text: 
  const chai = require('chai'), expect = chai.expect;
  chai.use(require('chai-like'));
  chai.use(require('chai-things'));
  
  const Text = require('../../../manipulator/text');
  
  describe('isValidYoutubeUrl method', function() {
    
    before(function() {
      
    });
  
    after(function() {
      
    });
  
    beforeEach(function() {
      
    });
  
    afterEach(async function() {
      
    });
  
    it('should fail when url is invalid', async function() {
  
      expect(function() { 
        Text.isValidYoutubeUrl(null);
      }).to.throw('Invalid url');
    });
  
    it('should success with invalid status', async function() {
      const isValid = Text.isValidYoutubeUrl('not_valid-');
  
      expect(isValid).to.equal(false);
    });
  
    it('should success with valid status', async function() {
      const isValid = Text.isValidYoutubeUrl('https://www.youtube.com/watch?v=Dgmmje5WHWA');
  
      expect(isValid).to.equal(true);
    });
  
  });