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Edit File: takeWhile-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('takeWhile', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should take all elements until predicate is false', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1-^2--3--4--5--6--|');
            var e1subs = '   ^------!         ';
            var expected = ' -2--3--|         ';
            var result = e1.pipe((0, operators_1.takeWhile)(function (v) { return +v < 4; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take all elements with predicate returns true', 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 = '  --b--c--d--e--|';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take all elements with truthy predicate', 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 = '  --b--c--d--e--|';
            var result = e1.pipe((0, operators_1.takeWhile)((function () {
                return {};
            })));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip all elements with predicate returns false', 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 = '  --|            ';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return false; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip all elements with falsy predicate', 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 = '  --|            ';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return null; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take all elements until predicate return false', 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 = '  --b--c--|      ';
            function predicate(value) {
                return value !== 'd';
            }
            var result = e1.pipe((0, operators_1.takeWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take all elements up to and including the element that made the predicate return false', 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 = '  --b--c--(d|)   ';
            function predicate(value) {
                return value !== 'd';
            }
            var inclusive = true;
            var result = e1.pipe((0, operators_1.takeWhile)(predicate, inclusive));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take elements with predicate when source does not complete', 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 = '  --b--c--d--e--';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not complete 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 = '-';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).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('--a-^------------|');
            var e1subs = '    ^------------!';
            var expected = '  -------------|';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).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 = '|   ';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should pass element index to predicate', 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 = '  --b--c--|      ';
            function predicate(value, index) {
                return index < 2;
            }
            var result = e1.pipe((0, operators_1.takeWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when 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--e--#');
            var e1subs = '    ^-------------!';
            var expected = '  --b--c--d--e--#';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).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 = '#   ';
            var result = e1.pipe((0, operators_1.takeWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should invoke predicate until return false', 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 = '  --b--c--|      ';
            var invoked = 0;
            function predicate(value) {
                invoked++;
                return value !== 'd';
            }
            var result = e1.pipe((0, operators_1.takeWhile)(predicate), (0, operators_1.tap)({
                complete: function () {
                    (0, chai_1.expect)(invoked).to.equal(3);
                },
            }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error if predicate throws', 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 = '  --#            ';
            function predicate(value) {
                throw 'error';
            }
            var result = e1.pipe((0, operators_1.takeWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take elements until unsubscribed', 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 = '  --b---         ';
            function predicate(value) {
                return value !== 'd';
            }
            var result = e1.pipe((0, operators_1.takeWhile)(predicate));
            expectObservable(result, unsub).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 = '  --b---         ';
            function predicate(value) {
                return value !== 'd';
            }
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.takeWhile)(predicate), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should support type guards without breaking previous behavior', function () {
        {
            var Foo = (function () {
                function Foo(bar, baz) {
                    if (bar === void 0) { bar = 'name'; }
                    if (baz === void 0) { baz = 42; }
                    this.bar = bar;
                    this.baz = baz;
                }
                return Foo;
            }());
            var isBar = function (x) { return x && x.bar !== undefined; };
            var foo = new Foo();
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.takeWhile)(function (foo) { return foo.baz === 42; }))
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.takeWhile)(isBar))
                .subscribe(function (x) { return x.bar; });
            var foobar = new Foo();
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.takeWhile)(function (foobar) { return foobar.bar === 'name'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.takeWhile)(isBar))
                .subscribe(function (x) { return x.bar; });
            var barish = { bar: 'quack', baz: 42 };
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.takeWhile)(function (x) { return x.bar === 'quack'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.takeWhile)(isBar))
                .subscribe(function (bar) { return bar.bar; });
        }
        {
            var xs = (0, rxjs_1.from)([1, 'aaa', 3, 'bb']);
            var isString = function (x) { return typeof x === 'string'; };
            xs.pipe((0, operators_1.takeWhile)(isString)).subscribe(function (s) { return s.length; });
            xs.pipe((0, operators_1.takeWhile)(function (x) { return typeof x === 'number'; })).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.takeWhile)(function (x, i) { return typeof x === 'number' && x > i; })).subscribe(function (x) { return x; });
        }
    });
    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.takeWhile)(function (value) { return value < 2; })).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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