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Edit File: mergeScan-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var testing_1 = require("rxjs/testing");
var rxjs_1 = require("rxjs");
var operators_1 = require("rxjs/operators");
var chai_1 = require("chai");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('mergeScan', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should mergeScan things', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------------------!';
            var expected = '   ---u--v--w--x--y--z--|';
            var values = {
                u: ['b'],
                v: ['b', 'c'],
                w: ['b', 'c', 'd'],
                x: ['b', 'c', 'd', 'e'],
                y: ['b', 'c', 'd', 'e', 'f'],
                z: ['b', 'c', 'd', 'e', 'f', 'g'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle errors', 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 = '   ---u--v--w--#';
            var values = {
                u: ['b'],
                v: ['b', 'c'],
                w: ['b', 'c', 'd'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should mergeScan values and be able to asynchronously project them', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------------------!';
            var t = time('        --|                ');
            var expected = '   -----u--v--w--x--y--z|';
            var values = {
                u: ['b'],
                v: ['b', 'c'],
                w: ['b', 'c', 'd'],
                x: ['b', 'c', 'd', 'e'],
                y: ['b', 'c', 'd', 'e', 'f'],
                z: ['b', 'c', 'd', 'e', 'f', 'g'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)).pipe((0, operators_1.delay)(t)); }, []));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not stop ongoing async projections when source completes', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|     ');
            var e1subs = '     ^--------------------!     ';
            var t = time('        -----|');
            var expected = '   --------u--v--w--x--y--(z|)';
            var values = {
                u: ['b'],
                v: ['c'],
                w: ['b', 'd'],
                x: ['c', 'e'],
                y: ['b', 'd', 'f'],
                z: ['c', 'e', 'g'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)).pipe((0, operators_1.delay)(t)); }, []));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should interrupt ongoing async projections when result is unsubscribed early', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^---------------!     ';
            var t = time('        -----|');
            var expected = '   --------u--v--w--     ';
            var unsub = '      ----------------!     ';
            var values = {
                u: ['b'],
                v: ['c'],
                w: ['b', 'd'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)).pipe((0, operators_1.delay)(t)); }, []));
            expectObservable(result, unsub).toBe(expected, values);
            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, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^---------------!     ';
            var t = time('        -----|');
            var expected = '   --------u--v--w--     ';
            var unsub = '      ----------------!     ';
            var values = {
                u: ['b'],
                v: ['c'],
                w: ['b', 'd'],
            };
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)).pipe((0, operators_1.delay)(t)); }, []), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected, values);
            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.mergeScan)(function () { return synchronousObservable; }, 0), (0, operators_1.takeWhile)(function (x) { return x != 2; }))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([1, 2]);
    });
    it('should handle errors in the projection function', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------!';
            var expected = '   ---u--v--#';
            var values = {
                u: ['b'],
                v: ['b', 'c'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) {
                if (x === 'd') {
                    throw new Error('bad!');
                }
                return (0, rxjs_1.of)(acc.concat(x));
            }, []));
            expectObservable(result).toBe(expected, values, new Error('bad!'));
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate errors from the projected Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--!';
            var expected = '   ---#';
            var result = e1.pipe((0, operators_1.mergeScan)(function () { return (0, rxjs_1.throwError)(function () { return new Error('bad!'); }); }, []));
            expectObservable(result).toBe(expected, undefined, new Error('bad!'));
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle an empty projected Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------------------!';
            var expected = '   ---------------------|';
            var result = e1.pipe((0, operators_1.mergeScan)(function () { return rxjs_1.EMPTY; }, []));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle a never projected Observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------------------!';
            var expected = '   ----------------------';
            var result = e1.pipe((0, operators_1.mergeScan)(function () { return rxjs_1.NEVER; }, []));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('handle 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.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('handle 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.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('handle 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.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should mergeScan unsubscription', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^-------------!       ';
            var expected = '   ---u--v--w--x--       ';
            var unsub = '      --------------!       ';
            var values = {
                u: ['b'],
                v: ['b', 'c'],
                w: ['b', 'c', 'd'],
                x: ['b', 'c', 'd', 'e'],
            };
