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Edit File: switchMap-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var rxjs_1 = require("rxjs");
var interop_helper_1 = require("../helpers/interop-helper");
var testing_1 = require("rxjs/testing");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('switchMap', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should map-and-flatten each item to an Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.switchMap)(function (x) { return e2.pipe((0, operators_1.map)(function (i) { return i * +x; })); }));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should support the deprecated resultSelector', function () {
        var results = [];
        (0, rxjs_1.of)(1, 2, 3)
            .pipe((0, operators_1.switchMap)(function (x) { return (0, rxjs_1.of)(x, x + 1, x + 2); }, function (a, b, i, ii) { return [a, b, i, ii]; }))
            .subscribe({
            next: function (value) {
                results.push(value);
            },
            error: function (err) {
                throw err;
            },
            complete: function () {
                (0, chai_1.expect)(results).to.deep.equal([
                    [1, 1, 0, 0],
                    [1, 2, 0, 1],
                    [1, 3, 0, 2],
                    [2, 2, 1, 0],
                    [2, 3, 1, 1],
                    [2, 4, 1, 2],
                    [3, 3, 2, 0],
                    [3, 4, 2, 1],
                    [3, 5, 2, 2],
                ]);
            },
        });
    });
    it('should support a void resultSelector (still deprecated)', function () {
        var results = [];
        (0, rxjs_1.of)(1, 2, 3)
            .pipe((0, operators_1.switchMap)(function (x) { return (0, rxjs_1.of)(x, x + 1, x + 2); }, void 0))
            .subscribe({
            next: function (value) {
                results.push(value);
            },
            error: function (err) {
                throw err;
            },
            complete: function () {
                (0, chai_1.expect)(results).to.deep.equal([1, 2, 3, 2, 3, 4, 3, 4, 5]);
            },
        });
    });
    it('should unsub inner observables', function () {
        var unsubbed = [];
        (0, rxjs_1.of)('a', 'b')
            .pipe((0, operators_1.switchMap)(function (x) {
            return new rxjs_1.Observable(function (subscriber) {
                subscriber.complete();
                return function () {
                    unsubbed.push(x);
                };
            });
        }))
            .subscribe();
        (0, chai_1.expect)(unsubbed).to.deep.equal(['a', 'b']);
    });
    it('should switch inner cold observables', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -------x-----y---|');
            var e1subs = '  ^------!          ';
            var expected = '-------#          ';
            function project() {
                throw 'error';
            }
            expectObservable(e1.pipe((0, operators_1.switchMap)(project))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should switch inner cold observables, outer is unsubscribed early', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.switchMap)(function (value) { return observableLookup[value]; }), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            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 with interop inners when result is unsubscribed explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.switchMap)(function (value) { return (0, interop_helper_1.asInteropObservable)(observableLookup[value]); }), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(x.subscriptions).toBe(xsubs);
            expectSubscriptions(y.subscriptions).toBe(ysubs);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should stop listening to a synchronous observable when unsubscribed', function () {
        var sideEffects = [];
        var synchronousObservable = (0, rxjs_1.concat)((0, rxjs_1.defer)(function () {
            sideEffects.push(1);
            return (0, rxjs_1.of)(1);
        }), (0, rxjs_1.defer)(function () {
            sideEffects.push(2);
            return (0, rxjs_1.of)(2);
        }), (0, rxjs_1.defer)(function () {
            sideEffects.push(3);
            return (0, rxjs_1.of)(3);
        }));
        (0, rxjs_1.of)(null)
            .pipe((0, operators_1.switchMap)(function () { return synchronousObservable; }), (0, operators_1.takeWhile)(function (x) { return x != 2; }))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([1, 2]);
    });
    it('should switch inner cold observables, inner never completes', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var x = cold('           -                    ');
            var y = cold('                     #          ', undefined, 'sad');
            var xsubs = '   ---------^---------!          ';
            var ysubs = '   -------------------(^!)       ';
            var e1 = hot('  ---------x---------y---------|');
            var e1subs = '  ^------------------!          ';
            var expected = '-------------------#          ';
            var observableLookup = { x: x, y: y };
            var result = e1.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var x = cold('           |                    ');
            var y = cold('                     #          ', undefined, 'sad');
            var xsubs = '   ---------(^!)                 ';
            var ysubs = '   -------------------(^!)       ';
            var e1 = hot('  ---------x---------y---------|');
            var e1subs = '  ^------------------!          ';
            var expected = '-------------------#          ';
            var observableLookup = { x: x, y: y };
            var result = e1.pipe((0, operators_1.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 () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '|   ';
            var result = e1.pipe((0, operators_1.switchMap)(function (value) { return (0, rxjs_1.of)(value); }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle outer never', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var e1subs = '  ^';
            var expected = '-';
            var result = e1.pipe((0, operators_1.switchMap)(function (value) { return (0, rxjs_1.of)(value); }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle outer throw', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' #   ');
            var e1subs = '  (^!)';
            var expected = '#   ';
            var result = e1.pipe((0, operators_1.switchMap)(function (value) { return (0, rxjs_1.of)(value); }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle outer error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            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.pipe((0, operators_1.switchMap)(function (value) { return observableLookup[value]; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(x.subscriptions).toBe(xsubs);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should stop listening to a synchronous observable when unsubscribed', function () {
        var sideEffects = [];
        var synchronousObservable = new rxjs_1.Observable(function (subscriber) {
            for (var i = 0; !subscriber.closed && i < 10; i++) {
                sideEffects.push(i);
                subscriber.next(i);
            }
        });
        synchronousObservable
            .pipe((0, operators_1.switchMap)(function (value) { return (0, rxjs_1.of)(value); }), (0, operators_1.take)(3))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
    it('should unsubscribe previous inner sub when getting synchronously reentrance during subscribing the inner sub', function () {
        var e = new rxjs_1.BehaviorSubject(1);
        var results = [];
        e.pipe((0, operators_1.take)(3), (0, operators_1.switchMap)(function (value) {
            return new rxjs_1.Observable(function (subscriber) {
                e.next(value + 1);
                subscriber.next(value);
            });
        })).subscribe(function (value) { return results.push(value); });
        (0, chai_1.expect)(results).to.deep.equal([3]);
    });
});
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