code: function (value1, value2, optMsg, optAssertId) {
                  var msg = optMsg || ("First and second value shouldn't be equal but they are both equal to: " + value1);
                  this.assertTrue((value1 !== value2), msg);
              }
docs: AssertNotEquals: Check that value1 is not! equal to value2
  @param {object} value1 the value to compare
  @param {object} value2 the value to compare
  @param {String} optMsg optional message to add to the failure description
  @param {String} optAssertId optional ID to quickly locate the failed assertion (in case of many
  assertions with the same, or default, message). Could be e.g. a line where the assertion is put at
  creation time.