如何在Nodejs中为winston logger编写单元测试

npm install winston mocha --save-dev

const winston = require('winston');
const assert = require('assert');

describe('Logger', function() {
  it('should write logs to a file', function() {
    // 创建一个winston logger实例
    const logger = winston.createLogger({
      transports: [
        new winston.transports.File({ filename: 'logs.log' })
      ]
    });

    // 执行需要测试的代码
    logger.info('This is a test log message');

    // 验证日志是否正确地写入文件
    const logs = fs.readFileSync('logs.log', 'utf8');
    assert.ok(logs.includes('This is a test log message'));
  });
});

npx mocha logger.test.js