forked from ReactiveX/rxjs
/
debounceTime-spec.ts
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/
debounceTime-spec.ts
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/** @prettier */
import { expect } from 'chai';
import { NEVER, of, Subject } from 'rxjs';
import { AnimationFrameAction } from 'rxjs/internal/scheduler/AnimationFrameAction';
import { AnimationFrameScheduler } from 'rxjs/internal/scheduler/AnimationFrameScheduler';
import { debounceTime, mergeMap, startWith } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import { VirtualTimeScheduler } from '../../src/internal/scheduler/VirtualTimeScheduler';
import { observableMatcher } from '../helpers/observableMatcher';
/** @test {debounceTime} */
describe('debounceTime', () => {
let testScheduler: TestScheduler;
beforeEach(() => {
testScheduler = new TestScheduler(observableMatcher);
});
it('should debounce values by 2 time units', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -a--bc--d---|');
const e1subs = ' ^-----------!';
const expected = '---a---c--d-|';
const t = time(' --|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay all elements by the specified time', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -a--------b------c----|');
const e1subs = ' ^---------------------!';
const expected = '------a--------b------(c|)';
const t = time(' -----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should debounce and delay element by the specified time', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -a--(bc)-----------d-------|');
const e1subs = ' ^--------------------------!';
const expected = '---------c--------------d--|';
const t = time(' -----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should complete when source does not emit', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -----|');
const e1subs = ' ^----!';
const expected = '-----|';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should complete when source is empty', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' |');
const e1subs = ' (^!)';
const expected = '|';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raise error when source does not emit and raises error', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -----#');
const e1subs = ' ^----!';
const expected = '-----#';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raise error when source throws', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' #');
const e1subs = ' (^!)';
const expected = '#';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should allow unsubscribing early and explicitly', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--bc--d----|');
const e1subs = ' ^------! ';
const expected = '----a--- ';
const unsub = ' -------! ';
const t = time(' --|');
const result = e1.pipe(debounceTime(t));
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not break unsubscription chains when unsubscribed explicitly', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--bc--d----|');
const e1subs = ' ^------! ';
const expected = '----a--- ';
const unsub = ' -------! ';
const t = time(' --|');
const result = e1.pipe(
mergeMap((x: any) => of(x)),
debounceTime(t),
mergeMap((x: any) => of(x))
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should debounce and does not complete when source does not completes', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -a--(bc)-----------d-------');
const e1subs = ' ^--------------------------';
const expected = '---------c--------------d--';
const t = time(' -----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not completes when source does not completes', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -');
const e1subs = ' ^';
const expected = '-';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not completes when source never completes', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' -');
const e1subs = ' ^';
const expected = '-';
const t = time(' -|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay all elements until source raises error', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -a--------b------c----#');
const e1subs = ' ^---------------------!';
const expected = '------a--------b------#';
const t = time(' -----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should debounce all elements while source emits within given time', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--c--d--e--f--g--h-|');
const e1subs = ' ^------------------------!';
const expected = '-------------------------(h|)';
const t = time(' ----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should debounce all element while source emits within given time until raises error', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--c--d--e--f--g--h-#');
const e1subs = ' ^------------------------!';
const expected = '-------------------------#';
const t = time(' ----|');
expectObservable(e1.pipe(debounceTime(t))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should debounce correctly when synchronously reentered', () => {
const results: number[] = [];
const source = new Subject<number>();
const scheduler = new VirtualTimeScheduler();
source.pipe(debounceTime(0, scheduler)).subscribe((value) => {
results.push(value);
if (value === 1) {
source.next(2);
}
});
source.next(1);
scheduler.flush();
expect(results).to.deep.equal([1, 2]);
});
it('should unsubscribe from the scheduled debounce action when downstream unsubscribes', () => {
const scheduler = new AnimationFrameScheduler(AnimationFrameAction);
expect(scheduler._scheduled).to.not.exist;
expect(scheduler.actions).to.be.empty;
const subscription = NEVER.pipe(startWith(1), debounceTime(0, scheduler)).subscribe();
expect(scheduler._scheduled).to.exist;
expect(scheduler.actions.length).to.equal(1);
subscription.unsubscribe();
expect(scheduler._scheduled).to.not.exist;
expect(scheduler.actions).to.be.empty;
});
});