无法在Jest测试中读取null的属性'runnable'

Question

我创建了新的.spec文件，并且其中的测试由于以下错误而下降：

    TypeError: Cannot read property 'runnable' of null

      at ret (node_modules/selenium-webdriver/testing/index.js:175:25)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:388:26)
      at ProxyZoneSpec.Object.<anonymous>.ProxyZoneSpec.onInvoke (node_modules/zone.js/dist/proxy.js:128:39)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:387:32)
      at Zone.Object.<anonymous>.Zone.run (node_modules/zone.js/dist/zone.js:138:43)
      at Object.testBody.length.done (node_modules/jest-zone-patch/index.js:51:29)

我以前没看过这个，谷歌也没听说过。这是什么问题？

Answer 1

虽然在准备最小限度的复制代码来回答这个问题时，我注意到一个可疑的输入：

import { beforeEach } from 'selenium-webdriver/testing';