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share-spec.ts
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share-spec.ts
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import { expect } from 'chai';
import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
import { share, retry, mergeMapTo, mergeMap, tap, repeat } from 'rxjs/operators';
import { Observable, EMPTY, NEVER, of } from 'rxjs';
/** @test {share} */
describe('share operator', () => {
it('should mirror a simple source Observable', () => {
const source = cold('--1-2---3-4--5-|');
const sourceSubs = '^ !';
const expected = '--1-2---3-4--5-|';
const shared = source.pipe(share());
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share a single subscription', () => {
let subscriptionCount = 0;
const obs = new Observable<never>(observer => {
subscriptionCount++;
});
const source = obs.pipe(share());
expect(subscriptionCount).to.equal(0);
source.subscribe();
source.subscribe();
expect(subscriptionCount).to.equal(1);
});
it('should not change the output of the observable when error', () => {
const e1 = hot('---a--^--b--c--d--e--#');
const e1subs = '^ !';
const expected = '---b--c--d--e--#';
expectObservable(e1.pipe(share())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not change the output of the observable when successful with cold observable', () => {
const e1 = cold('---a--b--c--d--e--|');
const e1subs = '^ !';
const expected = '---a--b--c--d--e--|';
expectObservable(e1.pipe(share())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not change the output of the observable when error with cold observable', () => {
const e1 = cold('---a--b--c--d--e--#');
const e1subs = '^ !';
const expected = '---a--b--c--d--e--#';
expectObservable(e1.pipe(share())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should retry just fine', () => {
const e1 = cold('---a--b--c--d--e--#');
const e1subs = ['^ ! ',
' ^ !'];
const expected = '---a--b--c--d--e-----a--b--c--d--e--#';
expectObservable(e1.pipe(share(), retry(1))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should share the same values to multiple observers', () => {
const source = cold('-1-2-3----4-|');
const sourceSubs = '^ !';
const shared = source.pipe(share());
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-3----4-|';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' -3----4-|';
const subscriber3 = hot(' c| ').pipe(mergeMapTo(shared));
const expected3 = ' --4-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share an error from the source to multiple observers', () => {
const source = cold('-1-2-3----4-#');
const sourceSubs = '^ !';
const shared = source.pipe(share());
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-3----4-#';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' -3----4-#';
const subscriber3 = hot(' c| ').pipe(mergeMapTo(shared));
const expected3 = ' --4-#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share the same values to multiple observers, ' +
'but is unsubscribed explicitly and early', () => {
const source = cold('-1-2-3----4-|');
const sourceSubs = '^ ! ';
const shared = source.pipe(share());
const unsub = ' ! ';
const subscriber1 = hot('a| ').pipe(mergeMapTo(shared));
const expected1 = '-1-2-3---- ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' -3---- ';
const subscriber3 = hot(' c| ').pipe(mergeMapTo(shared));
const expected3 = ' -- ';
expectObservable(subscriber1, unsub).toBe(expected1);
expectObservable(subscriber2, unsub).toBe(expected2);
expectObservable(subscriber3, unsub).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share an empty source', () => {
const source = cold('|');
const sourceSubs = '(^!)';
const shared = source.pipe(share());
const expected = '|';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share a never source', () => {
const source = cold('-');
const sourceSubs = '^';
const shared = source.pipe(share());
const expected = '-';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should share a throw source', () => {
const source = cold('#');
const sourceSubs = '(^!)';
const shared = source.pipe(share());
const expected = '#';
expectObservable(shared).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should connect when first subscriber subscribes', () => {
const source = cold( '-1-2-3----4-|');
const sourceSubs = ' ^ !';
const shared = source.pipe(share());
const subscriber1 = hot(' a| ').pipe(mergeMapTo(shared));
const expected1 = ' -1-2-3----4-|';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const expected2 = ' -3----4-|';
const subscriber3 = hot(' c| ').pipe(mergeMapTo(shared));
const 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', () => {
const source = cold( '-1-2-3----4-|');
const sourceSubs = ' ^ ! ';
const shared = source.pipe(share());
const subscriber1 = hot(' a| ').pipe(mergeMapTo(shared));
const unsub1 = ' ! ';
const expected1 = ' -1-2-3-- ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const unsub2 = ' ! ';
const expected2 = ' -3---- ';
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should not break unsubscription chain when last subscriber unsubscribes', () => {
const source = cold( '-1-2-3----4-|');
const sourceSubs = ' ^ ! ';
const shared = source.pipe(
mergeMap((x: string) => of(x)),
share(),
mergeMap((x: string) => of(x))
);
const subscriber1 = hot(' a| ').pipe(mergeMapTo(shared));
const unsub1 = ' ! ';
const expected1 = ' -1-2-3-- ';
const subscriber2 = hot(' b| ').pipe(mergeMapTo(shared));
const unsub2 = ' ! ';
const expected2 = ' -3---- ';
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable when cold source is synchronous', () => {
const source = cold('(123#)');
const shared = source.pipe(share());
const subscribe1 = 's ';
const expected1 = '(123123#) ';
const subscribe2 = ' s ';
const expected2 = ' (123123#)';
const sourceSubs = ['(^!)',
'(^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).pipe(tap(() => {
expectObservable(shared.pipe(retry(1))).toBe(expected1);
}))).toBe(subscribe1);
expectObservable(hot(subscribe2).pipe(tap(() => {
expectObservable(shared.pipe(retry(1))).toBe(expected2);
}))).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable when cold source is synchronous', () => {
const source = cold('(123|)');
const shared = source.pipe(share());
const subscribe1 = 's ';
const expected1 = '(123123|) ';
const subscribe2 = ' s ';
const expected2 = ' (123123|)';
const sourceSubs = ['(^!)',
'(^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).pipe(tap(() => {
expectObservable(shared.pipe(repeat(2))).toBe(expected1);
}))).toBe(subscribe1);
expectObservable(hot(subscribe2).pipe(tap(() => {
expectObservable(shared.pipe(repeat(2))).toBe(expected2);
}))).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable', () => {
const source = cold('-1-2-3----4-# ');
const sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
const shared = source.pipe(share());
const subscribe1 = 's ';
const expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-#';
const subscribe2 = ' s ';
const expected2 = ' -3----4--1-2-3----4--1-2-3----4-#';
expectObservable(hot(subscribe1).pipe(tap(() => {
expectObservable(shared.pipe(retry(2))).toBe(expected1);
}))).toBe(subscribe1);
expectObservable(hot(subscribe2).pipe(tap(() => {
expectObservable(shared.pipe(retry(2))).toBe(expected2);
}))).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable', () => {
const source = cold('-1-2-3----4-| ');
const sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
const shared = source.pipe(share());
const subscribe1 = 's ';
const expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-|';
const subscribe2 = ' s ';
const expected2 = ' -3----4--1-2-3----4--1-2-3----4-|';
expectObservable(hot(subscribe1).pipe(tap(() => {
expectObservable(shared.pipe(repeat(3))).toBe(expected1);
}))).toBe(subscribe1);
expectObservable(hot(subscribe2).pipe(tap(() => {
expectObservable(shared.pipe(repeat(3))).toBe(expected2);
}))).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should not change the output of the observable when never', () => {
const e1 = NEVER;
const expected = '-';
expectObservable(e1.pipe(share())).toBe(expected);
});
it('should not change the output of the observable when empty', () => {
const e1 = EMPTY;
const expected = '|';
expectObservable(e1.pipe(share())).toBe(expected);
});
});