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delay-spec.ts
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delay-spec.ts
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/** @prettier */
import { of, concat } from 'rxjs';
import { delay, repeatWhen, skip, take, tap, mergeMap, ignoreElements } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import * as sinon from 'sinon';
import { expect } from 'chai';
import { observableMatcher } from '../helpers/observableMatcher';
/** @test {delay} */
describe('delay', () => {
let testScheduler: TestScheduler;
beforeEach(() => {
testScheduler = new TestScheduler(observableMatcher);
});
it('should delay by specified timeframe', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a--b--|');
const e1subs = ' ^--------!';
const t = time(' --| ');
// --|
const expected = '-----a--b|';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not delay at all if the delay number is negative', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a--b--|');
const e1subs = ' ^--------!';
const t = -1;
const expected = '---a--b--|';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay by absolute time period', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a---a----a----a------------b---b---b---b--|');
const e1subs = ' ^----------------------------------------------!';
const t = time(' --------------------| ');
const expected = '--------------------(aaaaa)-----b---b---b---b--|';
const absoluteDelay = new Date(testScheduler.now() + t);
const result = e1.pipe(delay(absoluteDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not delay at all if the absolute time is in the past', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a---a----a----a------------b---b---b---b--|');
const e1subs = ' ^----------------------------------------------!';
const t = -10000;
const expected = '--a--a---a----a----a------------b---b---b---b--|';
const absoluteDelay = new Date(testScheduler.now() + t);
const result = e1.pipe(delay(absoluteDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay by absolute time period after source ends', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot('---^--a-----a---a-----a---| ');
const e1subs = ' ^----------------------! ';
const t = time(' ------------------------------| ');
const expected = ' ------------------------------(aaaa|)';
const absoluteDelay = new Date(testScheduler.now() + t);
const result = e1.pipe(delay(absoluteDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raise error when source raises error', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a---b---#');
const e1subs = ' ^----------!';
const t = time(' ---| ');
// ---|
const expected = '------a---b#';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raise error when source raises error before absolute delay fires', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a---a-----# ');
const e1subs = ' ^--------------! ';
const t = time(' --------------------|');
const expected = '---------------# ';
const absoluteDelay = new Date(testScheduler.now() + t);
const result = e1.pipe(delay(absoluteDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raise error when source raises error after absolute delay fires', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot('---^---a--a---a---a--------b---b---b--#');
const e1subs = ' ^----------------------------------!';
const t = time(' -----------------| ');
const expected = ' -----------------(aaaa)-b---b---b--#';
const absoluteDelay = new Date(testScheduler.now() + t);
const result = e1.pipe(delay(absoluteDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay when source does not emit', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ----|');
const e1subs = ' ^---!';
const t = time(' ---| ');
const expected = '----|';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not delay when source is empty', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' | ');
const e1subs = ' (^!)';
const t = time(' ---|');
const expected = '| ';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delay complete when a value is scheduled', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' -a-| ');
const e1subs = ' ^--! ';
const t = time(' ---| ');
const expected = '----(a|)';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not complete when source does not complete', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a---b---------');
const e1subs = ' ^---------------!';
const t = time(' ---| ');
// ---|
const expected = '------a---b------';
const unsub = ' ----------------!';
const result = e1.pipe(delay(t));
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a---b----');
const e1subs = ' ^-------! ';
const t = time(' ---| ');
// ---|
const expected = '------a-- ';
const unsub = ' --------! ';
const result = e1.pipe(
mergeMap((x: any) => of(x)),
delay(t),
mergeMap((x: any) => of(x))
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not complete when source never completes', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
const e1 = cold(' - ');
const e1subs = ' ^ ';
const t = time(' ---|');
const expected = '- ';
const result = e1.pipe(delay(t));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should unsubscribe scheduled actions after execution', () => {
testScheduler.run(({ cold, time, expectObservable, expectSubscriptions }) => {
let subscribeSpy: any = null;
const counts: number[] = [];
const e1 = cold(' a| ');
const t = time(' -| ');
const expected = '--a-(a|)';
const result = e1.pipe(
repeatWhen((notifications) => {
const delayed = notifications.pipe(delay(t));
subscribeSpy = sinon.spy((delayed as any)['source'], 'subscribe');
return delayed;
}),
skip(1),
take(2),
tap({
next() {
const [[subscriber]] = subscribeSpy.args;
counts.push(subscriber._teardowns.size);
},
complete() {
expect(counts).to.deep.equal([1, 1]);
},
})
);
expectObservable(result).toBe(expected);
});
});
it('should be possible to delay complete by composition', () => {
testScheduler.run(({ hot, time, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a--b---| ');
const e1subs = ' ^---------! ';
const t = time(' --| ');
// --|
// --|
const expected = '-----a--b---|';
const result = concat(e1.pipe(delay(t)), of(undefined).pipe(delay(t), ignoreElements()));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
});