这是我的config.json文件：

{
  "development": {
    "username": "xyz",
    "password": "password123",
    "database": "db1",
    "host": "localhost",
    "dialect": "postgres"
  },
  "test": {
    "username": "root",
    "password": null,
    "database": "database_test",
    "host": "127.0.0.1",
    "dialect": "mysql"
  },
  "production": {
    "username": "root",
    "password": null,
    "database": "database_production",
    "host": "127.0.0.1",
    "dialect": "mysql"
  }
}

这是我的app.js文件

const useit = async () => {
    await sequelize.authenticate();
}
//Listening 
app.listen({ port: 8000 }, async () => {
  console.log('Server up on http://localhost:8000')
  useit();
  console.log('Database Connected!')
  await sequelize.sync({alter:true});
  
})

module.exports = app;

在ORM中，我使用Sequalize沿着postgres作为我的后端。一切都很好，我所有的REST API端点都很好，但是，当我运行npm run test时，我收到了以下错误：

console.warn
    failed to find WebSocket

      at $.send (eval at oo_cm (app.js:386:57), <anonymous>:1:5120)

  console.warn
    failed to find WebSocket

      at $.send (eval at oo_cm (app.js:386:57), <anonymous>:1:5120)

 FAIL  test/app.test.js
  ✕ GET random not found endpoint (33 ms)

  ● GET random not found endpoint

    SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306

      at Client._connectionCallback (node_modules/sequelize/src/dialects/postgres/connection-manager.js:179:24)
      at Client._handleErrorWhileConnecting (node_modules/pg/lib/client.js:316:19)
      at Client._handleErrorEvent (node_modules/pg/lib/client.js:326:19)
      at Socket.reportStreamError (node_modules/pg/lib/connection.js:57:12)

  ● GET random not found endpoint

    SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306

      at Client._connectionCallback (node_modules/sequelize/src/dialects/postgres/connection-manager.js:179:24)
      at Client._handleErrorWhileConnecting (node_modules/pg/lib/client.js:316:19)
      at Client._handleErrorEvent (node_modules/pg/lib/client.js:326:19)
      at Socket.reportStreamError (node_modules/pg/lib/connection.js:57:12)

我不知道整个代码的问题是什么。试图改变配置文件和app.js里面的东西，但没有工作。我的测试用例总是失败与相同的错误。请帮助我。