text: const expect = require('chai').expect;
  const number = require('../src/number');
  
  describe('number', function () {
      
      describe('#isNum(value)', function () {
          it('should return false when the value is undefined', function () {
              const value = undefined;
              expect(number.isNum(value)).to.be.false;
          })
  
          it('should return false when the value is string', function () {
              const value = '1';
              expect(number.isNum(value)).to.be.false;
          })
  
          it('should return false when the value is bool', function () {
              const value = true;
              expect(number.isNum(value)).to.be.false;
          })
  
          it('should return true when the value is number', function () {
              const value = 1;
              expect(number.isNum(value)).to.be.true;
          })
      })
  })