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Edit File: scan-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 testing_1 = require("rxjs/testing");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('scan', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should scan', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = {
                a: 1, b: 3, c: 5,
                x: 1, y: 4, z: 9,
            };
            var e1 = hot('  --a--b--c--|', values);
            var e1subs = '  ^----------!';
            var expected = '--x--y--z--|';
            var scanFunction = function (o, x) {
                return o + x;
            };
            expectObservable(e1.pipe((0, operators_1.scan)(scanFunction, 0))).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should scan 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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should provide the proper index if seed is skipped', function () {
        var expected = [1, 2];
        (0, rxjs_1.of)(3, 3, 3)
            .pipe((0, operators_1.scan)(function (_, __, i) {
            (0, chai_1.expect)(i).to.equal(expected.shift());
            return null;
        }))
            .subscribe();
    });
    it('should scan with a seed of undefined', 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: 'undefined b',
                v: 'undefined b c',
                w: 'undefined b c d',
                x: 'undefined b c d e',
                y: 'undefined b c d e f',
                z: 'undefined b c d e f g',
            };
            var source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc + ' ' + x; }, undefined));
            expectObservable(source).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should scan without seed', 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 = '   ---x--y--z--|';
            var values = {
                x: 'b',
                y: 'bc',
                z: 'bcd',
            };
            var source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc + x; }));
            expectObservable(source).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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    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'],
                w: ['b', 'c', 'd'],
                x: ['b', 'c', 'd', 'e'],
                y: ['b', 'c', 'd', 'e', 'f'],
                z: ['b', 'c', 'd', 'e', 'f', 'g'],
            };
            var source = e1.pipe((0, operators_1.scan)(function (acc, x) {
                if (x === 'd') {
                    throw 'bad!';
                }
                return acc.concat(x);
            }, []));
            expectObservable(source).toBe(expected, values, 'bad!');
            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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source).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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source).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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing explicitly and early', 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 unsub = '      --------------!       ';
            var e1subs = '     ^-------------!       ';
            var expected = '   ---u--v--w--x--       ';
            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 source = e1.pipe((0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []));
            expectObservable(source, 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, 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'],
                y: ['b', 'c', 'd', 'e', 'f'],
                z: ['b', 'c', 'd', 'e', 'f', 'g'],
            };
            var source = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.scan)(function (acc, x) { return acc.concat(x); }, []), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(source, unsub).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should pass current index to accumulator', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = {
                a: 1, b: 3, c: 5,
                x: 1, y: 4, z: 9,
            };
            var idx = [0, 1, 2];
            var e1 = hot('  --a--b--c--|', values);
            var e1subs = '  ^----------!';
            var expected = '--x--y--z--|';
            var scanFunction = function (o, value, index) {
                (0, chai_1.expect)(index).to.equal(idx.shift());
                return o + value;
            };
            var scanObs = e1.pipe((0, operators_1.scan)(scanFunction, 0), (0, operators_1.finalize)(function () {
                (0, chai_1.expect)(idx).to.be.empty;
            }));
            expectObservable(scanObs).toBe(expected, values);
            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.scan)(function (_acc, value) { return value; }, 0), (0, operators_1.take)(3))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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