摩卡柴期待。 如何验证 class 是否存在？

Question

As the title mentioned. I would like to ask that how could i write the test code for this scenario?

Example... i have a class look like this.

let ABC = function()
{
    this.title="sample"
};

Question is how do i use chai expect to check for the existences of ABC class?

Does expect chai do something like this? Expect(ABC).to.be.a.class

Answer 1

I'm not sure if you had this answered yet but I had the same question and I just found out

• so after requiring chai and the expect API

• and after requiring the file where your class resides and setting up your test

• you can ensure that:

  • 1. it is a function with .to.be.a('function');
  • 2. check that it is an instance of your class with expect(className).to.be.an.instance.of(ClassName);

   const expect = chai.expect; const Card = require('../src/Card'); describe('Card', function() { it.skip('should be a function', function() { const card = new Card(); expect(Card).to.be.a('function'); }); it.skip('should be an instance of Card', function() { const card = new Card(); expect(card).to.be.an.instanceof(Card); });```