/
forkJoin-spec.ts
599 lines (501 loc) · 19 KB
/
forkJoin-spec.ts
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/** @prettier */
import { expect } from 'chai';
import { finalize, forkJoin, map, of, timer } from 'rxjs';
import { lowerCaseO } from '../helpers/test-helper';
import { TestScheduler } from 'rxjs/testing';
import { observableMatcher } from '../helpers/observableMatcher';
/** @test {forkJoin} */
describe('forkJoin', () => {
let rxTestScheduler: TestScheduler;
beforeEach(() => {
rxTestScheduler = new TestScheduler(observableMatcher);
});
it('should join the last values of the provided observables into an array', () => {
rxTestScheduler.run(({ hot, cold, expectObservable }) => {
const s1 = hot(' -a--b-----c-d-e-|');
const s2 = hot(' --------f--g-h-i--j-|');
const s3 = cold(' --1--2-3-4---|');
const e1 = forkJoin([s1, s2, s3]);
const expected = '--------------------(x|)';
expectObservable(e1).toBe(expected, { x: ['e', 'j', '4'] });
});
});
it('should support a resultSelector with an Array of ObservableInputs', () => {
const results: Array<number | string> = [];
forkJoin([of(1, 2, 3), of(4, 5, 6), of(7, 8, 9)], (a: number, b: number, c: number) => a + b + c).subscribe({
next(value) {
results.push(value);
},
error(err) {
throw err;
},
complete() {
results.push('done');
},
});
expect(results).to.deep.equal([18, 'done']);
});
it('should support a resultSelector with a spread of ObservableInputs', () => {
const results: Array<number | string> = [];
forkJoin(of(1, 2, 3), of(4, 5, 6), of(7, 8, 9), (a: number, b: number, c: number) => a + b + c).subscribe({
next(value) {
results.push(value);
},
error(err) {
throw err;
},
complete() {
results.push('done');
},
});
expect(results).to.deep.equal([18, 'done']);
});
it('should accept single observable', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin(hot('--a--b--c--d--|'));
const expected = ' --------------(x|)';
expectObservable(e1).toBe(expected, { x: ['d'] });
});
});
describe('forkJoin([input1, input2, input3])', () => {
it('should join the last values of the provided observables into an array', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = hot(' --1--2--3--|');
const e1 = forkJoin([s1, s2, s3]);
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: ['d', 'b', '3'] });
});
});
it('should allow emit null or undefined', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e2 = forkJoin([
hot(' --a--b--c--d--|', { d: null }),
hot(' (b|)'),
hot(' --1--2--3--|'),
hot(' -----r--t--u--|', { u: undefined }),
]);
const expected2 = '--------------(x|)';
expectObservable(e2).toBe(expected2, { x: [null, 'b', '3', undefined] });
});
});
it('should accept array of observable contains single', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const e1 = forkJoin([s1]);
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: ['d'] });
});
});
it('should accept lowercase-o observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = lowerCaseO('1', '2', '3');
const e1 = forkJoin([s1, s2, s3]);
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: ['d', 'b', '3'] });
});
});
it('should accept empty lowercase-o observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = lowerCaseO();
const e1 = forkJoin([s1, s2, s3]);
const expected = '|';
expectObservable(e1).toBe(expected);
});
});
it('should accept promise', (done) => {
rxTestScheduler.run(() => {
const e1 = forkJoin([of(1), Promise.resolve(2)]);
e1.subscribe({
next: (x) => expect(x).to.deep.equal([1, 2]),
complete: done,
});
});
});
it('should accept array of observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = hot(' --1--2--3--|');
const e1 = forkJoin([s1, s2, s3]);
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: ['d', 'b', '3'] });
});
});
it('should not emit if any of source observable is empty', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = hot(' ------------------|');
const e1 = forkJoin([s1, s2, s3]);
const expected = '------------------|';
expectObservable(e1).toBe(expected);
});
});
it('should complete early if any of source is empty and completes before than others', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --a--b--c--d--|');
const s2 = hot(' (b|)');
const s3 = hot(' ---------|');
const e1 = forkJoin([s1, s2, s3]);
const expected = '---------|';
expectObservable(e1).toBe(expected);
});
});
it('should complete when all sources are empty', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --------------|');
