anchor.diff:  ----
   ConstraintViolation<Customer> violation = ...;
   
  -assertThat( violation.getPropertyPath.toString() ).isEqualTo( "orderQuantitiesByType[RETAIL].<map value>" );
  -
   Iterator<Node> path = violation.getPropertyPath().iterator();
   
   Node node = path.next();
  
positive.code: [source,java]
  ----
  ConstraintViolation<Customer> violation = ...;
  
  assertThat( violation.getPropertyPath.toString() ).isEqualTo( "ordersByType[RETAIL].description" );
  
  Iterator<Node> path = violation.getPropertyPath().iterator();
  
  
negative.code: 		this.columnKey = columnKey;
  	}
  
  	// equals(), hashCode() ...
  }
  ----
  