text: //load chai assertion library
  const chai = require("chai");
  const expect = chai.expect;
  const asserttype = require('chai-asserttype');
  chai.use(asserttype);
  
  
  //load calculator code
  var Calculator = require("../Calculator");
  var calc = new Calculator();
  
  describe("Calculator Tests",function(){
   
    it("Adds 1 and 2",function(){
  	expect(calc.add(1,2)).to.be.equal(3);
    });
  
  
   it("Add Allows no parameters",function(){
     expect(calc.add()).to.be.equal(0);
   });
  
   it("Add turns strings to zeros",function(){
     expect(calc.add("frog","toad")).to.be.number();
   });
  
  
  
  });
  