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Edit File: debounce-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var rxjs_1 = require("rxjs");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('debounce', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    function getTimerSelector(x) {
        return function () { return (0, rxjs_1.timer)(x, testScheduler); };
    }
    it('should debounce values by a specified cold Observable', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -a----bc----d-ef----|');
            var e1subs = '  ^-------------------!';
            var e2 = cold('  ---x                ');
            var e2subs = [
                '               -^--!                ',
                '               ------^!             ',
                '               -------^--!          ',
                '               ------------^-!      ',
                '               --------------^!     ',
                '               ---------------^--!  ',
            ];
            var expected = '----a-----c-------f-|';
            var result = e1.pipe((0, operators_1.debounce)(function () { return e2; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(e2.subscriptions).toBe(e2subs);
        });
    });
    it('should delay all element by selector observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d---------|');
            var e1subs = '  ^--------------------!';
            var expected = '----a--b--c--d-------|';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should debounce by selector observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--bc--d----|');
            var e1subs = '  ^-------------!';
            var expected = '----a---c--d--|';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should support a scalar selector observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--bc--d----|');
            var e1subs = '  ^-------------!';
            var expected = '--a--bc--d----|';
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return (0, rxjs_1.of)(0); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should complete when source does not emit', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----|');
            var e1subs = '  ^----!';
            var expected = '-----|';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should complete when source is empty', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |');
            var e1subs = '  (^!)';
            var expected = '|';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when source does not emit and raises error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----#');
            var e1subs = '  ^----!';
            var expected = '-----#';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when source throws', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' #');
            var e1subs = '  (^!)';
            var expected = '#';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing early and explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--bc--d----|');
            var e1subs = '  ^------!       ';
            var expected = '----a---       ';
            var unsub = '   -------!       ';
            var result = e1.pipe((0, operators_1.debounce)(getTimerSelector(2)));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not break unsubscription chains when unsubscribed explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--bc--d----|');
            var e1subs = '  ^------!       ';
            var expected = '----a---       ';
            var unsub = '   -------!       ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.debounce)(getTimerSelector(2)), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should debounce and does not complete when source does not completes', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--bc--d---');
            var e1subs = '  ^            ';
            var expected = '----a---c--d-';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not complete when source does not complete', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not completes when source never completes', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should delay all element until source raises error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d---------#');
            var e1subs = '  ^--------------------!';
            var expected = '----a--b--c--d-------#';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(2)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should debounce all elements while source emits by selector observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ---a---b---c---d---e|');
            var e1subs = '  ^-------------------!';
            var expected = '--------------------(e|)';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(4)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should debounce all element while source emits by selector observable until raises error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d-#');
            var e1subs = '  ^------------!';
            var expected = '-------------#';
            expectObservable(e1.pipe((0, operators_1.debounce)(getTimerSelector(5)))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should delay element by same selector observable emits multiple', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('       ----a--b--c----d-----e-------|');
            var e1subs = '       ^----------------------------!';
            var expected = '     ------a--b--c----d-----e-----|';
            var selector = cold('--x-y-');
            var selectorSubs = [
                '                    ----^-!                      ',
                '                    -------^-!                   ',
                '                    ----------^-!                ',
                '                    ---------------^-!           ',
                '                    ---------------------^-!     ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector; }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
        });
    });
    it('should debounce by selector observable emits multiple', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ----a--b--c----d-----e-------|');
            var e1subs = '  ^----------------------------!';
            var expected = '------a-----c----------e-----|';
            var selector = [
                cold('              --x-y-                    '),
                cold('                 ----x-y-               '),
                cold('                    --x-y-              '),
                cold('                         ------x-y-     '),
                cold('                               --x-y-   '),
            ];
            var selectorSubs = [
                '               ----^-!                       ',
                '               -------^--!                   ',
                '               ----------^-!                 ',
                '               ---------------^-----!        ',
                '               ---------------------^-!      ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should debounce by selector observable until source completes', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ----a--b--c----d----e|    ');
            var e1subs = '  ^--------------------!    ';
            var expected = '------a-----c--------(e|) ';
            var selector = [
                cold('              --x-y-                '),
                cold('                 ----x-y-           '),
                cold('                    --x-y-          '),
                cold('                         ------x-y- '),
                cold('                              --x-y-'),
            ];
            var selectorSubs = [
                '               ----^-!                   ',
                '               -------^--!               ',
                '               ----------^-!             ',
                '               ---------------^----!     ',
                '               --------------------^!    ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should raise error when selector observable raises error', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a--------b--------c---------|');
            var e1subs = '  ^----------------------------!       ';
            var expected = '---------a---------b---------#       ';
            var selector = [
                cold('                  -x-y-                        '),
                cold('                           --x-y-              '),
