在组件中:
private xxxService: XxxService,
const xxxList = await this.xxxService.getSomething(this.someid).toPromise();
在测试文件component.spec.ts中:
import {Observable, of} from 'rxjs';
const xxxServiceStub = {
getSomething: () => Promise.resolve([])
};
beforeEach((async(next) => {
await TestBed.configureTestingModule({
declarations: [someComponent],
imports: [
....
],
providers: [
{provide: XxxService, useValue: xxxServiceStub},
]
}).compileComponents();
next();
}));
API:
public getSomething(someid): Observable<xxxRef[]> {
return this.httpClient
.get<xxxRef[]>(
${environment.url}/api/xxx?someid=${someid},
{
observe: 'response'
}
).pipe(
map(response => {
return response.body;
})
);
}
界面:
export interface xxxRef {
name: string;
id: number;
description?: string;
}
测试进行了,但是Karma的控制台有一个错误:
zone-evergreen.js:798未捕获错误:未捕获(已承诺):TypeError:this.xxxService.getSomething(...)。toPromise不是函数
您需要从getSomething
方法返回一个Observable,但要返回的Promise.resolve
不是Observable,这就是为什么会出错的原因。
将您的模拟方法更改为此
import { of } from 'rxjs';
...
const xxxServiceStub = {
getSomething: () => of([]) // this returns observable
};
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