assertFalse( constraint.isValid( "10", null ) );
assertFalse( constraint.isValid( "14.99", null ) );
assertFalse( constraint.isValid( "-14.99", null ) );
// HV-502
assertTrue( constraint.isValid( new MyCustomStringImpl( "20" ), null ) );
//number format exception
assertFalse( constraint.isValid( "15l", null ) );
}