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concat-spec.ts
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import { expect } from 'chai';
import { of, Observable } from 'rxjs';
import { concat, mergeMap } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
declare function asDiagram(arg: string): Function;
declare const rxTestScheduler: TestScheduler;
/** @test {concat} */
describe('concat operator', () => {
asDiagram('concat')('should concatenate two cold observables', () => {
const e1 = cold('--a--b-|');
const e2 = cold( '--x---y--|');
const expected = '--a--b---x---y--|';
expectObservable(e1.pipe(concat(e2, rxTestScheduler))).toBe(expected);
});
it('should work properly with scalar observables', (done) => {
const results: string[] = [];
const s1 = new Observable<number>((observer) => {
setTimeout(() => {
observer.next(1);
observer.complete();
});
})
.pipe(concat(of(2)));
s1.subscribe((x) => {
results.push('Next: ' + x);
}, (x) => {
done(new Error('should not be called'));
}, () => {
results.push('Completed');
expect(results).to.deep.equal(['Next: 1', 'Next: 2', 'Completed']);
done();
}
);
});
it('should complete without emit if both sources are empty', () => {
const e1 = cold('--|');
const e1subs = '^ !';
const e2 = cold( '----|');
const e2subs = ' ^ !';
const expected = '------|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if first source does not completes', () => {
const e1 = cold('-');
const e1subs = '^';
const e2 = cold('--|');
const e2subs: string[] = [];
const expected = '-';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if second source does not completes', () => {
const e1 = cold('--|');
const e1subs = '^ !';
const e2 = cold('---');
const e2subs = ' ^';
const expected = '---';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if both sources do not complete', () => {
const e1 = cold('-');
const e1subs = '^';
const e2 = cold('-');
const e2subs: string[] = [];
const expected = '-';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error when first source is empty, second source raises error', () => {
const e1 = cold('--|');
const e1subs = '^ !';
const e2 = cold( '----#');
const e2subs = ' ^ !';
const expected = '------#';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error when first source raises error, second source is empty', () => {
const e1 = cold('---#');
const e1subs = '^ !';
const e2 = cold('----|');
const e2subs: string[] = [];
const expected = '---#';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise first error when both source raise error', () => {
const e1 = cold('---#');
const e1subs = '^ !';
const e2 = cold('------#');
const e2subs: string[] = [];
const expected = '---#';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should concat if first source emits once, second source is empty', () => {
const e1 = cold('--a--|');
const e1subs = '^ !';
const e2 = cold( '--------|');
const e2subs = ' ^ !';
const expected = '--a----------|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should concat if first source is empty, second source emits once', () => {
const e1 = cold('--|');
const e1subs = '^ !';
const e2 = cold( '--a--|');
const e2subs = ' ^ !';
const expected = '----a--|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit element from first source, and should not complete if second ' +
'source does not completes', () => {
const e1 = cold('--a--|');
const e1subs = '^ !';
const e2 = cold( '-');
const e2subs = ' ^';
const expected = '--a---';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not complete if first source does not complete', () => {
const e1 = cold('-');
const e1subs = '^';
const e2 = cold('--a--|');
const e2subs: string[] = [];
const expected = '-';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit elements from each source when source emit once', () => {
const e1 = cold('---a|');
const e1subs = '^ !';
const e2 = cold( '-----b--|');
const e2subs = ' ^ !';
const expected = '---a-----b--|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should unsubscribe to inner source if outer is unsubscribed early', () => {
const e1 = cold('---a-a--a| ');
const e1subs = '^ ! ';
const e2 = cold( '-----b-b--b-|');
const e2subs = ' ^ ! ';
const unsub = ' ! ';
const expected = '---a-a--a-----b-b ';
expectObservable(e1.pipe(concat(e2)), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
const e1 = cold('---a-a--a| ');
const e1subs = '^ ! ';
const e2 = cold( '-----b-b--b-|');
const e2subs = ' ^ ! ';
const expected = '---a-a--a-----b-b- ';
const unsub = ' ! ';
const result = e1.pipe(
mergeMap((x) => of(x)),
concat(e2),
mergeMap((x) => of(x))
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should raise error from first source and does not emit from second source', () => {
const e1 = cold('--#');
const e1subs = '^ !';
const e2 = cold('----a--|');
const e2subs: string[] = [];
const expected = '--#';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit element from first source then raise error from second source', () => {
const e1 = cold('--a--|');
const e1subs = '^ !';
const e2 = cold( '-------#');
const e2subs = ' ^ !';
const expected = '--a---------#';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit all elements from both hot observable sources if first source ' +
'completes before second source starts emit', () => {
const e1 = hot('--a--b-|');
const e1subs = '^ !';
const e2 = hot('--------x--y--|');
const e2subs = ' ^ !';
const expected = '--a--b--x--y--|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should emit elements from second source regardless of completion time ' +
'when second source is cold observable', () => {
const e1 = hot('--a--b--c---|');
const e1subs = '^ !';
const e2 = cold('-x-y-z-|');
const e2subs = ' ^ !';
const expected = '--a--b--c----x-y-z-|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should not emit collapsing element from second source', () => {
const e1 = hot('--a--b--c--|');
const e1subs = '^ !';
const e2 = hot('--------x--y--z--|');
const e2subs = ' ^ !';
const expected = '--a--b--c--y--z--|';
expectObservable(e1.pipe(concat(e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should accept scheduler with multiple observables', () => {
const e1 = cold('---a|');
const e1subs = '^ !';
const e2 = cold( '---b--|');
const e2subs = ' ^ !';
const e3 = cold( '---c--|');
const e3subs = ' ^ !';
const expected = '---a---b-----c--|';
expectObservable(e1.pipe(concat(e2, e3, rxTestScheduler))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should accept scheduler without observable parameters', () => {
const e1 = cold('---a-|');
const e1subs = '^ !';
const expected = '---a-|';
expectObservable(e1.pipe(concat(rxTestScheduler))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit self without parameters', () => {
const e1 = cold('---a-|');
const e1subs = '^ !';
const expected = '---a-|';
expectObservable(e1.pipe(concat())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});