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cache-spec.ts
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import * as Rx from '../../dist/cjs/Rx';
import {expect} from 'chai';
declare const {hot, cold, time, expectObservable};
declare const rxTestScheduler: Rx.TestScheduler;
/** @test {cache} */
describe('Observable.prototype.cache', () => {
it('should just work™', () => {
let subs = 0;
const source = Rx.Observable.create(observer => {
subs++;
observer.next(1);
observer.next(2);
observer.next(3);
observer.complete();
}).cache();
let results = [];
source.subscribe(x => results.push(x));
expect(results).to.deep.equal([1, 2, 3]);
expect(subs).to.equal(1);
results = [];
source.subscribe(x => results.push(x));
expect(results).to.deep.equal([1, 2, 3]);
expect(subs).to.equal(1);
});
it('should replay values upon subscription', () => {
const s1 = hot( '----a---b---c---| ').cache(undefined, undefined, rxTestScheduler);
const expected1 = '----a---b---c---| ';
const expected2 = ' (abc|)';
const sub2 = '------------------| ';
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => expectObservable(s1).toBe(expected2), time(sub2));
});
it('should not replay values after error with a hot observable', () => {
const s1 = hot('---^---a---b---c---# ').cache(undefined, undefined, rxTestScheduler);
const expected1 = '----a---b---c---# ';
const expected2 = ' -';
const t = time( '------------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should be resubscribable after error with a cold observable', () => {
const s1 = cold( '----a---b---c---# ').cache(undefined, undefined, rxTestScheduler);
const expected1 = '----a---b---c---# ';
const expected2 = ' ----a---b---c---#';
const t = time( '------------------| ');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should replay values and and share', () => {
const s1 = hot('---^---a---b---c------------d--e--f-|').cache(undefined, undefined, rxTestScheduler);
const expected1 = '----a---b---c------------d--e--f-|';
const expected2 = ' (abc)----d--e--f-|';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should have a bufferCount that limits the replay test 1', () => {
const s1 = hot('---^---a---b---c------------d--e--f-|').cache(1);
const expected1 = '----a---b---c------------d--e--f-|';
const expected2 = ' c--------d--e--f-|';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should have a bufferCount that limits the replay test 2', () => {
const s1 = hot( '----a---b---c------------d--e--f-|').cache(2);
const expected1 = '----a---b---c------------d--e--f-|';
const expected2 = ' (bc)-----d--e--f-|';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => expectObservable(s1).toBe(expected2), t);
});
it('should accept a windowTime that limits the replay', () => {
const w = time( '----------|');
const s1 = hot('---^---a---b---c------------d--e--f-|').cache(Number.POSITIVE_INFINITY, w, rxTestScheduler);
const expected1 = '----a---b---c------------d--e--f-|';
const expected2 = ' (bc)-----d--e--f-|';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should handle empty', () => {
const s1 = cold('|').cache(undefined, undefined, rxTestScheduler);
const expected1 = '|';
const expected2 = ' |';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should handle throw', () => {
const s1 = cold('#').cache(undefined, undefined, rxTestScheduler);
const expected1 = '#';
const expected2 = ' #';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should handle never', () => {
const s1 = cold('-').cache(undefined, undefined, rxTestScheduler);
const expected1 = '-';
const expected2 = ' -';
const t = time( '----------------|');
expectObservable(s1).toBe(expected1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected2);
}, t);
});
it('should multicast a completion', () => {
const s1 = hot('--a--^--b------c-----d------e-|').cache(undefined, undefined, rxTestScheduler);
const t1 = time( '| ');
const e1 = '---b------c-----d------e-|';
const t2 = time( '----------| ');
const e2 = ' (bc)--d------e-|';
const t3 = time( '----------------| ');
const e3 = ' (bcd)--e-|';
const expected = [e1, e2, e3];
[t1, t2, t3].forEach((t: any, i: number) => {
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected[i]);
}, t);
});
});
it('should multicast an error', () => {
const s1 = hot('--a--^--b------c-----d------e-#').cache(undefined, undefined, rxTestScheduler);
const t1 = time( '| ');
const e1 = '---b------c-----d------e-#';
const t2 = time( '----------| ');
const e2 = ' (bc)--d------e-#';
const t3 = time( '----------------| ');
const e3 = ' (bcd)--e-#';
const expected = [e1, e2, e3];
[t1, t2, t3].forEach((t: any, i: number) => {
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(expected[i]);
}, t);
});
});
it('should limit replay by both count and a window time, test 2', () => {
const w = time( '-----------|');
const s1 = hot('--a--^---b---c----d----e------f--g--h--i-------|').cache(4, w, rxTestScheduler);
const e1 = '----b---c----d----e------f--g--h--i-------|';
const t1 = time( '--------------------|');
// -----------|
const e2 = ' (de)-f--g--h--i-------|'; // time wins
const t2 = time( '-----------------------------------|');
const e3 = ' (fghi)-|'; // count wins
// -----------|
expectObservable(s1).toBe(e1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(e2);
}, t1);
rxTestScheduler.schedule(() => {
expectObservable(s1).toBe(e3);
}, t2);
});
it('should be retryable', () => {
const source = cold('--1-2-3-#');
const subs = ['^ ! ',
' ^ ! ',
' ^ !'];
const expected = '--1-2-3---1-2-3---1-2-3-#';
const result = source.cache(undefined, undefined, rxTestScheduler).retry(2);
expectObservable(result).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
});