static void Main(string[] args)
        {
            "Testing ItemEditor Package".title('=');
            WriteLine();

            Write("\n --- Test DBElement<int,string> ---");

            DBElement <int, string> elem1 = new DBElement <int, string>("Element-1", "Description of Element-1");

            elem1.payload = "Payload of element-1.";
            elem1.children.AddRange(new List <int> {
                9, 10, 11
            });
            DBElement <int, string> elem2 = new DBElement <int, string>("Element-2", "Description of Element-2");

            elem2.payload = "Payload of element-2.";
            DBElement <int, string> elem3 = new DBElement <int, string>("Element-3", "Description of Element-3");

            elem3.payload = "Payload of element-3.";

            DBEngine <int, DBElement <int, string> > db = new DBEngine <int, DBElement <int, string> >();

            db.insert(1, elem1);
            db.insert(2, elem2);
            db.insert(3, elem3);
            db.showDB();

            Write("\n\n  Going to test adding of relationship to DB-elements: Element-1 and Element-2");
            bool add1 = db.addRelation <int, DBElement <int, string>, string>(1, 2);
            bool add2 = db.addRelation <int, DBElement <int, string>, string>(2, 3);
            bool add3 = db.addRelation <int, DBElement <int, string>, string>(2, 17);

            //add3 will be equal to false because we cannot add a child key(17) if it is not present in the database.

            db.showDB();
            if (add1 && add2 && add3)
            {
                Write("\n  Adding relationship to all items successded.");
            }
            else
            {
                Write("\n  Adding relationship failed in one of the cases.");
            }

            Write("\n\n  Now going to test removing of relationship in DB-element: Element-1.");
            bool rem1 = db.removeRelation <int, DBElement <int, string>, string>(1, 10);
            bool rem2 = db.removeRelation <int, DBElement <int, string>, string>(1, 15);

            //The above case will fail because key-15 is not present in children list of Element-1.

            db.showDB();
            if (rem1 && rem2)
            {
                Write("\n  Deleting of relationship to both items successded.");
            }
            else
            {
                Write("\n  Deleting of relationship failed in one of the cases.");
            }


            Write("\n\n  Now going to test edition of name, description and replacing instance of payload with new instance in element1.");
            bool ed_name1 = db.editName <int, DBElement <int, string>, string>(1, "Elemen1_Renamed.");
            bool ed_descr = db.editDescr <int, DBElement <int, string>, string>(1, "New description for element 1.");
            bool ed_inst  = db.editInstance <int, DBElement <int, string>, string>(1, "New instance of payload for element-1.");

            db.showDB();

            Write("\n\n --- Test DBElement<string,List<string>> ---");
            DBElement <string, List <string> > new_elem1 = new DBElement <string, List <string> >("Element-One", "Description of Element-One");

            new_elem1.payload = new List <string> {
                "First string in payload of Element-One", "Second string in payload of Element-One", "Third string"
            };
            new_elem1.children.AddRange(new List <string> {
                "Nine", "Ten", "Eleven"
            });
            DBElement <string, List <string> > new_elem2 = new DBElement <string, List <string> >("Element-Two", "Description of Element-Two");

            new_elem2.payload = new List <string> {
                "First string in payload of Element-Two", "Mars", "Venus"
            };
            DBElement <string, List <string> > new_elem3 = new DBElement <string, List <string> >("Element-Three", "Description of Element-Three");

            new_elem3.payload = new List <string> {
                "First string in payload of element-3", "Beta", "Gamma"
            };

            DBEngine <string, DBElement <string, List <string> > > new_db = new DBEngine <string, DBElement <string, List <string> > >();

            new_db.insert("One", new_elem1);
            new_db.insert("Two", new_elem2);
            new_db.insert("Three", new_elem3);
            new_db.showEnumerableDB();

            Write("\n\n  Going to test adding of relationship to DB-elements: Element-One and Element-Two");
            bool a1 = new_db.addRelation <string, DBElement <string, List <string> >, List <string> >("One", "Two");
            bool a2 = new_db.addRelation <string, DBElement <string, List <string> >, List <string> >("Two", "Three");
            bool a3 = new_db.addRelation <string, DBElement <string, List <string> >, List <string> >("Three", "Not_presnet");

            //a3 will be false because we are trying to add a key that is not present in the database.

            new_db.showEnumerableDB();
            if (a1 && a2 && a3)
            {
                Write("\n  Adding relationship to all items successded.");
            }
            else
            {
                Write("\n  Adding relationship failed in one of the cases.");
            }


            Write("\n\n  Now going to test removing of relationships in DB-element: Element-One");
            bool r1 = new_db.removeRelation <string, DBElement <string, List <string> >, List <string> >("One", "Nine");
            bool r2 = new_db.removeRelation <string, DBElement <string, List <string> >, List <string> >("One", "Not_present");

            //r2 will be false because we are trying to remove a relationship in element one which is not even presnet.

            new_db.showEnumerableDB();
            if (r1 && r2)
            {
                Write("\n  Deleting of relationships successded in both cases.");
            }
            else
            {
                Write("\n  Deleting of relationship failed in one of the cases.");
            }


            Write("\n\n  Now going to test edition of name, description and replacing instance of payload with new instance in Element-One.");
            new_db.editName <string, DBElement <string, List <string> >, List <string> >("One", "Edited name for Element-One");
            new_db.editDescr <string, DBElement <string, List <string> >, List <string> >("One", "New description for Element-One");
            new_db.editInstance <string, DBElement <string, List <string> >, List <string> >("One", new List <string> {
                "New payload - String One", "New payload - String Two", "New payload - String Three"
            });
            new_db.showEnumerableDB();
            WriteLine();
        }