spec-js/operators/switchMapTo-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {switchMapTo} */
describe('Observable.prototype.switchMapTo', function () {
asDiagram('switchMapTo( 10\u2014\u201410\u2014\u201410\u2014| )')('should map-and-flatten each item to an Observable', function () {
var e1 = hot('--1-----3--5-------|');
var e1subs = '^ !';
var e2 = cold('x-x-x| ', { x: 10 });
var expected = '--x-x-x-x-xx-x-x---|';
var values = { x: 10 };
var result = e1.switchMapTo(e2);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch a synchronous many outer to a synchronous many inner', function (done) {
var a = Observable.of(1, 2, 3);
var expected = ['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c'];
a.switchMapTo(Observable.of('a', 'b', 'c')).subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, null, done);
});
it('should unsub inner observables', function () {
var unsubbed = 0;
Observable.of('a', 'b').switchMapTo(Observable.create(function (subscriber) {
subscriber.complete();
return function () {
unsubbed++;
};
})).subscribe();
chai_1.expect(unsubbed).to.equal(2);
});
it('should switch to an inner cold observable', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = [' ^ ! ',
// --a--b--c--d--e--|
' ^ !'];
var e1 = hot('---------x---------x---------| ');
var e1subs = '^ !';
var expected = '-----------a--b--c---a--b--c--d--e--|';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner cold observable, outer eventually throws', function () {
var x = cold('--a--b--c--d--e--|');
var xsubs = ' ^ ! ';
var e1 = hot('---------x---------# ');
var e1subs = '^ ! ';
var expected = '-----------a--b--c-# ';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner cold observable, outer is unsubscribed early', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = [' ^ ! ',
// --a--b--c--d--e--|
' ^ ! '];
var e1 = hot('---------x---------x---------|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = '-----------a--b--c---a- ';
expectObservable(e1.switchMapTo(x), unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = [' ^ ! ',
// --a--b--c--d--e--|
' ^ ! '];
var e1 = hot('---------x---------x---------|');
var e1subs = '^ ! ';
var expected = '-----------a--b--c---a- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.switchMapTo(x)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner cold observable, inner never completes', function () {
var x = cold('--a--b--c--d--e- ');
var xsubs = [' ^ ! ',
// --a--b--c--d--e-
' ^ '];
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ ';
var expected = '-----------a--b--c---a--b--c--d--e-';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a synchronous switch to the inner observable', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = [' (^!) ',
' ^ ! '];
var e1 = hot('---------(xx)----------------|');
var e1subs = '^ !';
var expected = '-----------a--b--c--d--e-----|';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner cold observable, inner raises an error', function () {
var x = cold('--a--b--# ');
var xsubs = ' ^ ! ';
var e1 = hot('---------x---------x---------|');
var e1subs = '^ ! ';
var expected = '-----------a--b--# ';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch an inner hot observable', function () {
var x = hot('--p-o-o-p---a--b--c--d-| ');
var xsubs = [' ^ ! ',
' ^ ! '];
var e1 = hot('---------x---------x---------|');
var e1subs = '^ !';
var expected = '------------a--b--c--d-------|';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner empty', function () {
var x = cold('|');
var xsubs = [' (^!) ',
' (^!) '];
var e1 = hot('---------x---------x---------|');
var e1subs = '^ !';
var expected = '-----------------------------|';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner never', function () {
var x = cold('-');
var xsubs = [' ^ ! ',
' ^ '];
var e1 = hot('---------x---------x---------|');
var e1subs = '^ ';
var expected = '------------------------------';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch to an inner that just raises an error', function () {
var x = cold('#');
var xsubs = ' (^!) ';
var e1 = hot('---------x---------x---------|');
var e1subs = '^ ! ';
var expected = '---------# ';
expectObservable(e1.switchMapTo(x)).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle an empty outer', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a never outer', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle an outer that just raises and error', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch with resultSelector goodness', function () {
var x = cold('--1--2--3--4--5--| ');
var xsubs = [' ^ ! ',
// --1--2--3--4--5--|
' ^ !'];
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ !';
var expected = '-----------a--b--c---d--e--f--g--h--|';
var expectedValues = {
a: ['x', '1', 0, 0],
b: ['x', '2', 0, 1],
c: ['x', '3', 0, 2],
d: ['y', '1', 1, 0],
e: ['y', '2', 1, 1],
f: ['y', '3', 1, 2],
g: ['y', '4', 1, 3],
h: ['y', '5', 1, 4]
};
var result = e1.switchMapTo(x, function (a, b, ai, bi) { return [a, b, ai, bi]; });
expectObservable(result).toBe(expected, expectedValues);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when resultSelector throws', function () {
var x = cold('--1--2--3--4--5--| ');
var xsubs = ' ^ ! ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ !';
var expected = '-----------#';
var result = e1.switchMapTo(x, function () {
throw 'error';
});
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
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