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shareReplay-spec.ts
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shareReplay-spec.ts
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import {expect} from 'chai';
import * as Rx from '../../dist/cjs/Rx';
import marbleTestingSignature = require('../helpers/marble-testing'); // tslint:disable-line:no-require-imports
declare const { asDiagram };
declare const hot: typeof marbleTestingSignature.hot;
declare const cold: typeof marbleTestingSignature.cold;
declare const expectObservable: typeof marbleTestingSignature.expectObservable;
declare const expectSubscriptions: typeof marbleTestingSignature.expectSubscriptions;
const Observable = Rx.Observable;
/** @test {shareReplay} */
describe('Observable.prototype.shareReplay', () => {
it('should mirror a simple source Observable', () => {
const source = cold('--1-2---3-4--5-|');
const sourceSubs = '^ !';
const published = source.shareReplay();
const expected = '--1-2---3-4--5-|';
expectObservable(published).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should do nothing if result is not subscribed', () => {
let subscribed = false;
const source = new Observable(() => {
subscribed = true;
});
source.shareReplay();
expect(subscribed).to.be.false;
});
it('should multicast the same values to multiple observers, bufferSize=1', () => {
const source = cold('-1-2-3----4-|'); const shared = source.shareReplay(1);
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-3----4-|';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' 23----4-|';
const subscriber3 = hot(' c| ').mergeMapTo(shared);
const expected3 = ' 3-4-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast the same values to multiple observers, bufferSize=2', () => {
const source = cold('-1-2-----3------4-|'); const shared = source.shareReplay(2);
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-----3------4-|';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' (12)-3------4-|';
const subscriber3 = hot(' c| ').mergeMapTo(shared);
const expected3 = ' (23)-4-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast an error from the source to multiple observers', () => {
const source = cold('-1-2-3----4-#'); const shared = source.shareReplay(1);
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-3----4-#';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' 23----4-#';
const subscriber3 = hot(' c| ').mergeMapTo(shared);
const expected3 = ' 3-4-#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast an empty source', () => {
const source = cold('|');
const sourceSubs = '(^!)';
const shared = source.shareReplay(1);
const expected = '|';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast a never source', () => {
const source = cold('-');
const sourceSubs = '^';
const shared = source.shareReplay(1);
const expected = '-';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast a throw source', () => {
const source = cold('#');
const sourceSubs = '(^!)';
const shared = source.shareReplay(1);
const expected = '#';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should replay results to subsequent subscriptions if source completes, bufferSize=2', () => {
const source = cold('-1-2-----3-| ');
const shared = source.shareReplay(2);
const sourceSubs = '^ ! ';
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-----3-| ';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' (12)-3-| ';
const subscriber3 = hot(' (c|) ').mergeMapTo(shared);
const expected3 = ' (23|)';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should completely restart for subsequent subscriptions if source errors, bufferSize=2', () => {
const source = cold('-1-2-----3-# ');
const shared = source.shareReplay(2);
const sourceSubs1 = '^ ! ';
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-----3-# ';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' (12)-3-# ';
const subscriber3 = hot(' (c|) ').mergeMapTo(shared);
const expected3 = ' -1-2-----3-#';
const sourceSubs2 = ' ^ !';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe([sourceSubs1, sourceSubs2]);
});
it('should be retryable, bufferSize=2', () => {
const subs = [];
const source = cold('-1-2-----3-# ');
const shared = source.shareReplay(2).retry(1);
subs.push( '^ ! ');
subs.push( ' ^ ! ');
subs.push( ' ^ !');
const subscriber1 = hot('a| ').mergeMapTo(shared);
const expected1 = '-1-2-----3--1-2-----3-# ';
const subscriber2 = hot(' b| ').mergeMapTo(shared);
const expected2 = ' (12)-3--1-2-----3-# ';
const subscriber3 = hot(' (c|) ').mergeMapTo(shared);
const expected3 = ' (12)-3--1-2-----3-#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(subs);
});
});