在 jest.js 中无法识别编码

Question

我在使用 node-mysql2、react、sequelize 和 jest 测试项目时遇到问题。此问题仅在测试期间出现。

Encoding not recognized: 'cesu8' (searched as: 'cesu8')
    at Object.getCodec (project/node_modules/mysql2/node_modules/iconv-lite/lib/index.js:106:23)
    at Object.getDecoder (project/node_modules/mysql2/node_modules/iconv-lite/lib/index.js:122:23)
    at Object.<anonymous>.exports.decode (project/node_modules/mysql2/lib/parsers/string.js:9:23)
    at Packet.Object.<anonymous>.Packet.readNullTerminatedString (project/node_modules/mysql2/lib/packets/packet.js:373:23)
    at Function.Object.<anonymous>.Handshake.fromPacket (project/node_modules/mysql2/lib/packets/handshake.js:18:31)
    at ClientHandshake.Object.<anonymous>.ClientHandshake.handshakeInit (project/node_modules/mysql2/lib/commands/client_handshake.js:98:38)
    at ClientHandshake.Object.<anonymous>.Command.execute (project/node_modules/mysql2/lib/commands/command.js:40:20)
    at Connection.Object.<anonymous>.Connection.handlePacket (project/node_modules/mysql2/lib/connection.js:515:28)
    at PacketParser.onPacket (project/node_modules/mysql2/lib/connection.js:94:16)
    at PacketParser.executeStart (project/node_modules/mysql2/lib/packet_parser.js:77:14)
    at Socket.<anonymous> (project/node_modules/mysql2/lib/connection.js:102:29)

Answer 1

这是由 mysql2 执行编码的动态惰性要求而 Jest 无法处理此问题引起的。查看用户建议的一些解决方法 here:

将此代码段添加到 setupTestFrameworkScriptFile

require('mysql2/node_modules/iconv-lite').encodingExists('foo');

或者在你的代码早期的某个地方：

import iconv from 'iconv-lite';
import encodings from 'iconv-lite/encodings';
iconv.encodings = encodings;

Answer 2

真的只需要加上：

require('iconv-lite').encodingExists('foo')

到您正在测试的任何文件的顶部，例如 factory.test.js

不确定为什么会这样，但上面的内容比所选答案更适合复制/粘贴。

Answer 3

我遇到了与 network 节点模块类似的问题。我通过模拟 network 模块而不使用 iconv-lite 来解决问题。以下是我的代码。

jest.mock('network', () => ({
  get_active_interface: cb => {
    cb?.(undefined, { type: 'Wired' });
  },
}));

至于这种情况，也许您可以尝试 mock 进行调用的模块，像这样的代码。

jest.mock('mysql2',()=>({
    someFuncThatCallsIcoveLite:(..._)=>{} 
}))

在 jest.js 中无法识别编码

Encoding not recognized in jest.js

node.js

jestjs

node-mysql2