spec-js/operators/sample-spec.js
"use strict";
var Rx = require('../../dist/cjs/Rx');
var chai_1 = require('chai');
var Observable = Rx.Observable;
/** @test {sample} */
describe('Observable.prototype.sample', function () {
asDiagram('sample')('should get samples when the notifier emits', function () {
var e1 = hot('---a----b---c----------d-----| ');
var e1subs = '^ ! ';
var e2 = hot('-----x----------x---x------x---|');
var e2subs = '^ ! ';
var expected = '-----a----------c----------d-| ';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should sample nothing if source has not nexted at all', function () {
var e1 = hot('----a-^------------|');
var e1subs = '^ !';
var e2 = hot('-----x-------|');
var e2subs = '^ !';
var expected = '-------------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should behave properly when notified by the same observable as the source (issue #2075)', function () {
var item$ = new Rx.Subject();
var results = [];
item$
.sample(item$)
.subscribe(function (value) { return results.push(value); });
item$.next(1);
item$.next(2);
item$.next(3);
chai_1.expect(results).to.deep.equal([1, 2, 3]);
});
it('should sample nothing if source has nexted after all notifications, but notifier does not complete', function () {
var e1 = hot('----a-^------b-----|');
var e1subs = '^ !';
var e2 = hot('-----x--------');
var e2subs = '^ !';
var expected = '-------------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should sample when the notifier completes', function () {
var e1 = hot('----a-^------b----------|');
var e1subs = '^ !';
var e2 = hot('-----x-----|');
var e2subs = '^ !';
var expected = '-----------b------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete when the notifier completes, nor should it emit', function () {
var e1 = hot('----a----b----c----d----e----f----');
var e1subs = '^ ';
var e2 = hot('------x-| ');
var e2subs = '^ ! ';
var expected = '------a---------------------------';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should complete only when the source completes, if notifier completes early', function () {
var e1 = hot('----a----b----c----d----e----f---|');
var e1subs = '^ !';
var e2 = hot('------x-| ');
var e2subs = '^ ! ';
var expected = '------a--------------------------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('----a-^--b----c----d----e----f----| ');
var unsub = ' ! ';
var e1subs = '^ ! ';
var e2 = hot('-----x----------x----------x----------|');
var e2subs = '^ ! ';
var expected = '-----b--------- ';
expectObservable(e1.sample(e2), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('----a-^--b----c----d----e----f----| ');
var e1subs = '^ ! ';
var e2 = hot('-----x----------x----------x----------|');
var e2subs = '^ ! ';
var expected = '-----b--------- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.sample(e2)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should only sample when a new value arrives, even if it is the same value', function () {
var e1 = hot('----a----b----c----c----e----f----| ');
var e1subs = '^ ! ';
var e2 = hot('------x-x------xx-x---x----x--------|');
var e2subs = '^ ! ';
var expected = '------a--------c------c----e------| ';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error if source raises error', function () {
var e1 = hot('----a-^--b----c----d----# ');
var e1subs = '^ ! ';
var e2 = hot('-----x----------x----------x----------|');
var e2subs = '^ ! ';
var expected = '-----b----------d-# ';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should completes if source does not emits', function () {
var e1 = hot('|');
var e2 = hot('------x-------|');
var expected = '|';
var e1subs = '(^!)';
var e2subs = '(^!)';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error if source throws immediately', function () {
var e1 = hot('#');
var e2 = hot('------x-------|');
var expected = '#';
var e1subs = '(^!)';
var e2subs = '(^!)';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error if notification raises error', function () {
var e1 = hot('--a-----|');
var e2 = hot('----#');
var expected = '----#';
var e1subs = '^ !';
var e2subs = '^ !';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not completes if source does not complete', function () {
var e1 = hot('-');
var e1subs = '^ ';
var e2 = hot('------x-------|');
var e2subs = '^ !';
var expected = '-';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should sample only until source completes', function () {
var e1 = hot('----a----b----c----d-|');
var e1subs = '^ !';
var e2 = hot('-----------x----------x------------|');
var e2subs = '^ !';
var expected = '-----------b---------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should complete sampling if sample observable completes', function () {
var e1 = hot('----a----b----c----d-|');
var e1subs = '^ !';
var e2 = hot('|');
var e2subs = '(^!)';
var expected = '---------------------|';
expectObservable(e1.sample(e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
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