link spec in strapi tutorial

link.spec.js

const { expect } = require('chai');

describe('strapi.services.link', () => {
  describe('#create', () => {
    context('with invalid data', () => {
      it('should fails', async () => {
        try { 
          await strapi.services.link.create({
            name: "invalid",
            url: 'invalid-url-formt'
          })
        } catch(err) {
          expect(err.message).to.be.eqls(
            'url field should be a valid url'
          )
        }
      })
    })
    context('with valid data', () => {
      it('should create', async () => {
        const pageContent = await strapi.services.link.create({
          name: "invalid",
          url: 'https://valid.url.format'
        })
        expect(pageContent).to.be.not.null
     })
    })
  })
})