angular-cn/packages/core/test/event_emitter_spec.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {AsyncTestCompleter, beforeEach, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';
import {filter} from 'rxjs/operators';
import {EventEmitter} from '../src/event_emitter';
{
describe('EventEmitter', () => {
let emitter: EventEmitter<any>;
beforeEach(() => {
emitter = new EventEmitter();
});
it('should call the next callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
emitter.subscribe({
next: (value: any) => {
expect(value).toEqual(99);
async.done();
}
});
emitter.emit(99);
}));
it('should call the throw callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
emitter.subscribe({
next: () => {},
error: (error: any) => {
expect(error).toEqual('Boom');
async.done();
}
});
emitter.error('Boom');
}));
it('should work when no throw callback is provided',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
emitter.subscribe({
next: () => {},
error: (_: any) => {
async.done();
}
});
emitter.error('Boom');
}));
it('should call the return callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
emitter.subscribe({
next: () => {},
error: (_: any) => {},
complete: () => {
async.done();
}
});
emitter.complete();
}));
it('should subscribe to the wrapper synchronously', () => {
let called = false;
emitter.subscribe({
next: (value: any) => {
called = true;
}
});
emitter.emit(99);
expect(called).toBe(true);
});
it('delivers next and error events synchronously',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
const log: any[] /** TODO #9100 */ = [];
emitter.subscribe({
next: (x: any) => {
log.push(x);
expect(log).toEqual([1, 2]);
},
error: (err: any) => {
log.push(err);
expect(log).toEqual([1, 2, 3, 4]);
async.done();
}
});
log.push(1);
emitter.emit(2);
log.push(3);
emitter.error(4);
log.push(5);
}));
it('delivers next and complete events synchronously', () => {
const log: any[] /** TODO #9100 */ = [];
emitter.subscribe({
next: (x: any) => {
log.push(x);
expect(log).toEqual([1, 2]);
},
error: null,
complete: () => {
log.push(4);
expect(log).toEqual([1, 2, 3, 4]);
}
});
log.push(1);
emitter.emit(2);
log.push(3);
emitter.complete();
log.push(5);
expect(log).toEqual([1, 2, 3, 4, 5]);
});
it('delivers events asynchronously when forced to async mode',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
const e = new EventEmitter(true);
const log: any[] /** TODO #9100 */ = [];
e.subscribe((x: any) => {
log.push(x);
expect(log).toEqual([1, 3, 2]);
async.done();
});
log.push(1);
e.emit(2);
log.push(3);
}));
it('reports whether it has subscribers', () => {
const e = new EventEmitter(false);
expect(e.observers.length > 0).toBe(false);
e.subscribe({next: () => {}});
expect(e.observers.length > 0).toBe(true);
});
it('remove a subscriber subscribed directly to EventEmitter', () => {
const sub = emitter.subscribe();
expect(emitter.observers.length).toBe(1);
sub.unsubscribe();
expect(emitter.observers.length).toBe(0);
});
it('remove a subscriber subscribed after applying operators with pipe()', () => {
const sub = emitter.pipe(filter(() => true)).subscribe();
expect(emitter.observers.length).toBe(1);
sub.unsubscribe();
expect(emitter.observers.length).toBe(0);
});
it('unsubscribing a subscriber invokes the dispose method', () => {
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
const sub = emitter.subscribe();
sub.add(() => async.done());
sub.unsubscribe();
});
});
it('unsubscribing a subscriber after applying operators with pipe() invokes the dispose method',
() => {
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
const sub = emitter.pipe(filter(() => true)).subscribe();
sub.add(() => async.done());
sub.unsubscribe();
});
});
it('error thrown inside an Rx chain propagates to the error handler and disposes the chain',
() => {
let errorPropagated = false;
emitter
.pipe(
filter(() => {
throw new Error();
}),
)
.subscribe(
() => {},
err => errorPropagated = true,
);
emitter.next(1);
expect(errorPropagated).toBe(true);
expect(emitter.observers.length).toBe(0);
});
it('error sent by EventEmitter should dispose the Rx chain and remove subscribers', () => {
let errorPropagated = false;
emitter.pipe(filter(() => true))
.subscribe(
() => {},
err => errorPropagated = true,
);
emitter.error(1);
expect(errorPropagated).toBe(true);
expect(emitter.observers.length).toBe(0);
});
// TODO: vsavkin: add tests cases
// should call dispose on the subscription if generator returns {done:true}
// should call dispose on the subscription on throw
// should call dispose on the subscription on return
});
}