angular-docs-cn/packages/common/http/test/module_spec.ts

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TypeScript

/**
* @license
* Copyright Google Inc. All Rights Reserved.JsonpCallbackContext
*
* 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 {HttpHandler} from '@angular/common/http/src/backend';
import {HttpClient} from '@angular/common/http/src/client';
import {HTTP_INTERCEPTORS, HttpInterceptor} from '@angular/common/http/src/interceptor';
import {HttpRequest} from '@angular/common/http/src/request';
import {HttpEvent, HttpResponse} from '@angular/common/http/src/response';
import {HttpTestingController} from '@angular/common/http/testing/src/api';
import {HttpClientTestingModule} from '@angular/common/http/testing/src/module';
import {TestRequest} from '@angular/common/http/testing/src/request';
import {Injectable, Injector} from '@angular/core';
import {TestBed} from '@angular/core/testing';
import {Observable} from 'rxjs';
import {map} from 'rxjs/operators';
class TestInterceptor implements HttpInterceptor {
constructor(private value: string) {}
intercept(req: HttpRequest<any>, delegate: HttpHandler): Observable<HttpEvent<any>> {
const existing = req.headers.get('Intercepted');
const next = !!existing ? existing + ',' + this.value : this.value;
req = req.clone({setHeaders: {'Intercepted': next}});
return delegate.handle(req).pipe(map(event => {
if (event instanceof HttpResponse) {
const existing = event.headers.get('Intercepted');
const next = !!existing ? existing + ',' + this.value : this.value;
return event.clone({headers: event.headers.set('Intercepted', next)});
}
return event;
}));
}
}
class InterceptorA extends TestInterceptor {
constructor() { super('A'); }
}
class InterceptorB extends TestInterceptor {
constructor() { super('B'); }
}
@Injectable()
class ReentrantInterceptor implements HttpInterceptor {
constructor(private client: HttpClient) {}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
return next.handle(req);
}
}
{
describe('HttpClientModule', () => {
let injector: Injector;
beforeEach(() => {
injector = TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [
{provide: HTTP_INTERCEPTORS, useClass: InterceptorA, multi: true},
{provide: HTTP_INTERCEPTORS, useClass: InterceptorB, multi: true},
],
});
});
it('initializes HttpClient properly', done => {
injector.get(HttpClient).get('/test', {responseType: 'text'}).subscribe(value => {
expect(value).toBe('ok!');
done();
});
injector.get(HttpTestingController).expectOne('/test').flush('ok!');
});
it('intercepts outbound responses in the order in which interceptors were bound', done => {
injector.get(HttpClient)
.get('/test', {observe: 'response', responseType: 'text'})
.subscribe(value => done());
const req = injector.get(HttpTestingController).expectOne('/test') as TestRequest;
expect(req.request.headers.get('Intercepted')).toEqual('A,B');
req.flush('ok!');
});
it('intercepts inbound responses in the right (reverse binding) order', done => {
injector.get(HttpClient)
.get('/test', {observe: 'response', responseType: 'text'})
.subscribe(value => {
expect(value.headers.get('Intercepted')).toEqual('B,A');
done();
});
injector.get(HttpTestingController).expectOne('/test').flush('ok!');
});
it('allows interceptors to inject HttpClient', done => {
TestBed.resetTestingModule();
injector = TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [
{provide: HTTP_INTERCEPTORS, useClass: ReentrantInterceptor, multi: true},
],
});
injector.get(HttpClient).get('/test').subscribe(() => { done(); });
injector.get(HttpTestingController).expectOne('/test').flush('ok!');
});
});
}