标签: asynctest

我在模拟aiohttp.client.ClientSession.get上下文管理器时遇到了一些麻烦.我找到了一些文章,这里有一个似乎正在起作用的例子:第1条

所以我要测试的代码:

async_app.py

import random
from aiohttp.client import ClientSession

async def get_random_photo_url():
    while True:
        async with ClientSession() as session:
            async with session.get('random.photos') as resp:
                json = await resp.json()
        photos = json['photos']
        if not photos:
            continue
        return random.choice(photos)['img_src']

并测试:

test_async_app.py

from asynctest import CoroutineMock, MagicMock, patch

from asynctest import TestCase as TestCaseAsync

from async_app import get_random_photo_url


class AsyncContextManagerMock(MagicMock):
    async def __aenter__(self):
        return self.aenter

    async def __aexit__(self, *args):
        pass

class TestAsyncExample(TestCaseAsync):
    @patch('aiohttp.client.ClientSession.get', new_callable=AsyncContextManagerMock)
    async def test_call_api_again_if_photos_not_found(self, mock_get):
        mock_get.return_value.aenter.json = CoroutineMock(side_effect=[{'photos': []}, …

我想知道为什么jest.useFakeTimers与setTimeoutRxJs的延迟运算符一起工作但不是:

jest.useFakeTimers();
import {Observable} from 'rxjs/Observable';
import 'rxjs';

describe('timers', () => {
    it('should resolve setTimeout synchronously', () => {
        const spy = jest.fn();
        setTimeout(spy, 20);
        expect(spy).not.toHaveBeenCalled();
        jest.runTimersToTime(20);
        expect(spy).toHaveBeenCalledTimes(1);
    });
    it('should resolve setInterval synchronously', () => {
        const spy = jest.fn();
        setInterval(spy, 20);
        expect(spy).not.toHaveBeenCalled();
        jest.runTimersToTime(20);
        expect(spy).toHaveBeenCalledTimes(1);
        jest.runTimersToTime(20);
        expect(spy).toHaveBeenCalledTimes(2);
    });
    it('should work with observables', () => {
        const delay$ = Observable.of(true).delay(20);
        const spy = jest.fn();
        delay$.subscribe(spy);
        expect(spy).not.toHaveBeenCalled();
        jest.runTimersToTime(2000);
        expect(spy).toHaveBeenCalledTimes(1);
    });
});

仅供参考:使用20或2000作为参数jest.runTimersToTime没有任何区别.使用jest.runAllTimers()使测试过去