MockBackend
class
deprecated
A mock backend for testing the Http service.
Deprecated: see https://angular.io/guide/http
class MockBackend implements ConnectionBackend {
connections: any
connectionsArray: MockConnection[]
pendingConnections: any
verifyNoPendingRequests()
resolveAllConnections()
createConnection(req: Request): MockConnection
}
Description
This class can be injected in tests, and should be used to override providers to other backends, such as XHRBackend.
Properties
Property | Description |
---|---|
connections: any
|
This property only exists in the mock implementation, not in real Backends. |
connectionsArray: MockConnection[]
|
An array representation of This property only exists in the mock implementation, not in real Backends. |
pendingConnections: any
|
This property only exists in the mock implementation, not in real Backends. |
Methods
verifyNoPendingRequests() |
---|
Checks all connections, and raises an exception if any connection has not received a response. |
verifyNoPendingRequests()ParametersThere are no parameters.
|
This method only exists in the mock implementation, not in real Backends. |
resolveAllConnections() |
---|
Can be used in conjunction with verifyNoPendingRequests to resolve any not-yet-resolve connections, if it's expected that there are connections that have not yet received a response.
|
resolveAllConnections()ParametersThere are no parameters.
|
This method only exists in the mock implementation, not in real Backends. |
createConnection() | |||
---|---|---|---|
Creates a new MockConnection. This is equivalent to calling new MockConnection() , except that it also will emit the new Connection to the connections emitter of this MockBackend instance. This method will usually only be used by tests against the framework itself, not by end-users.
| |||
createConnection(req: Request): MockConnectionParameters
Returns
|
Usage notes
Example
import {Injectable, Injector} from '@angular/core'; import {async, fakeAsync, tick} from '@angular/core/testing'; import {BaseRequestOptions, ConnectionBackend, Http, RequestOptions} from '@angular/http'; import {Response, ResponseOptions} from '@angular/http'; import {MockBackend, MockConnection} from '@angular/http/testing'; const HERO_ONE = 'HeroNrOne'; const HERO_TWO = 'WillBeAlwaysTheSecond'; @Injectable() class HeroService { constructor(private http: Http) {} getHeroes(): Promise<String[]> { return this.http.get('myservices.de/api/heroes') .toPromise() .then(response => response.json().data) .catch(e => this.handleError(e)); } private handleError(error: any): Promise<any> { console.error('An error occurred', error); return Promise.reject(error.message || error); } } describe('MockBackend HeroService Example', () => { beforeEach(() => { this.injector = Injector.create([ {provide: ConnectionBackend, useClass: MockBackend}, {provide: RequestOptions, useClass: BaseRequestOptions}, Http, HeroService, ]); this.heroService = this.injector.get(HeroService); this.backend = this.injector.get(ConnectionBackend) as MockBackend; this.backend.connections.subscribe((connection: any) => this.lastConnection = connection); }); it('getHeroes() should query current service url', () => { this.heroService.getHeroes(); expect(this.lastConnection).toBeDefined('no http service connection at all?'); expect(this.lastConnection.request.url).toMatch(/api\/heroes$/, 'url invalid'); }); it('getHeroes() should return some heroes', fakeAsync(() => { let result: String[]; this.heroService.getHeroes().then((heroes: String[]) => result = heroes); this.lastConnection.mockRespond(new Response(new ResponseOptions({ body: JSON.stringify({data: [HERO_ONE, HERO_TWO]}), }))); tick(); expect(result.length).toEqual(2, 'should contain given amount of heroes'); expect(result[0]).toEqual(HERO_ONE, ' HERO_ONE should be the first hero'); expect(result[1]).toEqual(HERO_TWO, ' HERO_TWO should be the second hero'); })); it('getHeroes() while server is down', fakeAsync(() => { let result: String[]; let catchedError: any; this.heroService.getHeroes() .then((heroes: String[]) => result = heroes) .catch((error: any) => catchedError = error); this.lastConnection.mockError(new Response(new ResponseOptions({ status: 404, statusText: 'URL not Found', }))); tick(); expect(result).toBeUndefined(); expect(catchedError).toBeDefined(); })); });
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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/http/testing/MockBackend