升级到Expo48后遇到此错误：TypeError: Cannot read properties of undefined (reading 'exists')

Question

将我的项目从Expo45升级到Expo48后，我在运行测试时遇到此错误：

TypeError: Cannot read properties of undefined (reading 'exists')
at exists (node_modules/expo-asset/src/PlatformUtils.ts:65:17)  
at asyncGeneratorStep (node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)  
at _next (node_modules/@babel/runtime/helpers/asyncToGenerator.js:22:9)

单元测试本身非常简单：

  it('Should be able rendered properly', () => {
    render(
      <UserContext.Provider
        value={[initialState, jest.fn()]}
      >
        <UpdatePasswordScreen />
      </UserContext.Provider>,
    );
  });

UpdatePasswordScreen 组件是这样的：

    <View style={styles.container}>
      <Spinner
        visible={showSpinner}
        textContent={'Loading...'}
        textStyle={{
          color: '#FFFFFF',
        }}
      />
      <CustomInput
        titleStyle={{
          size: 13,
        }}
        titleContainerStyle={{
          marginBottom: 10,
        }}
        containerStyle={{
          marginBottom: 8,
        }}
        placeholder="Enter Password"
        title="Old password"
        value={oldPassword}
        secureTextEntry={!showOldPassword}
        onRenderLeftIcon={() => (
          <Icon
            name={showOldPassword ? 'eye' : 'eye-off'}
            type="feather"
            size={20}
            color="#AFB4B9"
            onPress={() => setShowOldPassword(!showOldPassword)}
          />
        )}
        onChangeText={setOldPassword}
      />
      <View style={styles.confirmButton}>
        <IconButton
          text="Reset Password"
          buttonStyle={{
            height: 52,
            width: 200,
          }}
          onPress={updatePassword}
          disabled={!oldPassword || !newPassword
            || !confirmNewPassword || showPasswordErrorMessage()
            || newPassword !== confirmNewPassword
            || oldPasswordUnchanged
          }
        />
      </View>
    </View>

我只想渲染组件，但它不起作用。单元测试在Expo45下运行良好。

任何建议将不胜感激！

如何解决这个问题呢？

Answer 1

我通过将这些行添加到我的笑话设置文件中来修复此错误：

jest.mock("expo-font");
jest.mock("expo-asset");