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shareReplay-spec.ts
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shareReplay-spec.ts
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import { expect } from 'chai';
import * as sinon from 'sinon';
import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
import { shareReplay, mergeMapTo, retry } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import { Observable, Operator, Observer, of } from 'rxjs';
declare function asDiagram(arg: string): Function;
declare const rxTestScheduler: TestScheduler;
/** @test {shareReplay} */
describe('shareReplay operator', () => {
it('should mirror a simple source Observable', () => {
const source = cold('--1-2---3-4--5-|');
const sourceSubs = '^ !';
const published = source.pipe(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.pipe(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.pipe(shareReplay(1));
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-3----4-|';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' 23----4-|';
const subscriber3 = hot(' c| ').pipe(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.pipe(shareReplay(2));
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-----3------4-|';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' (12)-3------4-|';
const subscriber3 = hot(' c| ').pipe(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.pipe(shareReplay(1));
const sourceSubs = '^ !';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-3----4-#';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' 23----4-#';
const subscriber3 = hot(' c| ').pipe(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.pipe(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.pipe(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.pipe(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.pipe(shareReplay(2));
const sourceSubs = '^ ! ';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-----3-| ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' (12)-3-| ';
const subscriber3 = hot(' (c|) ').pipe(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.pipe(shareReplay(2));
const sourceSubs1 = '^ ! ';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-----3-# ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' (12)-3-# ';
const subscriber3 = hot(' (c|) ').pipe(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.pipe(shareReplay(2), retry(1));
subs.push( '^ ! ');
subs.push( ' ^ ! ');
subs.push( ' ^ !');
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-----3--1-2-----3-# ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' (12)-3--1-2-----3-# ';
const subscriber3 = hot(' (c|) ').pipe(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);
});
it('when no windowTime is given ReplaySubject should be in _infiniteTimeWindow mode', () => {
const spy = sinon.spy(rxTestScheduler, 'now');
of(1)
.pipe(shareReplay(1, undefined, rxTestScheduler))
.subscribe();
spy.restore();
expect(spy, 'ReplaySubject should not call scheduler.now() when no windowTime is given').to.be.not.called;
});
it('should not restart due to unsubscriptions if refCount is false', () => {
const source = cold('a-b-c-d-e-f-g-h-i-j');
const sourceSubs = '^------------------';
const sub1 = '^------!';
const expected1 = 'a-b-c-d-';
const sub2 = '-----------^-------';
const expected2 = '-----------fg-h-i-j';
const shared = source.pipe(shareReplay({ bufferSize: 1, refCount: false }));
expectObservable(shared, sub1).toBe(expected1);
expectObservable(shared, sub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should restart due to unsubscriptions if refCount is true', () => {
const sourceSubs = [];
const source = cold('a-b-c-d-e-f-g-h-i-j');
sourceSubs.push( '^------!----------------------');
sourceSubs.push( '-----------^------------------');
const sub1 = '^------!';
const expected1 = 'a-b-c-d-';
const sub2 = '-----------^------------------';
const expected2 = '-----------a-b-c-d-e-f-g-h-i-j';
const shared = source.pipe(shareReplay({ bufferSize: 1, refCount: true }));
expectObservable(shared, sub1).toBe(expected1);
expectObservable(shared, sub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should not restart due to unsubscriptions if refCount is true when the source has completed', () => {
const source = cold('a-(b|) ');
const sourceSubs = '^-! ';
const sub1 = '^------! ';
const expected1 = 'a-(b|) ';
const sub2 = '-----------^! ';
const expected2 = '-----------(b|)';
const shared = source.pipe(shareReplay({ bufferSize: 1, refCount: true }));
expectObservable(shared, sub1).toBe(expected1);
expectObservable(shared, sub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should default to refCount being false', () => {
const source = cold('a-b-c-d-e-f-g-h-i-j');
const sourceSubs = '^------------------';
const sub1 = '^------!';
const expected1 = 'a-b-c-d-';
const sub2 = '-----------^-------';
const expected2 = '-----------fg-h-i-j';
const shared = source.pipe(shareReplay(1));
expectObservable(shared, sub1).toBe(expected1);
expectObservable(shared, sub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should not break lift() composability', (done: MochaDone) => {
class MyCustomObservable<T> extends Observable<T> {
lift<R>(operator: Operator<T, R>): Observable<R> {
const observable = new MyCustomObservable<R>();
(<any>observable).source = this;
(<any>observable).operator = operator;
return observable;
}
}
const result = new MyCustomObservable((observer: Observer<number>) => {
observer.next(1);
observer.next(2);
observer.next(3);
observer.complete();
}).pipe(shareReplay());
expect(result instanceof MyCustomObservable).to.be.true;
const expected = [1, 2, 3];
result
.subscribe((n: any) => {
expect(expected.length).to.be.greaterThan(0);
expect(n).to.equal(expected.shift());
}, (x) => {
done(new Error('should not be called'));
}, () => {
done();
});
});
});