testing on jsbin [mocha template] // source http://jsbin.com/kifeki

<!DOCTYPE html>
<html>
<head>
<meta name="description" content="[mocha template]">
  <meta charset="utf-8">
  <title>testing on jsbin</title>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.css">
</head>
<body>  
  <div id="mocha"></div>

mocha.setup('bdd');
    var expect = chai.expect;

describe('Test current conditional', function() {
                describe('When value null, it it set as mbid', function() {
                  it('The data to be sent should have property mbid', function() {
                    expect(test1(null)).to.have.property('mbid');
                  });
                  it('The data to be sent should NOT have property eid', function() {
                    expect(test1(null)).to.not.have.property('ebid');
                  });
                  it('Mbid is set to null', function() {
                    expect(test1(null).mbid).to.be.null;
                  });
                });
                describe('When value is an mbid, it it set as mbid', function() {
                  it('The data to be sent should have property mbid', function() {
                    expect(test1(testMbid)).to.have.property('mbid');
                  });
                  it('The data sent should NOT have property eid', function() {
                    expect(test1(testMbid)).to.not.have.property('ebid');
                  });
                  it('The length of mbid is 36', function() {
                    expect(test1(testMbid).mbid).to.have.lengthOf(36);
                  });
                });
               describe('When value is an eid, it it set as eid', function() {
                  it('The data to be sent should have property ebid', function() {
                    expect(test1(testEid)).to.have.property('eid');
                  });
                  it('The data sent should NOT have property mbid', function() {
                    expect(test1(testEid)).to.not.have.property('mbid');
                  });
                  it('The length of mbid is NOT 36', function() {
                    expect(test1(testEid).eid).to.not.have.lengthOf(36);
                  });
                });
         });
    
          describe('Test new conditional', function() {
                describe('When value null, it it set as mbid', function() {
                  it('The data to be sent should have property mbid', function() {
                    expect(test2(null)).to.have.property('mbid');
                  });
                  it('The data to be sent should NOT have property eid', function() {
                    expect(test2(null)).to.not.have.property('ebid');
                  });
                  it('Mbid is set to null', function() {
                    expect(test2(null).mbid).to.be.null;
                  });
                });
                describe('When value is an mbid, it it set as mbid', function() {
                  it('The data to be sent should have property mbid', function() {
                    expect(test2(testMbid)).to.have.property('mbid');
                  });
                  it('The data sent should NOT have property eid', function() {
                    expect(test2(testMbid)).to.not.have.property('ebid');
                  });
                  it('The length of mbid is 36', function() {
                    expect(test2(testMbid).mbid).to.have.lengthOf(36);
                  });
                });
               describe('When value is an eid, it it set as eid', function() {
                  it('The data to be sent should have property ebid', function() {
                    expect(test2(testEid)).to.have.property('eid');
                  });
                  it('The data sent should NOT have property mbid', function() {
                    expect(test2(testEid)).to.not.have.property('mbid');
                  });
                  it('The length of mbid is NOT 36', function() {
                    expect(test2(testEid).eid).to.not.have.lengthOf(36);
                  });
                });
         });
      
            describe('Test conditional to each other', function() {
                describe('When value null', function() {
                  it('data Object properties match', function() {
                    expect(test1(null).mbid).to.equal(test2(null).mbid);
                    expect(test1(null).eid).to.equal(test2(null).eid);
                  });
                });
                describe('When value is an mbid', function() {
                  it('data Object properties match', function() {
                  expect(test1(testMbid).mbid).to.equal(test2(testMbid).mbid);
                  expect(test1(testMbid).eid).to.equal(test2(testMbid).eid);                  });
                });
               describe('When value is an eid', function() {
                  it('data Object properties match', function() {
                  expect(test1(testEid).mbid).to.equal(test2(testEid).mbid);
                  expect(test1(testEid).eid).to.equal(test2(testEid).eid);                  });
                });
         });
    
    
    mocha.run();
  </script>
<script id="jsbin-javascript">
var testMbid = "218dfc9e-c77f-4469-80e1-1037b4483601";
var testEid = "01.1472232578.917805cc56ad4efdc3e1b971706df15eab3add359616a00634107760d57d19572b241af6443e55b92760032af0ebaeea017e1d017e3da5fa4ef2455a5d";

function cookieSize(value) {
  return encodeURIComponent('' + value).length;
}

function test1(value){
  data = {};
  cookieSize(value) == 36 ? data.mbid = value : (value == null) ? data.mbid = value : data.eid = value;
  return data;
}

function test2(value){
  data = {};
  ((cookieSize(value)==36) || (value == null))? data.mbid = value : data.eid = value;
  return data;
}

function resultMbid(){
  data = {};
  data.mbid = testMbid;
  return data;
}

function resultEid(){
  data = {};
  data.eid = testEid;
  return data
}
</script>

mocha.setup('bdd');
    var expect = chai.expect;

function cookieSize(value) {
  return encodeURIComponent('' + value).length;
}

function test1(value){
  data = {};
  cookieSize(value) == 36 ? data.mbid = value : (value == null) ? data.mbid = value : data.eid = value;
  return data;
}

function test2(value){
  data = {};
  ((cookieSize(value)==36) || (value == null))? data.mbid = value : data.eid = value;
  return data;
}

function resultMbid(){
  data = {};
  data.mbid = testMbid;
  return data;
}

function resultEid(){
  data = {};
  data.eid = testEid;
  return data
}

</script></body>
</html>

Modified http://cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.js to a secure url

Modified http://cdnjs.cloudflare.com/ajax/libs/chai/1.9.0/chai.js to a secure url

https://cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.js

https://cdnjs.cloudflare.com/ajax/libs/chai/1.9.0/chai.js

https://cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.js

https://cdnjs.cloudflare.com/ajax/libs/chai/1.9.0/chai.js