add unit test for dynamic community selection implementing #2158 logic

Author: Gaudy Blanco

tests/unit/query/context_builder/dynamic_community_selection.py

@@ -202,4 +202,4 @@ def test_dynamic_community_selection_handles_str_children():
         child_id = str(child)
         assert child_id in selector.reports, (
             f"Child {child} (as '{child_id}') should be found in reports"
-        )
+        )