node.js – 使用Sequelize构建,播种和销毁PostgreSQL以进行测试

我正在尝试自动化为每个测试构建,播种和销毁的数据库.我正在使用PostgreSQL,Mocha和Sequelize.

我找到了一个库：sequelize-fixtures让我分道扬but,但最终它非常不一致,偶尔会抛出约束错误：未处理的拒绝SequelizeUniqueConstraintError：验证错误,即使我没有对模型进行任何验证.

这是我如何进行测试

const sequelize = new Sequelize('test_db', 'db', null, {
  logging: false,
  host: 'localhost',
  port: '5432',
  dialect: 'postgres',
  protocol: 'postgres'
})

describe('/auth/whoami', () => {
  beforeEach((done) => {
    Fixtures.loadFile('test/fixtures/data.json', models)
      .then(function(){
         done()
      })
  })

  afterEach((done) => {
    sequelize.sync({
      force: true
    }).then(() => {
      done()
    })
  })

  it('should connect to the DB', (done) => {
    sequelize.authenticate()
      .then((err) => {
        expect(err).toBe(undefined)
        done()
      })
  })

  it('should test getting a user', (done) => {
    models.User.findAll({
      attributes: ['username'],
    }).then((users) => {
      users.forEach((user) => {
        console.log(user.password)
      })
      done()
    })
  })
})

我的模型定义如下：

var Sequelize = require('sequelize'),
    db = require('./../utils/db')

var User = db.define('User', {
  username: {
    type: Sequelize.STRING(20),
    allowNull: false,
    notEmpty: true
  },
  password: {
    type: Sequelize.STRING(60),
    allowNull: false,
    notEmpty: true
  }
})

module.exports = User

错误日志：

Fixtures: reading file test/fixtures/data.json...
Executing (default): CREATE TABLE IF NOT EXISTS "Users" ("id"   SERIAL , "username" VARCHAR(20) NOT NULL, "password" VARCHAR(60) NOT NULL, "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL, "updatedAt" TIMESTAMP WITH TIME ZONE NOT NULL, PRIMARY KEY ("id"));
Executing (default): SELECT "id", "username", "password", "createdAt", "updatedAt" FROM "Users" AS "User" WHERE "User"."id" = 1 AND "User"."username" = 'Test User 1' AND "User"."password" = 'testpassword';
Executing (default): SELECT i.relname AS name, ix.indisprimary AS primary, ix.indisunique AS unique, ix.indkey AS indkey, array_agg(a.attnum) as column_indexes, array_agg(a.attname) AS column_names, pg_get_indexdef(ix.indexrelid) AS definition FROM pg_class t, pg_class i, pg_index ix, pg_attribute a WHERE t.oid = ix.indrelid AND i.oid = ix.indexrelid AND a.attrelid = t.oid AND t.relkind = 'r' and t.relname = 'Users' GROUP BY i.relname, ix.indexrelid, ix.indisprimary, ix.indisunique, ix.indkey ORDER BY i.relname;
Executing (default): INSERT INTO "Users" ("id","username","password","createdAt","updatedAt") VALUES (1,'Test User 1','testpassword','2016-04-29 23:15:08.828 +00:00','2016-04-29 23:15:08.828 +00:00') RETURNING *;
Unhandled rejection SequelizeUniqueConstraintError: Validation error

这工作一次,然后再也没有.对于我来说,在每次测试之前,是否有更强大的方法,从一个完全干净的DB开始,我可以填写测试数据进行操作？

This is the closest I have come to finding any kind of discussion/answer.

另外,如果有人也知道为什么我仍然得到console.logs()即使我有记录：false on,那将不胜感激.

您粘贴的错误似乎表明多次插入相同的数据,导致id列发生冲突.

我希望调用sequelize.sync({force：true})会在每次运行时为你清除所有数据库表,但似乎并非如此.您可以尝试将调用移动到beforeEach挂钩,以确保运行的第一个测试也具有新的数据库.

在我正在处理的应用程序上,我们不会为每个测试重新同步数据库,而是在开始时执行一次并在测试之间截断表.我们使用如下所示的清理函数：

function cleanup() {
    return User.destroy({ truncate: true, cascade: true });
}

create方法执行从json fixture加载数据并将它们插入数据库的工作.

function create() {
    var users = require('./fixtures/user.json');
    return User.bulkCreate(users);
}

您可以通过省略sequelize-fixture并自行处理来简化依赖关系并提高稳定性.

另外,一个不相关的建议：Sequelize的方法返回Mocha可以原生处理的承诺,因此不需要在测试和设置/拆除代码中使用完成回调：

it('should connect to the DB', () => {
   return sequelize.authenticate()
 })

如果承诺被拒绝,测试将失败.

此外,Mocha’s docs目前建议不要使用箭头功能：

Passing arrow functions to Mocha is discouraged. Their lexical binding of the this value makes them unable to access the Mocha context, and statements like this.timeout(1000); will not work inside an arrow function.