constants: allow custom db to be loaded

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>

Author: priv-kweihmann

oelint_parser/constants.py

@@ -10,8 +10,8 @@
 class Constants():
     """Interface for constants"""
 
-    def __init__(self) -> None:
-        self.__db = self.__load_db(DEFAULT_DB)
+    def __init__(self, file_: str = DEFAULT_DB) -> None:
+        self.__db = self.__load_db(file_)
 
     def __load_db(self, path: str) -> dict:
         try: