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Edit File: take-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('take', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should take two values of an observable with many values', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' --a-----b----c---d--|');
            var e1subs = '  ^-------!------------';
            var expected = '--a-----(b|)         ';
            expectObservable(e1.pipe((0, operators_1.take)(2))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should work with 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.take)(42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should go on forever on never', 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.take)(42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should be empty on take(0)', 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.take)(0))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should be empty if provided with negative value', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' --a-----b----c---d--|');
            var expected = '|';
            var e1subs = [];
            expectObservable(e1.pipe((0, operators_1.take)(-42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take one value of an observable with one value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ---(a|)');
            var e1subs = '  ^--!---';
            var expected = '---(a|)';
            expectObservable(e1.pipe((0, operators_1.take)(1))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take one values of an observable with many values', 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 = '   ---(b|)         ';
            expectObservable(e1.pipe((0, operators_1.take)(1))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should error on empty', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^----|');
            var e1subs = '     ^----!';
            var expected = '   -----|';
            expectObservable(e1.pipe((0, operators_1.take)(42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate error from the source observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('---^---#', undefined, 'too bad');
            var e1subs = '   ^---!';
            var expected = ' ----#';
            expectObservable(e1.pipe((0, operators_1.take)(42))).toBe(expected, null, 'too bad');
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate error from an observable with values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('---^--a--b--#');
            var e1subs = '   ^--------!';
            var expected = ' ---a--b--#';
            expectObservable(e1.pipe((0, operators_1.take)(42))).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--|');
            var unsub = '    ---------!------------';
            var e1subs = '   ^--------!------------';
            var expected = ' ---a--b---            ';
            expectObservable(e1.pipe((0, operators_1.take)(42)), unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should work with throw', 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.take)(42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not break unsubscription chain when 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--|');
            var unsub = '    ---------!            ';
            var e1subs = '   ^--------!            ';
            var expected = ' ---a--b---            ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.take)(42), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should unsubscribe from the source when it reaches the limit', function () {
        var source = new rxjs_1.Observable(function (observer) {
            (0, chai_1.expect)(observer.closed).to.be.false;
            observer.next(42);
            (0, chai_1.expect)(observer.closed).to.be.true;
        }).pipe((0, operators_1.take)(1));
        source.subscribe();
    });
    it('should complete when the source is reentrant', function () {
        var completed = false;
        var source = new rxjs_1.Subject();
        source.pipe((0, operators_1.take)(5)).subscribe({
            next: function () {
                source.next();
            },
            complete: function () {
                completed = true;
            },
        });
        source.next();
        (0, chai_1.expect)(completed).to.be.true;
    });
    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.take)(3)).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
    it('should complete even if the parameter is a string', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' --a-----b----c---d--|');
            var e1subs = '  ^-------!------------';
            var expected = '--a-----(b|)         ';
            expectObservable(e1.pipe((0, operators_1.take)('2'))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it.skip('should unsubscribe from the source when it reaches the limit before a recursive synchronous upstream error is notified', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var subject = new rxjs_1.Subject();
            var e1 = cold(' (a|)');
            var e1subs = '  (^!)';
            var expected = '(a|)';
            var result = (0, rxjs_1.merge)(e1, subject).pipe((0, operators_1.take)(1), (0, operators_1.tap)(function () { return subject.error('error'); }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
});
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