测试HTTPClient Angular 4“;“预期未定义待定义”;
测试Angular 4 HTTPClient 此后 在职测试HTTPClient Angular 4“;“预期未定义待定义”;,angular,integration-testing,karma-jasmine,Angular,Integration Testing,Karma Jasmine,测试Angular 4 HTTPClient 此后 在职 getBlogs(){ return this._http.get(this.blogsURL+'blogs') .map((result: Response ) => { this.blogs = result['blogs']; return this.blogs; }) } 然后测试: 我开始将服务和HttpTestin
getBlogs(){
return this._http.get(this.blogsURL+'blogs')
.map((result: Response ) => {
this.blogs = result['blogs'];
return this.blogs;
})
}
然后测试:
我开始将服务和HttpTestingController注入到it块中,但在每项工作正常之前将其放入
当调用request.flush并激发subscribe方法时,就会出现问题,因为没有返回结果
import { TestBed, inject } from '@angular/core/testing';
import { HttpClientModule } from '@angular/common/http';
import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
import { BlogsService } from './blogs.service';
import { Blog } from '../models/blog';
describe('BlogsService', () => {
let service:BlogsService;
let blogsURL:string;
let httpMock:HttpTestingController;
beforeEach(() => {
TestBed.configureTestingModule({
providers: [BlogsService],
imports: [HttpClientTestingModule]
});
service = TestBed.get(BlogsService);
httpMock = TestBed.get(HttpTestingController);
blogsURL = 'http://localhost:3000/'
});
it('#getBlogs should return data',() => {
service
.getBlogs()
.subscribe(result => {
expect(result).toBeDefined();
expect(result.length).toBe(2);
expect(result).toEqual([
{
id: 1,
name: 'Foo',
numSales: 100
}, {
id: 2,
name: 'Bar',
numSales: 200
}
]);
});
// look up our request and access it
const request = httpMock.expectOne(blogsURL+'blogs');
// verify it is a GET
expect(request.request.method).toEqual('GET');
// Now, provide the answer to the caller above,
// flushing the data down the pipe to the caller and
// triggering the test's subscribe method
request.flush([
{
id: 1,
name: 'Foo',
numSales: 100
}, {
id: 2,
name: 'Bar',
numSales: 200
}
]);
//
// // make sure it actually got processed...
httpMock.verify();
});
});
假设您的url正确返回了数据,您似乎忘记了服务中的
map
函数中的result.json()。Angular http服务返回一个对象响应
,您需要调用它的json
函数来获取实际的json对象,然后才能返回数据。将您的getBlogs
方法更改为以下内容
getBlogs(){
return this._http.get(this.blogsURL+'blogs')
.map((result: Response ) => {
const resp = result.json();
this.blogs = resp['blogs'];
return this.blogs;
})
}
有一些尝试和错误(主要是错误)
我已经解决了这个问题,我想我对测试HTTPClient有了更好的理解
让我们从数据库服务器返回的内容开始
{message: 'Success', blogs: blogs}
一个json对象,包含一条消息和一组名为blogs的blog
接下来是服务中名为getBlogs的函数
这两条重要路线是:
this.blogs = res['blogs'];
return this.blogs;
这样做的目的是从结果中提取blogs数组,将其添加到变量this.blogs中,然后返回它
我一直忘记的是,我正在测试服务中的实际功能,而不是单独的实体,因此测试需要博客
要返回,这就是我得到未定义错误的原因,因此我添加了一个模拟博客数组:
blogs = [{_id: '1234',title: 'title1-test', vidUrl: 'XpiipWULkXk', script:'Some test script'}, {_id: '12345',title: 'title2', vidUrl: 'XpiipWULkXk', script:'Some test script2'}];
然后在flush语句中
request.flush({message:"Success", blogs:blogs});
因为这需要模拟从服务器返回的内容,所以代码可以提取它
完整代码:
import { TestBed, inject } from '@angular/core/testing';
import { HttpClientModule } from '@angular/common/http';
import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
import { BlogsService } from './blogs.service';
import { Blog } from '../models/blog';
describe('BlogsService', () => {
let service:BlogsService;
let blogsURL:string;
let httpMock: HttpTestingController;
let blogs:Blog[];
beforeEach(() => {
TestBed.configureTestingModule({
providers: [BlogsService],
imports: [HttpClientTestingModule]
});
service = TestBed.get(BlogsService);
httpMock = TestBed.get(HttpTestingController);
blogsURL = 'http://localhost:3000/';
blogs = [{_id: '1234',title: 'title1-test', vidUrl: 'XpiipWULkXk', script:'Some test script'}, {_id: '12345',title: 'title2', vidUrl: 'XpiipWULkXk', script:'Some test script2'}];
});
it('#getBlogs should return data',() => {
service
.getBlogs()
.subscribe(results => {
expect(results).toBeDefined();
//has to be what is returned by the function
expect(results).toEqual(blogs);
console.log(results)
});
// look up our request and access it
const request = httpMock.expectOne(blogsURL+'blogs');
// verify it is a GET
expect(request.request.method).toEqual('GET');
request.flush({message:"Success", blogs:blogs});
// // make sure it actually got processed...
httpMock.verify();
});
});
感谢您的回复,但是我使用的是HTTPClient Angular 4,当我看到您的时,它不需要做得很好。