#2 Added ability for user to login as seller and added test to verify functionality

controllers/database/database.py

@@ -26,6 +26,10 @@ class DatabaseController(ABC):
                 self._conn.close()
             print(e)
 
+    def __del__(self):
+          if self._conn != None:
+            self._conn.close()
+
     """ Takes a dictionary of fields and returns the object 
         with those fields populated """
     def new_instance(self, of: type, with_fields: Mapping[str, Any]):