我正在使用 HttpClientModule和 HttpClientJsonpModule在服务中发出 JSONP HTTP 请求。
app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule, HttpClientJsonpModule } from '@angular/common/http';
import { AppComponent } from './app.component';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
HttpClientModule,
HttpClientJsonpModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
此服务使用 jsonp来自 HttpClient class 的方法从指定的 URL 获取 JSONP 响应。我认为这个响应被 JsonpInterceptor 拦截了并发送到JsonpClientBackend处理请求的地方。
example.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Injectable()
export class ExampleService {
url = "https://archive.org/index.php?output=json&callback=callback";
constructor(private http: HttpClient) { }
getData() {
return this.http.jsonp(this.url, 'callback');
}
}
使用 HttpClientTestingModule , 我注入(inject) HttpTestingController这样我就可以模拟并刷新我的 JSONP HTTP 请求。
example.service.spec.ts
import { TestBed, inject } from '@angular/core/testing';
import {
HttpClientTestingModule,
HttpTestingController
} from '@angular/common/http/testing';
import { ExampleService } from './example.service';
describe('ExampleService', () => {
let service: ExampleService;
let httpMock: HttpTestingController;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [ExampleService]
});
service = TestBed.get(ExampleService);
httpMock = TestBed.get(HttpTestingController);
});
describe('#getData', () => {
it('should return an Observable<any>', () => {
const dummyData = { id: 1 };
service.getData().subscribe(data => {
expect(data).toEqual(dummyData);
});
const req = httpMock.expectOne(service.url); // Error
expect(req.request.method).toBe('JSONP');
req.flush(dummyData);
});
});
});
最后,我得到了错误
错误:预期有一个符合条件“匹配 URL:https://archive.org/index.php?output=json&callback=callback”的匹配请求,但没有找到。
如果我将请求方法更改为 GET,此测试将按预期工作。
据我所知,HttpClientTestingModule 使用 HttpClientTestingBackend,但没有 JsonpClientTestingBackend 或相应的拦截器。
如何在 Angular 中测试 JSONP HTTP 请求?
最佳答案
根据 Angular 开发人员的说法,这是 a bug .现在有一个解决方法。
example.service.spec.ts
import { TestBed, inject } from '@angular/core/testing';
// Import the HttpClientJsonpModule, HttpBackend, and JsonpClientBackend
import { HttpClientJsonpModule, HttpBackend, JsonpClientBackend } from '@angular/common/http';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { ExampleService } from './example.service';
describe('ExampleService', () => {
let service: ExampleService;
let httpMock: HttpTestingController;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
// Use the HttpBackend instead of the JsonpClientBackend
providers: [ExampleService, { provide: JsonpClientBackend, useExisting: HttpBackend }]
});
service = TestBed.get(ExampleService);
httpMock = TestBed.get(HttpTestingController);
});
describe('#getData', () => {
it('should return an Observable<any>', () => {
const dummyData = { id: 1 };
service.getData().subscribe(data => {
expect(data).toEqual(dummyData);
});
// Pass a function to the expectOne method
const req = httpMock.expectOne(request => request.url === service.url);
expect(req.request.method).toBe('JSONP');
req.flush(dummyData);
});
});
});
关于javascript - 如何在 Angular 中测试 JSONP HTTP 请求?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47703877/