old_contents: define(['pgp_mail/util'], function(util) {
      'use strict';
  
      describe('PGP Mail Utils', function () {
          it('should exist', function () {
              expect(util).to.be.defined;
          });
  
          describe('PGP mail detection (pgp/mime)', function () {
              it('should detect a signed PGP mail', function () {
                  var mail = {
                      content_type: 'multipart/signed'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.true;
              });
              it('should detect an encrypted PGP mail', function () {
                  var mail = {
                      content_type: 'multipart/encrypted'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.true;
              });
  
              it('should detect non-PGP mails', function () {
                  var mail = {
                      content_type: 'text/plain'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.false;
              });
          });
      });
  });
  
new_contents: define(['pgp_mail/util'], function(util) {
      'use strict';
  
      describe('PGP Mail Utils', function () {
          it('should exist', function () {
              expect(util).to.exist;
          });
  
          describe('PGP mail detection (pgp/mime)', function () {
              it('should detect a signed PGP mail', function () {
                  var mail = {
                      content_type: 'multipart/signed'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.true;
              });
              it('should detect an encrypted PGP mail', function () {
                  var mail = {
                      content_type: 'multipart/encrypted'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.true;
              });
  
              it('should detect non-PGP mails', function () {
                  var mail = {
                      content_type: 'text/plain'
                  };
  
                  expect(util.isPGPMail(mail)).to.be.false;
              });
          });
      });
  });
  
subject: fix existance test example for util class