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Edit File: skipLast-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('skipLast operator', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should skip 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.skipLast)(2))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip last three 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--|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(3))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip all elements when trying to skip larger then source', 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 = '--------------------|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(5))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip all elements when trying to skip exact', 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 = '--------------------|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(4))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not skip any 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----c---d--|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(0))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not skip any values 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 e1subs = '  ^-------------------!';
            var expected = '--a-----b----c---d--|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(-42))).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.skipLast)(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.skipLast)(42))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip one value from 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 = '---|   ';
            expectObservable(e1.pipe((0, operators_1.skipLast)(1))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should skip one value from 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---c--|';
            expectObservable(e1.pipe((0, operators_1.skipLast)(1))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should work with empty and early emission', 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.skipLast)(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.skipLast)(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 = ' ---------#';
            expectObservable(e1.pipe((0, operators_1.skipLast)(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 = ' ----------            ';
            expectObservable(e1.pipe((0, operators_1.skipLast)(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.skipLast)(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 = ' ----------            ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.skipLast)(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 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.skipLast)(1), (0, operators_1.take)(3)).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2, 3]);
    });
});
//# sourceMappingURL=skipLast-spec.js.map

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