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return (0, rxjs_1.of)(acc.concat(x)); }, []));
            expectObservable(result, unsub).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should mergeScan projects cold Observable with single concurrency', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var inner = [
                cold('            --d--e--f--|                      '),
                cold('                       --g--h--i--|           '),
                cold('                                  --j--k--l--|'),
            ];
            var xsubs = '   --^----------!                      ';
            var ysubs = '   -------------^----------!           ';
            var zsubs = '   ------------------------^----------!';
            var e1 = hot('  --0--1--2--|                        ');
            var e1subs = '  ^----------!                        ';
            var expected = '--x-d--e--f--f-g--h--i--i-j--k--l--|';
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return inner[+x].pipe((0, operators_1.startWith)(acc)); }, 'x', 1));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
            expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
            expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
        });
    });
    it('should not emit accumulator if inner completes without value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^--b--c--d--e--f--g--|');
            var e1subs = '     ^--------------------!';
            var expected = '   ---------------------|';
            var result = e1.pipe((0, operators_1.mergeScan)(function () { return rxjs_1.EMPTY; }, ['1']));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not emit accumulator if inner completes without value after source completes', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var x = cold('        -----|   ');
            var xsubs = [
                '                  ---^----!   ',
                '                  ------^----!',
            ];
            var e1 = hot('--a--^--b--c--|  ');
            var e1subs = '     ^--------!  ';
            var expected = '   -----------|';
            var result = e1.pipe((0, operators_1.mergeScan)(function () { return x; }, '1'));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(x.subscriptions).toBe(xsubs);
        });
    });
    it('should mergeScan projects hot Observable with single concurrency', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var inner = [
                hot('           --d--e--f--|                 '),
                hot('           ----g----h----i----|         '),
                hot('           ------j------k-------l------|'),
            ];
            var xsubs = '   ---^-------!                 ';
            var ysubs = '   -----------^-------!         ';
            var zsubs = '   -------------------^--------!';
            var e1 = hot('  ---0---1---2---|             ');
            var e1subs = '  ^--------------!             ';
            var expected = '---x-e--f--f--i----i-l------|';
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return inner[+x].pipe((0, operators_1.startWith)(acc)); }, 'x', 1));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
            expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
            expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
        });
    });
    it('should mergeScan projects cold Observable with dual concurrency', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var inner = [
                cold('              ---d---e---f---|               '),
                cold('                   ---g---h---i---|          '),
                cold('                             ---j---k---l---|'),
            ];
            var xsubs = '   ----^--------------!               ';
            var ysubs = '   ---------^--------------!          ';
            var zsubs = '   -------------------^--------------!';
            var e1 = hot('  ----0----1----2----|               ');
            var e1subs = '  ^------------------!               ';
            var expected = '----x--d-d-eg--fh--hi-j---k---l---|';
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return inner[+x].pipe((0, operators_1.startWith)(acc)); }, 'x', 2));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
            expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
            expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
        });
    });
    it('should mergeScan projects hot Observable with dual concurrency', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var inner = [
                hot('           --d--e--f-----|              '),
                hot('           ----g----h------i----|       '),
                hot('           ------j--------k-----l------|'),
            ];
            var xsubs = '   ---^----------!              ';
            var ysubs = '   -------^-------------!       ';
            var zsubs = '   --------------^-------------!';
            var e1 = hot('  ---0---1---2---|             ');
            var e1subs = '  ^--------------!             ';
            var expected = '---x-e-efh----hki----l------|';
            var result = e1.pipe((0, operators_1.mergeScan)(function (acc, x) { return inner[+x].pipe((0, operators_1.startWith)(acc)); }, 'x', 2));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
            expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
            expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
            expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
        });
    });
    it('should pass current index to accumulator', function () {
        var recorded = [];
        var e1 = (0, rxjs_1.of)('a', 'b', 'c', 'd');
        e1.pipe((0, operators_1.mergeScan)(function (acc, x, index) {
            recorded.push(index);
            return (0, rxjs_1.of)(index);
        }, 0)).subscribe();
        (0, chai_1.expect)(recorded).to.deep.equal([0, 1, 2, 3]);
    });
    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.mergeScan)(function (acc, value) { return (0, rxjs_1.of)(value); }, 0), (0, operators_1.take)(3))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
//# sourceMappingURL=mergeScan-spec.js.map

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