tests: Clean up test

Author: pawamoy

tests/test_handler.py

@@ -160,9 +160,6 @@ def function(self):
         """,
     )
     with temporary_visited_module(code) as module:
-        # TODO: Remove once Griffe does that automatically.
-        module.lines_collection[module.filepath] = code.splitlines()  # type: ignore[index]
-
         module["Class"].lineno = None
         module["Class.function"].lineno = None
         module["attribute"].lineno = None