spec-js/operators/switchMap-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {switchMap} */
describe('Observable.prototype.switchMap', function () {
asDiagram('switchMap(i => 10*i\u2014\u201410*i\u2014\u201410*i\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-y-yz-z-z---|';
var values = { x: 10, y: 30, z: 50 };
var result = e1.switchMap(function (x) { return e2.map(function (i) { return i * x; }); });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch with a selector function', function (done) {
var a = Observable.of(1, 2, 3);
var expected = ['a1', 'b1', 'c1', 'a2', 'b2', 'c2', 'a3', 'b3', 'c3'];
a.switchMap(function (x) { return Observable.of('a' + x, 'b' + x, 'c' + x); })
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, null, done);
});
it('should unsub inner observables', function () {
var unsubbed = [];
Observable.of('a', 'b').switchMap(function (x) {
return Observable.create(function (subscriber) {
subscriber.complete();
return function () {
unsubbed.push(x);
};
});
}).subscribe();
chai_1.expect(unsubbed).to.deep.equal(['a', 'b']);
});
it('should switch inner cold observables', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var y = cold('---f---g---h---i--|');
var ysubs = ' ^ !';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ !';
var expected = '-----------a--b--c----f---g---h---i--|';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when projection throws', function () {
var e1 = hot('-------x-----y---|');
var e1subs = '^ ! ';
var expected = '-------# ';
function project() {
throw 'error';
}
expectObservable(e1.switchMap(project)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when resultSelector throws', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ ! ';
var expected = '-----------# ';
function selector() {
throw 'error';
}
var result = e1.switchMap(function (value) { return x; }, selector);
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner cold observables, outer is unsubscribed early', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var y = cold('---f---g---h---i--|');
var ysubs = ' ^ ! ';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ ! ';
var unsub = ' ! ';
var expected = '-----------a--b--c---- ';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
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 = ' ^ ! ';
var y = cold('---f---g---h---i--|');
var ysubs = ' ^ ! ';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ ! ';
var expected = '-----------a--b--c---- ';
var unsub = ' ! ';
var observableLookup = { x: x, y: y };
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.switchMap(function (value) { return observableLookup[value]; })
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner cold observables, inner never completes', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var y = cold('---f---g---h---i--');
var ysubs = ' ^ ';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ ';
var expected = '-----------a--b--c----f---g---h---i--';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a synchronous switch to the second inner observable', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' (^!) ';
var y = cold('---f---g---h---i--| ');
var ysubs = ' ^ ! ';
var e1 = hot('---------(xy)----------------|');
var e1subs = '^ !';
var expected = '------------f---g---h---i----|';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner cold observables, one inner throws', function () {
var x = cold('--a--b--#--d--e--| ');
var xsubs = ' ^ ! ';
var y = cold('---f---g---h---i--');
var ysubs = [];
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ ! ';
var expected = '-----------a--b--# ';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner hot observables', function () {
var x = hot('-----a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var y = hot('--p-o-o-p-------------f---g---h---i--|');
var ysubs = ' ^ !';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ !';
var expected = '-----------c--d--e----f---g---h---i--|';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner empty and empty', function () {
var x = cold('|');
var y = cold('|');
var xsubs = ' (^!) ';
var ysubs = ' (^!) ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ !';
var expected = '-----------------------------|';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner empty and never', function () {
var x = cold('|');
var y = cold('-');
var xsubs = ' (^!) ';
var ysubs = ' ^ ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ ';
var expected = '------------------------------';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner never and empty', function () {
var x = cold('-');
var y = cold('|');
var xsubs = ' ^ ! ';
var ysubs = ' (^!) ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ !';
var expected = '-----------------------------|';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner never and throw', function () {
var x = cold('-');
var y = cold('#', null, 'sad');
var xsubs = ' ^ ! ';
var ysubs = ' (^!) ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ ! ';
var expected = '-------------------# ';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected, undefined, 'sad');
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch inner empty and throw', function () {
var x = cold('|');
var y = cold('#', null, 'sad');
var xsubs = ' (^!) ';
var ysubs = ' (^!) ';
var e1 = hot('---------x---------y---------|');
var e1subs = '^ ! ';
var expected = '-------------------# ';
var observableLookup = { x: x, y: y };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected, undefined, 'sad');
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle outer empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
var result = e1.switchMap(function (value) { return Observable.of(value); });
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle outer never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
var result = e1.switchMap(function (value) { return Observable.of(value); });
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle outer throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
var result = e1.switchMap(function (value) { return Observable.of(value); });
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle outer error', function () {
var x = cold('--a--b--c--d--e--|');
var xsubs = ' ^ ! ';
var e1 = hot('---------x---------# ');
var e1subs = '^ ! ';
var expected = '-----------a--b--c-# ';
var observableLookup = { x: x };
var result = e1.switchMap(function (value) { return observableLookup[value]; });
expectObservable(result).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should switch with resultSelector goodness', function () {
var x = cold('--a--b--c--d--e--| ');
var xsubs = ' ^ ! ';
var y = cold('---f---g---h---i--|');
var ysubs = ' ^ !';
var e1 = hot('---------x---------y---------| ');
var e1subs = '^ !';
var expected = '-----------a--b--c----f---g---h---i--|';
var observableLookup = { x: x, y: y };
var expectedValues = {
a: ['x', 'a', 0, 0],
b: ['x', 'b', 0, 1],
c: ['x', 'c', 0, 2],
f: ['y', 'f', 1, 0],
g: ['y', 'g', 1, 1],
h: ['y', 'h', 1, 2],
i: ['y', 'i', 1, 3]
};
var result = e1.switchMap(function (value) { return observableLookup[value]; }, function (innerValue, outerValue, innerIndex, outerIndex) { return [innerValue, outerValue, innerIndex, outerIndex]; });
expectObservable(result).toBe(expected, expectedValues);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
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