const s2 = hot(' ---------|');
const e1 = forkJoin([s1, s2]);
const expected = '---------|';
expectObservable(e1).toBe(expected);
});
});
it('should not complete when only source never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin([hot('--------------')]);
const expected = ' --------------';
expectObservable(e1).toBe(expected);
});
});
it('should not complete when one of the sources never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot('--------------');
const s2 = hot('-a---b--c--|');
const e1 = forkJoin([s1, s2]);
const expected = '-';
expectObservable(e1).toBe(expected);
});
});
it('should complete when one of the sources never completes but other completes without values', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' --------------');
const s2 = hot(' ------|');
const e1 = forkJoin([s1, s2]);
const expected = '------|';
expectObservable(e1).toBe(expected);
});
});
it('should complete if source is not provided', () => {
rxTestScheduler.run(({ expectObservable }) => {
const e1 = forkJoin();
const expected = '|';
expectObservable(e1).toBe(expected);
});
});
it('should complete if sources list is empty', () => {
rxTestScheduler.run(({ expectObservable }) => {
const e1 = forkJoin([]);
const expected = '|';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when any of source raises error with empty observable', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' ------#');
const s2 = hot(' ---------|');
const e1 = forkJoin([s1, s2]);
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when any of source raises error with source that never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' ------#');
const s2 = hot(' ----------');
const e1 = forkJoin([s1, s2]);
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when source raises error', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const s1 = hot(' ------#');
const s2 = hot(' ---a-----|');
const e1 = forkJoin([s1, s2]);
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should allow unsubscribing early and explicitly', () => {
rxTestScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot('--a--^--b--c---d-| ');
const e1subs = ' ^--------! ';
const e2 = hot('---e-^---f--g---h-|');
const e2subs = ' ^--------! ';
const expected = ' ---------- ';
const unsub = ' ---------! ';
const result = forkJoin([e1, e2]);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should unsubscribe other Observables, when one of them errors', () => {
rxTestScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot('--a--^--b--c---d-| ');
const e1subs = ' ^--------! ';
const e2 = hot('---e-^---f--g-#');
const e2subs = ' ^--------! ';
const expected = ' ---------# ';
const result = forkJoin([e1, e2]);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
});
it('should finalize in the proper order', () => {
const results: any[] = [];
const source = forkJoin(
[1, 2, 3, 4].map((n) =>
timer(100, rxTestScheduler).pipe(
map(() => n),
finalize(() => results.push(`finalized ${n}`))
)
)
);
source.subscribe((value) => results.push(value));
rxTestScheduler.flush();
expect(results).to.deep.equal(['finalized 1', 'finalized 2', 'finalized 3', 'finalized 4', [1, 2, 3, 4]]);
});
describe('forkJoin({ foo, bar, baz })', () => {
it('should join the last values of the provided observables into an array', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: hot(' --1--2--3--|'),
});
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: { foo: 'd', bar: 'b', baz: '3' } });
});
});
it('should allow emit null or undefined', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e2 = forkJoin({
foo: hot(' --a--b--c--d--|', { d: null }),
bar: hot(' (b|)'),
baz: hot(' --1--2--3--|'),
qux: hot(' -----r--t--u--|', { u: undefined }),
});
const expected2 = '--------------(x|)';
expectObservable(e2).toBe(expected2, { x: { foo: null, bar: 'b', baz: '3', qux: undefined } });
});
});
it('should accept array of observable contains single', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
});
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: { foo: 'd' } });
});
});
it('should accept lowercase-o observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: lowerCaseO('1', '2', '3'),
});
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: { foo: 'd', bar: 'b', baz: '3' } });
});
});
it('should accept empty lowercase-o observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: lowerCaseO(),
});
const expected = '|';
