javascript - rxjs jest 流中的模拟对象

Question

您好，我尝试测试这段代码

import { Observable, Subscriber } from 'rxjs';
function getJavaRequest<T>(globals: any): (name: string) => Observable<T> {
return (name: string) => Observable
    .create((observer: Subscriber<T>) => {
        globals[name] = (event: T) => observer.next(event);
    });
    };

我正在使用 jest 框架。我想 Jest 创建模拟对象并检查该函数创建流并向流添加一些东西我有这样的东西

import {getJavaRequest } from './JcefStreams';
import { TestScheduler } from 'rxjs/testing';
test('It should return mocked object from stream', () => {
const testObject = jest.mock();
let test;
getJavaRequest(testObject).subscribe(e: any => e == test);

expect(test).toBe(global);
});

但它不能正常工作

Answer 1

您需要创建一个模拟的可观察对象。

例如:

//...
import { of } from 'rxjs/observable/of';

class RequestServiceMock {
  get = jest.fn();
}

describe('', () => {
  it('', () => {
    const requestService = RequestService as RequestServiceMock;
    requestService.get.mockReturnValue(of([]));

    requestService.get().subscribe(_ => expect(_).toBeTruthy())
  });
});

希望这对您有所帮助。