Add __get_library_path function

ugrid/ugrid.py

@@ -44,25 +44,29 @@ def __init__(self, file_path, method):
             OSError: This gets raised in case UGrid is used within an unsupported OS.
         """
 
-        # Determine OS
+        lib_path = self.__get_library_path()
+        self.lib = CDLL(str(lib_path))
+        self.__open(file_path, method)
+
+    def __enter__(self):
+        return self
+
+    def __get_library_path(self):
+        """Gets the library path
+
+        Raises:
+            OSError: This gets raised in case UGrid is used within an unsupported OS.
+        """
         system = platform.system()
         lib_path = Path(__file__).parent
         if system == "Windows":
             lib_path = os.path.join(lib_path, "UGridApi.dll")
-        elif system == "Linux":
-            lib_path = os.path.join(lib_path, "UGridApi.so")
-        elif system == "Darwin":
-            lib_path = os.path.join(lib_path, "UGridApi.dylib")
         else:
             if not system:
                 system = "Unknown OS"
             raise OSError(f"Unsupported operating system: {system}")
 
-        self.lib = CDLL(str(lib_path))
-        self.__open(file_path, method)
-
-    def __enter__(self):
-        return self
+        return lib_path
 
     def __exit__(self, type, value, traceback):
         self.__execute_function(self.lib.ug_file_close, self._file_id)