JezK

Edit File: elementAt-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('elementAt', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should return next to last element by zero-based index', 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 = '--------(c|)   ';
            expectObservable(e1.pipe((0, operators_1.elementAt)(2))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return first element by zero-based index', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--|');
            var e1subs = '  ^-!';
            var expected = '--(a|)';
            expectObservable(e1.pipe((0, operators_1.elementAt)(0))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow undefined as a default value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----a--a---a-|   ');
            var e1subs = '  ^-------------!   ';
            var expected = '--------------(U|)';
            expectObservable(e1.pipe((0, operators_1.elementAt)(100, undefined))).toBe(expected, { U: undefined });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return non-first element by zero-based index', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|');
            var e1subs = '  ^----------!         ';
            var expected = '-----------(d|)      ';
            expectObservable(e1.pipe((0, operators_1.elementAt)(3))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return last element by zero-based index', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--|');
            var e1subs = '  ^-------!   ';
            var expected = '--------(c|)';
            expectObservable(e1.pipe((0, operators_1.elementAt)(2))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error if e1 is Empty Observable', 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.elementAt)(0))).toBe(expected, undefined, new rxjs_1.ArgumentOutOfRangeError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error if source throws', 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.elementAt)(0))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not complete if source never completes', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var expected = '-';
            var e1subs = '  ^';
            expectObservable(e1.pipe((0, operators_1.elementAt)(0))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing early and explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--|');
            var e1subs = '  ^-----!     ';
            var expected = '-------     ';
            var unsub = '   ------!     ';
            var result = e1.pipe((0, operators_1.elementAt)(2));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not break unsubscription chains when result Observable is unsubscribed', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--|');
            var e1subs = '  ^-----!     ';
            var expected = '-------     ';
            var unsub = '   ------!     ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.elementAt)(2), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should throw if index is smaller than zero', function () {
        (0, chai_1.expect)(function () {
            (0, rxjs_1.range)(0, 10).pipe((0, operators_1.elementAt)(-1));
        }).to.throw(rxjs_1.ArgumentOutOfRangeError);
    });
    it('should raise error if index is out of range but does not have default 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.elementAt)(3))).toBe(expected, null, new rxjs_1.ArgumentOutOfRangeError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return default value if index is out of range', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--|   ');
            var e1subs = '  ^----!   ';
            var expected = '-----(x|)';
            var defaultValue = '42';
            expectObservable(e1.pipe((0, operators_1.elementAt)(3, defaultValue))).toBe(expected, { x: defaultValue });
            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.elementAt)(2)).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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