                cold('                                    ---#       '),
            ];
            var selectorSubs = [
                '               --------^!                           ',
                '               -----------------^-!                 ',
                '               --------------------------^--!       ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should raise error when source raises error with selector observable', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a--------b--------c---------d#      ');
            var e1subs = '  ^------------------------------------!      ';
            var expected = '---------a---------b---------c-------#      ';
            var selector = [
                cold('                  -x-y-                               '),
                cold('                           --x-y-                     '),
                cold('                                    ---x-y-           '),
                cold('                                              ----x-y-'),
            ];
            var selectorSubs = [
                '               --------^!                                  ',
                '               -----------------^-!                        ',
                '               --------------------------^--!              ',
                '               ------------------------------------^!      ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should raise error when selector function throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a--------b--------c---------|');
            var e1subs = '  ^-------------------------!          ';
            var expected = '---------a---------b------#          ';
            var selector = [
                cold('                  -x-y-                        '),
                cold('                           --x-y-              '),
            ];
            var selectorSubs = [
                '               --------^!                           ',
                '               -----------------^-!                 ',
            ];
            function selectorFunction(x) {
                if (x !== 'c') {
                    return selector.shift();
                }
                else {
                    throw 'error';
                }
            }
            expectObservable(e1.pipe((0, operators_1.debounce)(selectorFunction))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should ignore all values except last, when given an empty selector Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a-x-yz---bxy---z--c--x--y--z|   ');
            var e1subs = '  ^-----------------------------------!   ';
            var expected = '------------------------------------(z|)';
            function selectorFunction(x) {
                return rxjs_1.EMPTY;
            }
            expectObservable(e1.pipe((0, operators_1.debounce)(selectorFunction))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should ignore all values except last, when given a never selector Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a-x-yz---bxy---z--c--x--y--z|  ');
            var e1subs = '  ^-----------------------------------!  ';
            var expected = '------------------------------------(z|)';
            function selectorFunction() {
                return rxjs_1.NEVER;
            }
            expectObservable(e1.pipe((0, operators_1.debounce)(selectorFunction))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not delay by selector observable completes when it does not emits', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --------a--------b--------c---------|   ');
            var e1subs = '  ^-----------------------------------!   ';
            var expected = '------------------------------------(c|)';
            var selector = [
                cold('                  -|                              '),
                cold('                           --|                    '),
                cold('                                    ---|          '),
            ];
            var selectorSubs = [
                '               --------^!                              ',
                '               -----------------^-!                    ',
                '               --------------------------^--!          ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should not debounce by selector observable completes when it does not emits', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ----a--b-c---------de-------------|   ');
            var e1subs = '  ^---------------------------------!   ';
            var expected = '----------------------------------(e|)';
            var selector = [
                cold('              -|                                '),
                cold('                 --|                            '),
                cold('                   ---|                         '),
                cold('                             ----|              '),
                cold('                              -----|            '),
            ];
            var selectorSubs = [
                '               ----^!                                ',
                '               -------^-!                            ',
                '               ---------^--!                         ',
                '               -------------------^!                 ',
                '               --------------------^----!            ',
            ];
            expectObservable(e1.pipe((0, operators_1.debounce)(function () { return selector.shift(); }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            for (var i = 0; i < selectorSubs.length; i++) {
                expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
            }
        });
    });
    it('should delay by promise resolves', function (done) {
        var e1 = (0, rxjs_1.concat)((0, rxjs_1.of)(1), (0, rxjs_1.timer)(10).pipe((0, operators_1.mapTo)(2)), (0, rxjs_1.timer)(10).pipe((0, operators_1.mapTo)(3)), (0, rxjs_1.timer)(100).pipe((0, operators_1.mapTo)(4)));
        var expected = [1, 2, 3, 4];
        e1.pipe((0, operators_1.debounce)(function () {
            return new Promise(function (resolve) {
                resolve(42);
            });
        })).subscribe({
            next: function (x) {
                (0, chai_1.expect)(x).to.equal(expected.shift());
            },
            error: function (x) {
                done(new Error('should not be called'));
            },
            complete: function () {
                (0, chai_1.expect)(expected.length).to.equal(0);
                done();
            },
        });
    });
    it('should raises error when promise rejects', function (done) {
        var e1 = (0, rxjs_1.concat)((0, rxjs_1.of)(1), (0, rxjs_1.timer)(10).pipe((0, operators_1.mapTo)(2)), (0, rxjs_1.timer)(10).pipe((0, operators_1.mapTo)(3)), (0, rxjs_1.timer)(100).pipe((0, operators_1.mapTo)(4)));
        var expected = [1, 2];
        var error = new Error('error');
        e1.pipe((0, operators_1.debounce)(function (x) {
            if (x === 3) {
                return new Promise(function (resolve, reject) {
                    reject(error);
                });
            }
            else {
                return new Promise(function (resolve) {
                    resolve(42);
                });
            }
        })).subscribe({
            next: function (x) {
                (0, chai_1.expect)(x).to.equal(expected.shift());
            },
            error: function (err) {
                (0, chai_1.expect)(err).to.be.an('error', 'error');
                (0, chai_1.expect)(expected.length).to.equal(0);
                done();
            },
            complete: function () {
                done(new Error('should not be called'));
            },
        });
    });
    it('should debounce correctly when synchronously reentered', function () {
        var results = [];
        var source = new rxjs_1.Subject();
        source.pipe((0, operators_1.debounce)(function () { return (0, rxjs_1.of)(null); })).subscribe(function (value) {
            results.push(value);
            if (value === 1) {
                source.next(2);
            }
        });
        source.next(1);
        (0, chai_1.expect)(results).to.deep.equal([1, 2]);
    });
    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.debounce)(function () { return (0, rxjs_1.of)(0); }), (0, operators_1.take)(3))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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