let mod=require('../math');
const chai=require('chai');
const sinon=require('sinon')



//Testing doDivision
describe('doDivision(a,b)', function () {
    it('Should return correct result', function () {
      a=5;
      b=6;
      var div=mod.doDivision(a,b).toFixed(2);
      chai.expect(div).to.equal((a/b).toFixed(2));
    });


});

//Fail case dividing by string
describe('doDivision(a,b)', function () {
  it('Should return error when wrong type is inserted', function () {
    chai.expect(function() { doDivision(4/'4'); }).to.throw(Error);
  });

});



//Corner case dividing by infinity
describe('doDivision(a,b)', function () {
  it('dividing by infinity should be zero', function () {
    var bang=mod.doDivision(4,Infinity);
    chai.expect(bang).to.equal(0);
  });


});

//part 2 stringifydivision test

describe('stringifyDivision(a,b)', function () {
  beforeEach(() => {
    var a=4
    var b=5
    var divisionFake=sinon.fake.returns(a/b);
    sinon.replace(mod, 'doDivision',divisionFake);
  });
    it('Should return correct result', function () {
      a=4;
      b=5;
      var sDivision=mod.stringifyDivision(a,b);
      chai.expect(sDivision).to.equal(a+' '+'divided by'+' '+b+' '+ 'is'+' '+a/b);
    });

  });