.length).to.equal(0);
});
chai_1.expect(completed).to.be.true;
});
it('should not leak when child completes before each switch (prevent memory leaks #2355)', function () {
var iStream;
var oStreamControl = new Rx.Subject();
var oStream = oStreamControl.map(function () {
return (iStream = new Rx.Subject());
});
var switcher = oStream.switch();
var result = [];
var sub = switcher.subscribe(function (x) { return result.push(x); });
[0, 1, 2, 3, 4].forEach(function (n) {
oStreamControl.next(n); // creates inner
iStream.complete();
});
// Expect one child of switch(): The oStream
chai_1.expect(sub._subscriptions[0]._subscriptions.length).to.equal(1);
sub.unsubscribe();
});
it('should not leak if we switch before child completes (prevent memory leaks #2355)', function () {
var oStreamControl = new Rx.Subject();
var oStream = oStreamControl.map(function () {
return (new Rx.Subject());
});
var switcher = oStream.switch();
var result = [];
var sub = switcher.subscribe(function (x) { return result.push(x); });
[0, 1, 2, 3, 4].forEach(function (n) {
oStreamControl.next(n); // creates inner
});
// Expect two children of switch(): The oStream and the first inner
chai_1.expect(sub._subscriptions[0]._subscriptions.length).to.equal(2);
sub.unsubscribe();
});
});
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