javascript - 如何在 Jasmine 中测试 Sequelize？

Question

我使用以下代码在 database/index.ts 文件中初始化一个 sequelize db:

import { Sequelize } from 'sequelize';

const {
  DATABASE_DIALECT,
  DATABASE_HOST,
  DATABASE_PORT,
  DATABASE_USER_NAME,
  DATABASE_USER_PASSWORD,
  DATABASE_NAME,
  ENVIRONMENT
} = process.env;

const sequelize = new Sequelize({
  host: DATABASE_HOST,
  port: +(DATABASE_PORT as string),
  dialect: DATABASE_DIALECT as 'postgres',
  database: DATABASE_NAME,
  username: DATABASE_USER_NAME,
  password: DATABASE_USER_PASSWORD,
  logging:
    (ENVIRONMENT as string) === 'production' || (ENVIRONMENT as string) === 'acceptance'
      ? false
      : console.log,
  query: {
    raw: true // Receive a plain object/array as a response from Sequelize (default response contains a lot of Sequelize metadata)
  }
});


export default sequelize;

我需要测试 logging 属性，因为它由检查 ENV 的三元运算符确定。
为了测试这一点，我需要检查调用了 new Sequelize(...) 的参数。
这如何在 Jasmine 中完成？我读了很多文章，看起来我们无法监视 Sequelize 类本身来检查调用参数。

Answer 1

我没有大量使用 Sequelize，但是传递给 logging 的值似乎最终在 sequelize.options.logging 下(基于 https://github.com/sequelize/sequelize/blob/main/lib/sequelize.js#L277 )。所以在测试中引用 sequelize.options.logging 可能是最快的方法。

另一种方法可能是将对象文字(传递给 Sequelize 构造函数)存储在变量中。然后导出变量(使其在测试中可用)并将变量传递给 Sequelize(以继续实例化)。就像是:

export const sequelizeOptions = {
  host: DATABASE_HOST,
  port: +(DATABASE_PORT as string),
  dialect: DATABASE_DIALECT as 'postgres',
  database: DATABASE_NAME,
  username: DATABASE_USER_NAME,
  password: DATABASE_USER_PASSWORD,
  logging:
    (ENVIRONMENT as string) === 'production' || (ENVIRONMENT as string) === 'acceptance'
      ? false
      : console.log,
  query: {
    raw: true // Receive a plain object/array as a response from Sequelize (default response contains a lot of Sequelize metadata)
  }
};

const sequelize = new Sequelize(sequelizeOptions);

export default sequelize;

从理论上讲，上述内容应该与您现在拥有的内容相同。它捕获和暴露对象的唯一区别。

另一种方法可能是在 console.log 周围创建一个薄包装器，以便您可以监视包装器 - 然后将包装器作为构造函数选项的一部分传递:

export const logger = (...args: any[]) => console.log(...args);

const sequelize = new Sequelize({
  host: DATABASE_HOST,
  port: +(DATABASE_PORT as string),
  dialect: DATABASE_DIALECT as 'postgres',
  database: DATABASE_NAME,
  username: DATABASE_USER_NAME,
  password: DATABASE_USER_PASSWORD,
  logging:
    (ENVIRONMENT as string) === 'production' || (ENVIRONMENT as string) === 'acceptance'
      ? false
      : logger,
  query: {
    raw: true // Receive a plain object/array as a response from Sequelize (default response contains a lot of Sequelize metadata)
  }
});