refactored for easier testing

src/config.py

@@ -1,11 +1,12 @@
+import configparser
 import os
-from configparser import ConfigParser
+from configparser import ConfigParser, DuplicateSectionError
 
 
 class Config:
     parser: ConfigParser
 
-    def __init__(self):
+    def __init__(self, path: str = None, filename: str = "config.ini"):
         """
         Config parser reading config.ini
 
@@ -14,12 +15,18 @@ class Config:
             self.__filename: Path and name to the config file
         """
         self.parser = ConfigParser()
+        self.path = path
+        self.filename = filename
+
+        if self.path is None:
+            home_path = os.environ["HOME"]
+            full_path = os.path.join(home_path, ".config", "brovski-adress-etiketten" )
+        else:
+            full_path = self.path
 
-        home_path = os.environ["HOME"]
-        full_path = os.path.join(home_path, ".config", "brovski-adress-etiketten" )
         if not os.path.exists(full_path):
             os.makedirs(full_path)
-        self.config_file = os.path.join(full_path, "config.ini")
+        self.config_file = os.path.join(full_path, self.filename)
 
         self._load()
 
@@ -32,11 +39,15 @@ class Config:
 
     def add_section(self, section):
         self._load()
-        self.parser.add_section(section)
+        try:
+            self.parser.add_section(section)
+        except DuplicateSectionError:
+            pass
         self._save()
 
     def set(self, section: str, option: str, value: str):
         self._load()
+        self.add_section(section)
         self.parser.set(section, option, value)
         self._save()