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Edit File: skipWhile-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('skipWhile', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should skip all elements until predicate is false', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('-1-^2--3--4--5--6--|');
            var sourceSubs = '   ^---------------!';
            var expected = '     -------4--5--6--|';
            var predicate = function (v) {
                return +v < 4;
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should skip all elements with a true predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('-1-^2--3--4--5--6--|');
            var sourceSubs = '   ^---------------!';
            var expected = '     ----------------|';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should skip all elements with a truthy predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('-1-^2--3--4--5--6--|');
            var sourceSubs = '   ^---------------!';
            var expected = '     ----------------|';
            var result = source.pipe((0, operators_1.skipWhile)(function () {
                return {};
            }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should not skip any element with a false predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('-1-^2--3--4--5--6--|');
            var sourceSubs = '   ^---------------!';
            var expected = '     -2--3--4--5--6--|';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return false; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should not skip any elements with a falsy predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('-1-^2--3--4--5--6--|');
            var sourceSubs = '   ^---------------!';
            var expected = '     -2--3--4--5--6--|';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return undefined; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should skip elements on hot source', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--1--2-^-3--4--5--6--7--8--');
            var sourceSubs = '       ^-------------------';
            var expected = '         --------5--6--7--8--';
            var predicate = function (v) {
                return +v < 5;
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it("should be possible to skip using the element's index", function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--a--b-^-c--d--e--f--g--h--|');
            var sourceSubs = '       ^-------------------!';
            var expected = '         --------e--f--g--h--|';
            var predicate = function (_v, index) {
                return index < 2;
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should skip using index with source unsubscribes early', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--a--b-^-c--d--e--f--g--h--|');
            var sourceSubs = '       ^----------!         ';
            var unsub = '            -----------!         ';
            var expected = '         -----d--e---         ';
            var predicate = function (_v, index) {
                return index < 1;
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    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 source = hot('--a--b-^-c--d--e--f--g--h--|');
            var sourceSubs = '       ^----------!         ';
            var expected = '         -----d--e---         ';
            var unsub = '            -----------!         ';
            var predicate = function (_v, index) {
                return index < 1;
            };
            var result = source.pipe((0, operators_1.mergeMap)(function (x) {
                return (0, rxjs_1.of)(x);
            }), (0, operators_1.skipWhile)(predicate), (0, operators_1.mergeMap)(function (x) {
                return (0, rxjs_1.of)(x);
            }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should skip using value with source throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--a--b-^-c--d--e--f--g--h--#');
            var sourceSubs = '       ^-------------------!';
            var expected = '         -----d--e--f--g--h--#';
            var predicate = function (v) {
                return v !== 'd';
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should invoke predicate while its false and never again', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--a--b-^-c--d--e--f--g--h--|');
            var sourceSubs = '       ^-------------------!';
            var expected = '         --------e--f--g--h--|';
            var invoked = 0;
            var predicate = function (v) {
                invoked++;
                return v !== 'e';
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate), (0, operators_1.tap)({
                complete: function () {
                    (0, chai_1.expect)(invoked).to.equal(3);
                },
            }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should handle predicate that throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = hot('--a--b-^-c--d--e--f--g--h--|');
            var sourceSubs = '       ^-------!            ';
            var expected = '         --------#            ';
            var predicate = function (v) {
                if (v === 'e') {
                    throw new Error("nom d'une pipe !");
                }
                return v !== 'f';
            };
            var result = source.pipe((0, operators_1.skipWhile)(predicate));
            expectObservable(result).toBe(expected, undefined, new Error("nom d'une pipe !"));
            expectSubscriptions(source.subscriptions).toBe(sourceSubs);
        });
    });
    it('should handle Observable.empty', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = cold('|   ');
            var subs = '       (^!)';
            var expected = '   |   ';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(subs);
        });
    });
    it('should handle Observable.never', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = cold('-');
            var subs = '       ^';
            var expected = '   -';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(subs);
        });
    });
    it('should handle Observable.throw', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var source = cold('#   ');
            var subs = '       (^!)';
            var expected = '   #   ';
            var result = source.pipe((0, operators_1.skipWhile)(function () { return true; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(source.subscriptions).toBe(subs);
        });
    });
    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.skipWhile)(function (value) { return value < 2; }), (0, operators_1.take)(1))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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