jestjs - 类型错误 : Cannot read property 'LENGTH_LONG' of undefined

Question

我正在 React Native 中进行 Jest 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 snackbar 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。请大家帮帮我

 jest "login"

 FAIL  __tests__\jest\LoginScreen.test.js
  ● Test suite failed to run

    TypeError: Cannot read property 'LENGTH_LONG' of undefined

      10 |     ScrollView
      11 | } from "react-native";
    > 12 | import Snackbar from 'react-native-snackbar';
      13 |
      14 | import { connect } from "react-redux";
      15 | import { Button, Text, Divider } from "react-native-elements";

      at Object.<anonymous> (node_modules/react-native-snackbar/lib/index.js:1:252)
      at Object.<anonymous> (src/screens/login/loginScreen.js:12:26)
      at Object.<anonymous> (__tests__/jest/LoginScreen.test.js:3:18)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        2.689s, estimated 4s
Ran all test suites matching /login/i.

代码是

render() {
        return (
            <View style={styles.mainContainer}>
                {this.renderTopLogoContainer()}
                {this.renderBottomContainer()}

                {this.props.hasError ? Snackbar.show({
                    title: this.props.error.display_message,
                    duration: Snackbar.LENGTH_LONG
                }) : null}
            </View>
        );
    }

Answer 1

https://github.com/cooperka/react-native-snackbar/tree/master/example 在mocks文件夹中添加react-native-snackbar.js文件