expectObservable(e1).toBe(expected);
});
});
it('should accept promise', (done) => {
const e1 = forkJoin({
foo: of(1),
bar: Promise.resolve(2),
});
e1.subscribe({
next: (x) => expect(x).to.deep.equal({ foo: 1, bar: 2 }),
complete: done,
});
});
it('should accept an object of observables', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: hot(' --1--2--3--|'),
});
const expected = '--------------(x|)';
expectObservable(e1).toBe(expected, { x: { foo: 'd', bar: 'b', baz: '3' } });
});
});
it('should not emit if any of source observable is empty', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: hot(' ------------------|'),
});
const expected = '------------------|';
expectObservable(e1).toBe(expected);
});
});
// TODO: This seems odd. Filed an issue for discussion here: https://github.com/ReactiveX/rxjs/issues/5561
it('should complete early if any of source is empty and completes before than others', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --a--b--c--d--|'),
bar: hot(' (b|)'),
baz: hot(' ---------|'),
});
const expected = '---------|';
expectObservable(e1).toBe(expected);
});
});
it('should complete when all sources are empty', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --------------|'),
bar: hot(' ---------|'),
});
const expected = '---------|';
expectObservable(e1).toBe(expected);
});
});
it('should not complete when only source never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --------------'),
});
const expected = '--------------';
expectObservable(e1).toBe(expected);
});
});
it('should not complete when one of the sources never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --------------'),
bar: hot(' -a---b--c--|'),
});
const expected = '--------------';
expectObservable(e1).toBe(expected);
});
});
it('should complete when one of the sources never completes but other completes without values', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
foo: hot(' --------------'),
bar: hot(' ------|'),
});
const expected = '------|';
expectObservable(e1).toBe(expected);
});
});
// TODO(benlesh): this is the wrong behavior, it should probably throw right away.
it('should have same v5/v6 throwing behavior full argument of null', (done) => {
rxTestScheduler.run(() => {
// It doesn't throw when you pass null
expect(() => forkJoin(null as any)).not.to.throw();
// It doesn't even throw if you subscribe to forkJoin(null).
expect(() =>
forkJoin(null as any).subscribe({
// It sends the error to the subscription.
error: () => done(),
})
).not.to.throw();
});
});
it('should complete if sources object is empty', () => {
rxTestScheduler.run(({ expectObservable }) => {
const e1 = forkJoin({});
const expected = '|';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when any of source raises error with empty observable', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
lol: hot(' ------#'),
wut: hot(' ---------|'),
});
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when any of source raises error with source that never completes', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
lol: hot(' ------#'),
wut: hot(' ----------'),
});
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should raise error when source raises error', () => {
rxTestScheduler.run(({ hot, expectObservable }) => {
const e1 = forkJoin({
lol: hot(' ------#'),
foo: hot(' ---a-----|'),
});
const expected = '------#';
expectObservable(e1).toBe(expected);
});
});
it('should allow unsubscribing early and explicitly', () => {
rxTestScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot('--a--^--b--c---d-| ');
const e1subs = ' ^--------! ';
const e2 = hot('---e-^---f--g---h-|');
const e2subs = ' ^--------! ';
const expected = ' ---------- ';
const unsub = ' ---------! ';
const result = forkJoin({
e1,
e2,
});
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should unsubscribe other Observables, when one of them errors', () => {
rxTestScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--^--b--c---d-| ');
const e1subs = ' ^--------! ';
const e2 = hot(' ---e-^---f--g-#');
const e2subs = ' ^--------! ';
const expected = ' ---------# ';
const result = forkJoin({
e1,
e2,
});
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should accept promise as the first arg', (done) => {
const e1 = forkJoin(Promise.resolve(1));
const values: number[][] = [];
e1.subscribe({
next: (x) => values.push(x),
complete: () => {
expect(values).to.deep.equal([[1]]);
done();
},
});
});
});
});