added belongs-to-eager test

test/models/model_metas.hpp

@@ -11,5 +11,9 @@ META_TABLE(flights, FLIGHT, id, airplane_id, pilot_name);
 META_TABLE(shipments, SHIPMENT, id, tracking_number)
 META_TABLE(packages, PACKAGE, id, weight, shipment_id)
 META_TABLE(persons, PERSON, id, name, age, image)
+META_TABLE(departments, DEPARTMENT, id, name)
+META_TABLE(employees, EMPLOYEE, id, first_name, last_name, dep_id)
+META_TABLE(authors, AUTHOR, id, first_name, last_name, date_of_birth, year_of_birth, distinguished)
+META_TABLE(books, BOOK, id, title, author_id, published_in)
 
 #endif //MATADOR_MODEL_METAS_HPP