如何在Jest

Question

我在使用react-native和react-native-router-flux的jest测试中出现以下错误

Runtime Error
  - TypeError: Cannot read property 'source' of undefined
        at Object.<anonymous> (node_modules/react-native-router-flux/src/NavBar.js:155:45)
        at Object.<anonymous> (node_modules/react-native-router-flux/src/DefaultRenderer.js:21:13)
        at Object.<anonymous> (node_modules/react-native-router-flux/index.js:3:22)

这是导致麻烦的行

backButtonImage：Image.propTypes.source，

所以我猜想Image.propTypes定义不正确

我该如何解决这个问题？