用户单元测试总是在Null，Undefined，True和False的情况下通过

Question

我正在使用Jest对Nodejs用户模型进行单元测试。这是模型的代码：

const jwt = require('jsonwebtoken');
const config = require('config');
const moment = require('moment');
const Joi = require('joi');
const Sql = require('sequelize');
const db = require("../startup/db");

const User = db.define('user', {
    id: {type: Sql.INTEGER,
         primaryKey:true,
         min: 1},
    name: {type: Sql.STRING,
           allowNull: false,
           min: 2,
           max: 50,
    },
    email: {type: Sql.STRING,
            isEmail: true
    },      
    cell: {type: Sql.STRING,
            allowNull: false,
            unique:true,  //cell number is universally unique 
            min: 10,
            max: 20,
    },
    cell_country_code: {type: Sql.STRING,
    },
    customer_id: {type: Sql.INTEGER,
                  allowNull: false,
    },
    role: {type: Sql.STRING},
    last_updated_by_id: {type: Sql.INTEGER},
    fort_token: {type: Sql.STRING,
                 allowNull: false,
    },
    createdAt: Sql.DATE,
    updatedAt: Sql.DATE
  }, {
    validate: {async custom_validate() {
      let user = await User.findOne({where:{name :req.body.name, fort_token: session('fort_token')}});
      if (user) return res.status(400).send("用户重名！");

    }
  }
});

function validateUser(user) {
    const schema = {
        name: Joi.string()
        .min(2)
        .max(50)
        .required()
        .trim(),
    cell: Joi.string()
        .min(10)
        .max(20)
        .trim()
        .required()
        .error(new Error('该手机号有误！')),
    email: Joi.string()
        .min(5)
        .max(255)
        .email()
        .error(new Error('邮件地址格式不对！'))
        .trim(),
    customer_id: Joi.integer()
        .required(),
    fort_token: Joi.string()
        .required(),
    };

    return Joi.validate(user, schema);
};

这是测试用例。如果fort_token不同，用户可以拥有重复的名称：

const {User} = require('../../../models/user');
const moment = require('moment');
const jwt = require('jsonwebtoken');
const config = require('config');
const Sql = require("sequelize");

describe('User model should be sound', () => {
    let name = 'john doe';
    let customer_id = 1;
    let cell = '1234567890';
    let fort_token = '12349596874567678906';
    let role = 'admin';
    let expire_datetime =  moment().add(24, 'hours');
    let email = '[email protected]';

    let payload = () =>{ 
        return {
          customer_id: customer_id,
          name:  name,
          cell: cell,
          email: email,
          expire_datetime: expire_datetime,
          role: role,
          fort_token: fort_token
        }};

     it('should allow duplicate name with different fort token and cell', () => {
        let user = new User(payload());
        name = user.name;
        cell = user.cell + '1';
        fort_token = user.fort_token + '1';
        let user1 = new User(payload());
        expect(user1).toBeNull; 
   });

单元测试通过绿色。我尝试用以下测试：

expect(user1).toBeTruthy;
expect(user1).toBeFalsy;
expect(user1).toBeUndefined;

令我惊讶的是，所有的传球都是绿色的。我不太明白为什么user1对象可能同时是所有truthy, falsy, Null and Undefined！或者我应该使用toHaveProperty()来测试对象？

Answer 1

我认为为了获得预期的结果，您应该使用以下代码：

expect(user1).to.be.true
expect(user1).to.be.false
expect(user1).to.be.undefined

你应该看看官方的qazxsw poi