JezK

Edit File: startWith-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var rxjs_1 = require("rxjs");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('startWith', function () {
    var defaultStartValue = 'x';
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should prepend to a cold Observable', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' ---a--b--c--|');
            var e1subs = '  ^-----------!';
            var expected = 's--a--b--c--|';
            var result = e1.pipe((0, operators_1.startWith)('s'));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start an observable with given value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--|');
            var e1subs = '  ^----!';
            var expected = 'x-a--|';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and does not completes if source does not completes', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ----a-');
            var e1subs = '  ^-----';
            var expected = 'x---a-';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and does not completes if source never emits', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' - ');
            var e1subs = '  ^ ';
            var expected = 'x-';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and completes if source does not emits', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ---|');
            var e1subs = '  ^--!';
            var expected = 'x--|';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and complete immediately if 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 = '(x|)';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and source both if source emits single value', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' (a|)');
            var e1subs = '  (^!)';
            var expected = '(xa|)';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given values when given value is more than one', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----a--|');
            var e1subs = '  ^-------!';
            var expected = '(yz)-a--|';
            var result = e1.pipe((0, operators_1.startWith)('y', 'z'));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and raises error if source raises error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --#');
            var e1subs = '  ^-!';
            var expected = 'x-#';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected, defaultStartValue);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should start with given value and raises error immediately if source throws error', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' #   ');
            var e1subs = '  (^!)';
            var expected = '(x#)';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue));
            expectObservable(result).toBe(expected, defaultStartValue);
            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--|');
            var unsub = '   ---------!        ';
            var e1subs = '  ^--------!        ';
            var expected = 's--a--b---        ';
            var values = { s: 's', a: 'a', b: 'b' };
            var result = e1.pipe((0, operators_1.startWith)('s', testScheduler));
            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, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ---a--b----c--d--|');
            var e1subs = '  ^--------!        ';
            var expected = 's--a--b---        ';
            var unsub = '   ---------!        ';
            var values = { s: 's', a: 'a', b: 'b' };
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.startWith)('s', testScheduler), (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 start with empty if given value is not specified', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -a-|');
            var e1subs = '  ^--!';
            var expected = '-a-|';
            var result = e1.pipe((0, operators_1.startWith)(testScheduler));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should accept scheduler as last argument with single value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--|');
            var e1subs = '  ^----!';
            var expected = 'x-a--|';
            var result = e1.pipe((0, operators_1.startWith)(defaultStartValue, testScheduler));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should accept scheduler as last argument with multiple value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----a--|');
            var e1subs = '  ^-------!';
            var expected = '(yz)-a--|';
            var result = e1.pipe((0, operators_1.startWith)('y', 'z', testScheduler));
            expectObservable(result).toBe(expected);
            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.startWith)(-1), (0, operators_1.take)(4)).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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