spec-js/operators/throttleTime-spec.js

"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
/** @test {throttleTime} */
describe('Observable.prototype.throttleTime', function () {
    asDiagram('throttleTime(50)')('should immediately emit the first value in each time window', function () {
        var e1 = hot('-a-x-y----b---x-cx---|');
        var subs = '^                    !';
        var expected = '-a--------b-----c----|';
        var result = e1.throttleTime(50, rxTestScheduler);
        expectObservable(result).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should throttle events by 50 time units', function (done) {
        Observable.of(1, 2, 3).throttleTime(50)
            .subscribe(function (x) {
            chai_1.expect(x).to.equal(1);
        }, null, done);
    });
    it('should throttle events multiple times', function () {
        var expected = ['1-0', '2-0'];
        Observable.concat(Observable.timer(0, 10, rxTestScheduler).take(3).map(function (x) { return '1-' + x; }), Observable.timer(80, 10, rxTestScheduler).take(5).map(function (x) { return '2-' + x; }))
            .throttleTime(50, rxTestScheduler)
            .subscribe(function (x) {
            chai_1.expect(x).to.equal(expected.shift());
        });
        rxTestScheduler.flush();
    });
    it('should simply mirror the source if values are not emitted often enough', function () {
        var e1 = hot('-a--------b-----c----|');
        var subs = '^                    !';
        var expected = '-a--------b-----c----|';
        expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should handle a busy producer emitting a regular repeating sequence', function () {
        var e1 = hot('abcdefabcdefabcdefabcdefa|');
        var subs = '^                        !';
        var expected = 'a-----a-----a-----a-----a|';
        expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should complete when source does not emit', function () {
        var e1 = hot('-----|');
        var subs = '^    !';
        var expected = '-----|';
        expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should raise error when source does not emit and raises error', function () {
        var e1 = hot('-----#');
        var subs = '^    !';
        var expected = '-----#';
        expectObservable(e1.throttleTime(10, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should handle an empty source', function () {
        var e1 = cold('|');
        var subs = '(^!)';
        var expected = '|';
        expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should handle a never source', function () {
        var e1 = cold('-');
        var subs = '^';
        var expected = '-';
        expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should handle a throw source', function () {
        var e1 = cold('#');
        var subs = '(^!)';
        var expected = '#';
        expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should throttle and does not complete when source does not completes', function () {
        var e1 = hot('-a--(bc)-------d----------------');
        var unsub = '                               !';
        var subs = '^                              !';
        var expected = '-a-------------d----------------';
        expectObservable(e1.throttleTime(50, rxTestScheduler), unsub).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
        var e1 = hot('-a--(bc)-------d----------------');
        var subs = '^                              !';
        var expected = '-a-------------d----------------';
        var unsub = '                               !';
        var result = e1
            .mergeMap(function (x) { return Observable.of(x); })
            .throttleTime(50, rxTestScheduler)
            .mergeMap(function (x) { return Observable.of(x); });
        expectObservable(result, unsub).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    it('should throttle values until source raises error', function () {
        var e1 = hot('-a--(bc)-------d---------------#');
        var subs = '^                              !';
        var expected = '-a-------------d---------------#';
        expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(subs);
    });
    describe('throttleTime(fn, { leading: true, trailing: true })', function () {
        asDiagram('throttleTime(fn, { leading: true, trailing: true })')('should immediately emit the first value in each time window', function () {
            var e1 = hot('-a-xy-----b--x--cxxx--|');
            var e1subs = '^                     !';
            var t = time('----|                 ');
            var expected = '-a---y----b---x-c---x-|';
            var result = e1.throttleTime(t, rxTestScheduler, { leading: true, trailing: true });
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    describe('throttleTime(fn, { leading: false, trailing: true })', function () {
        asDiagram('throttleTime(fn, { leading: false, trailing: true })')('should immediately emit the first value in each time window', function () {
            var e1 = hot('-a-xy-----b--x--cxxx--|');
            var e1subs = '^                     !';
            var t = time('----|                 ');
            var expected = '-----y--------x-----x-|';
            var result = e1.throttleTime(t, rxTestScheduler, { leading: false, trailing: true });
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
});
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