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skipUntil-spec.ts
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skipUntil-spec.ts
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import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
import { Observable, of, Subject } from 'rxjs';
import { skipUntil, mergeMap } from 'rxjs/operators';
declare function asDiagram(arg: string): Function;
/** @test {skipUntil} */
describe('skipUntil', () => {
asDiagram('skipUntil')('should skip values until another observable notifies', () => {
const e1 = hot('--a--b--c--d--e----|');
const e1subs = '^ !';
const skip = hot('---------x------| ');
const skipSubs = '^ ! ';
const expected = ('-----------d--e----|');
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should emit elements after notifer emits', () => {
const e1 = hot('--a--b--c--d--e--|');
const e1subs = '^ !';
const skip = hot('---------x----| ');
const skipSubs = '^ ! ';
const expected = ('-----------d--e--|');
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should emit elements after a synchronous notifier emits', () => {
const values: string[] = [];
of('a', 'b').pipe(skipUntil(of('x'))).subscribe(
value => values.push(value),
err => { throw err; },
() => expect(values).to.deep.equal(['a', 'b'])
);
});
it('should raise an error if notifier throws and source is hot', () => {
const e1 = hot('--a--b--c--d--e--|');
const e1subs = '^ ! ';
const skip = hot('-------------# ');
const skipSubs = '^ ! ';
const expected = '-------------# ';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip all elements when notifier does not emit and completes early', () => {
const e1 = hot('--a--b--c--d--e--|');
const e1subs = '^ !';
const skip = hot('------------|');
const skipSubs = '^ !';
const expected = '-----------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should allow unsubscribing explicitly and early', () => {
const e1 = hot('--a--b--c--d--e----|');
const unsub = ' ! ';
const e1subs = '^ ! ';
const skip = hot('-------------x--| ');
const skipSubs = '^ ! ';
const expected = ('---------- ');
expectObservable(e1.pipe(skipUntil(skip)), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
const e1 = hot('--a--b--c--d--e----|');
const e1subs = '^ ! ';
const skip = hot('-------------x--| ');
const skipSubs = '^ ! ';
const expected = ('---------- ');
const unsub = ' ! ';
const result = e1.pipe(
mergeMap(x => of(x)),
skipUntil(skip),
mergeMap(x => of(x)),
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip all elements when notifier is empty', () => {
const e1 = hot('--a--b--c--d--e--|');
const e1subs = '^ !';
const skip = cold('|');
const skipSubs = '(^!)';
const expected = '-----------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should keep subscription to source, to wait for its eventual completion', () => {
const e1 = hot('------------------------------|');
const e1subs = '^ !';
const skip = hot('-------| ');
const skipSubs = '^ ! ';
const expected = '------------------------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should not complete if hot source observable does not complete', () => {
const e1 = hot('-');
const e1subs = '^';
const skip = hot('-------------x--|');
const skipSubs = '^ ! ';
const expected = '-';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should not complete if cold source observable never completes', () => {
const e1 = cold( '-');
const e1subs = '^';
const skip = hot('-------------x--|');
const skipSubs = '^ ! ';
const expected = '-';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should raise error if cold source is never and notifier errors', () => {
const e1 = cold( '-');
const e1subs = '^ !';
const skip = hot('-------------#');
const skipSubs = '^ !';
const expected = '-------------#';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip all elements and complete if notifier is cold never', () => {
const e1 = hot( '--a--b--c--d--e--|');
const e1subs = '^ !';
const skip = cold('-');
const skipSubs = '^ !';
const expected = '-----------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip all elements and complete if notifier is a hot never', () => {
const e1 = hot('--a--b--c--d--e--|');
const e1subs = '^ !';
const skip = hot('-');
const skipSubs = '^ !';
const expected = '-----------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip all elements and complete, even if notifier would not complete until later', () => {
const e1 = hot('^-a--b--c--d--e--|');
const e1subs = '^ !';
const skip = hot('^-----------------------|');
const skipSubs = '^ !';
const expected = '-----------------|';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should not complete if source does not complete if notifier completes without emission', () => {
const e1 = hot('-');
const e1subs = '^';
const skip = hot('--------------|');
const skipSubs = '^ !';
const expected = '-';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should not complete if source and notifier are both hot never', () => {
const e1 = hot('-');
const e1subs = '^';
const skip = hot('-');
const skipSubs = '^';
const expected = '-';
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(skip.subscriptions).toBe(skipSubs);
});
it('should skip skip all elements if notifier is unsubscribed explicitly before the notifier emits', () => {
const e1 = hot( '--a--b--c--d--e--|');
const e1subs = ['^ !',
'^ !']; // for the explicit subscribe some lines below
const skip = new Subject();
const expected = '-----------------|';
e1.subscribe((x: string) => {
if (x === 'd' && !skip.closed) {
skip.next('x');
}
skip.unsubscribe();
});
expectObservable(e1.pipe(skipUntil(skip))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should unsubscribe the notifier after its first nexted value', () => {
const source = hot('-^-o---o---o---o---o---o---|');
const notifier = hot('-^--------n--n--n--n--n--n-|');
const nSubs = '^ !';
const expected = '-^---------o---o---o---o---|';
const result = source.pipe(skipUntil(notifier));
expectObservable(result).toBe(expected);
expectSubscriptions(notifier.subscriptions).toBe(nSubs);
});
});