spec-js/operators/publishLast-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {publishLast} */
describe('Observable.prototype.publishLast', function () {
asDiagram('publishLast')('should emit last notification of a simple source Observable', function () {
var source = cold('--1-2---3-4--5-|');
var sourceSubs = '^ !';
var published = source.publishLast();
var expected = '---------------(5|)';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should return a ConnectableObservable-ish', function () {
var source = Observable.of(1).publishLast();
chai_1.expect(typeof source._subscribe === 'function').to.be.true;
chai_1.expect(typeof source.getSubject === 'function').to.be.true;
chai_1.expect(typeof source.connect === 'function').to.be.true;
chai_1.expect(typeof source.refCount === 'function').to.be.true;
});
it('should do nothing if connect is not called, despite subscriptions', function () {
var source = cold('--1-2---3-4--5-|');
var sourceSubs = [];
var published = source.publishLast();
var expected = '-';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast the same values to multiple observers', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ !';
var published = source.publishLast();
var subscriber1 = hot('a| ').mergeMapTo(published);
var expected1 = '------------(4|)';
var subscriber2 = hot(' b| ').mergeMapTo(published);
var expected2 = ' --------(4|)';
var subscriber3 = hot(' c| ').mergeMapTo(published);
var expected3 = ' ----(4|)';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should multicast an error from the source to multiple observers', function () {
var source = cold('-1-2-3----4-#');
var sourceSubs = '^ !';
var published = source.publishLast();
var subscriber1 = hot('a| ').mergeMapTo(published);
var expected1 = '------------#';
var subscriber2 = hot(' b| ').mergeMapTo(published);
var expected2 = ' --------#';
var subscriber3 = hot(' c| ').mergeMapTo(published);
var expected3 = ' ----#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should not cast any values to multiple observers, ' +
'when source is unsubscribed explicitly and early', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ ! ';
var published = source.publishLast();
var unsub = ' u ';
var subscriber1 = hot('a| ').mergeMapTo(published);
var expected1 = '---------- ';
var subscriber2 = hot(' b| ').mergeMapTo(published);
var expected2 = ' ------ ';
var subscriber3 = hot(' c| ').mergeMapTo(published);
var expected3 = ' -- ';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
// Set up unsubscription action
var connection;
expectObservable(hot(unsub).do(function () {
connection.unsubscribe();
})).toBe(unsub);
connection = published.connect();
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ ! ';
var published = source
.mergeMap(function (x) { return Observable.of(x); })
.publishLast();
var subscriber1 = hot('a| ').mergeMapTo(published);
var expected1 = '---------- ';
var subscriber2 = hot(' b| ').mergeMapTo(published);
var expected2 = ' ------ ';
var subscriber3 = hot(' c| ').mergeMapTo(published);
var expected3 = ' -- ';
var unsub = ' u ';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
// Set up unsubscription action
var connection;
expectObservable(hot(unsub).do(function () {
connection.unsubscribe();
})).toBe(unsub);
connection = published.connect();
});
describe('with refCount()', function () {
it('should connect when first subscriber subscribes', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ' ^ !';
var replayed = source.publishLast().refCount();
var subscriber1 = hot(' a| ').mergeMapTo(replayed);
var expected1 = ' ------------(4|)';
var subscriber2 = hot(' b| ').mergeMapTo(replayed);
var expected2 = ' --------(4|)';
var subscriber3 = hot(' c| ').mergeMapTo(replayed);
var expected3 = ' ----(4|)';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should disconnect when last subscriber unsubscribes', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ' ^ ! ';
var replayed = source.publishLast().refCount();
var subscriber1 = hot(' a| ').mergeMapTo(replayed);
var unsub1 = ' ! ';
var expected1 = ' -------- ';
var subscriber2 = hot(' b| ').mergeMapTo(replayed);
var unsub2 = ' ! ';
var expected2 = ' ------ ';
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should NOT be retryable', function () {
var source = cold('-1-2-3----4-#');
var sourceSubs = '^ !';
var published = source.publishLast().refCount().retry(3);
var subscriber1 = hot('a| ').mergeMapTo(published);
var expected1 = '------------#';
var subscriber2 = hot(' b| ').mergeMapTo(published);
var expected2 = ' --------#';
var subscriber3 = hot(' c| ').mergeMapTo(published);
var expected3 = ' ----#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
});
it('should multicast an empty source', function () {
var source = cold('|');
var sourceSubs = '(^!)';
var published = source.publishLast();
var expected = '|';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should multicast a never source', function () {
var source = cold('-');
var sourceSubs = '^';
var published = source.publishLast();
var expected = '-';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should multicast a throw source', function () {
var source = cold('#');
var sourceSubs = '(^!)';
var published = source.publishLast();
var expected = '#';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
published.connect();
});
it('should multicast one observable to multiple observers', function (done) {
var results1 = [];
var results2 = [];
var subscriptions = 0;
var source = new Observable(function (observer) {
subscriptions++;
observer.next(1);
observer.next(2);
observer.next(3);
observer.next(4);
observer.complete();
});
var connectable = source.publishLast();
connectable.subscribe(function (x) {
results1.push(x);
});
connectable.subscribe(function (x) {
results2.push(x);
});
chai_1.expect(results1).to.deep.equal([]);
chai_1.expect(results2).to.deep.equal([]);
connectable.connect();
chai_1.expect(results1).to.deep.equal([4]);
chai_1.expect(results2).to.deep.equal([4]);
chai_1.expect(subscriptions).to.equal(1);
done();
});
});
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