@Test
   public void testOrderedChecksFailsFast() {
      RentalCar rentalCar = new RentalCar("Morris", "DD-AB-123", 0);

      // This should not create a violation exception due to the 0 seat count failing first due to the GroupSequence on RentalCar
      rentalCar.setPassedVehicleInspection(false);

      Driver john = new Driver("John Doe");
      john.setAge(18);
      john.passedDrivingTest(true);
      rentalCar.setDriver(john);

      assertEquals(1, validator.validate(rentalCar).size());
      assertEquals(validator.validate(rentalCar).iterator().next()
            .getPropertyPath().toString(), "seatCount");

      rentalCar.setSeatCount(4);
      assertEquals(1, validator.validate(rentalCar).size());
      assertEquals(validator.validate(rentalCar).iterator().next()
            .getPropertyPath().toString(), "passedVehicleInspection");
   }
   
   @Test
   public void testSubclassesInheritGroupSequence() {
      //Our assertion here is based around Item C from Section 3.4.5 of the JSR 303 Validation Spec
      //that class X (MiniRentalCar) without explicitly defining a Default group would then inherit
      //it's superclasse's "Default" constraints along with  it's own attribute level constraints
      //not explicitly tied to a group other than Default.
      class MiniRentalCar extends RentalCar{
         public MiniRentalCar(String manufacturer, String licencePlate, int seatCount) {
            super( manufacturer, licencePlate, seatCount );
         }
      }
      
      MiniRentalCar miniRentalCar = new MiniRentalCar("Morris", "DD-AB-123", 0);

      // This should not create a violation exception due to the 0 seat count.
      miniRentalCar.setPassedVehicleInspection(false);

      Driver john = new Driver("John Doe");
      john.setAge(18);
      john.passedDrivingTest(true);
      miniRentalCar.setDriver(john);

      assertEquals(1, validator.validate(miniRentalCar).size());
      assertEquals(validator.validate(miniRentalCar).iterator().next()
            .getPropertyPath().toString(), "seatCount");

      miniRentalCar.setSeatCount(4);
      assertEquals(1, validator.validate(miniRentalCar).size());
      assertEquals(validator.validate(miniRentalCar).iterator().next()
            .getPropertyPath().toString(), "passedVehicleInspection");
   }
   
   @Test
   public void testExplicitGroupSequenceOnSubclass(){
      //With the testSubclassesInheritGroupSequence test failing, we then try
      //a similar test case whereby we explicitly set the Default group for this class.
      @GroupSequence({ AnotherMiniRentalCar.class, CarChecks.class })
      class AnotherMiniRentalCar extends RentalCar{
         public AnotherMiniRentalCar(String manufacturer, String licencePlate, int seatCount) {
            super( manufacturer, licencePlate, seatCount );
         }
      }
      
      AnotherMiniRentalCar anotherMiniRentalCar = new AnotherMiniRentalCar("Morris", "DD-AB-123", 0);

      // This should not create a violation exception due to the 0 seat count.
      anotherMiniRentalCar.setPassedVehicleInspection(false);

      Driver john = new Driver("John Doe");
      john.setAge(18);
      john.passedDrivingTest(true);
      anotherMiniRentalCar.setDriver(john);

      assertEquals(1, validator.validate(anotherMiniRentalCar).size());
      assertEquals(validator.validate(anotherMiniRentalCar).iterator().next()
            .getPropertyPath().toString(), "seatCount");

      anotherMiniRentalCar.setSeatCount(4);
      assertEquals(1, validator.validate(anotherMiniRentalCar).size());
      assertEquals(validator.validate(anotherMiniRentalCar).iterator().next()
            .getPropertyPath().toString(), "passedVehicleInspection");
   }