spec-js/operators/publishLast-spec.js

"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/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();
    });
    type('should infer the type', function () {
        /* tslint:disable:no-unused-variable */
        var source = Rx.Observable.of(1, 2, 3);
        var result = source.publishLast();
        /* tslint:enable:no-unused-variable */
    });
    type('should infer the type for the pipeable operator', function () {
        /* tslint:disable:no-unused-variable */
        var source = Rx.Observable.of(1, 2, 3);
        // TODO: https://github.com/ReactiveX/rxjs/issues/2972
        var result = Rx.operators.publishLast()(source);
        /* tslint:enable:no-unused-variable */
    });
});
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