我正在 React Native 中进行玩笑测试，并且在我的项目中使用了 Snackbar。在执行 jest 时，我收到此错误。\'LENGTH_LONG\' 是小吃栏中的内置变量。我发布了我使用“LENGTH_LONG”变量和错误消息的位置。任何人请帮助我
\n\n jest "login"\r\n\r\n FAIL __tests__\\jest\\LoginScreen.test.js\r\n \xe2\x97\x8f Test suite failed to run\r\n\r\n TypeError: Cannot read property \'LENGTH_LONG\' of undefined\r\n\r\n 10 | ScrollView\r\n 11 | } from "react-native";\r\n > 12 | import Snackbar from \'react-native-snackbar\';\r\n 13 |\r\n 14 | import { connect } from "react-redux";\r\n 15 | import { Button, Text, Divider } from "react-native-elements";\r\n\r\n at Object.<anonymous> (node_modules/react-native-snackbar/lib/index.js:1:252)\r\n at Object.<anonymous> (src/screens/login/loginScreen.js:12:26)\r\n at Object.<anonymous> (__tests__/jest/LoginScreen.test.js:3:18)\r\n\r\nTest Suites: 1 failed, 1 total\r\nTests: 0 total\r\nSnapshots: 0 …