我有一个“notifications.js”模块,看起来有点像这样:
import { Notifications, Permissions } from 'expo'
export function setLocalNotification(storage = AsyncStorage) {
return storage
.getItem(NOTIFICATION_KEY)
.then(JSON.parse)
.then(data => {
if (data === null) {
return Permissions.askAsync(
Permissions.NOTIFICATIONS
).then(({ status }) => {
if (status === 'granted') {
Notifications.cancelAllScheduledNotificationsAsync()
...etc.
在我的测试中,我想模拟权限和通知,以便我可以在 notification.spec.js 中执行类似的操作:
import { setLocalNotification } from './notifications'
import mockAsyncStorage from '../mock/AsyncStorage'
it('correctly cancels pending notifications', done => {
setLocalNotification(mockAsyncStorage).then(done())
expect(Permissions.askAsync).toBeCalled()
expect(Notifications.cancelAllScheduledNotificationsAsync)
.toBeCalled()
})
我尝试过使用各种方法jest.mock
and jest.setMock
但我似乎无法让这个工作。我如何以所需的方式模拟这些命名导入?例如,我尝试过这个:
jest.setMock('Permissions', () => ({
askAsync: jest
.fn()
.mockImplementationOnce(() => ({ status: 'granted' }))
}))
但这是行不通的。它抛出
'module Permissions cannot be found from notifications.spec.js'
如果我尝试模拟整个 expo 模块,则模拟的函数expect().toBeCalled()
返回假。