Fix tests

src/crewai/pipeline/pipeline.py

@@ -142,21 +142,22 @@ class Pipeline(BaseModel):
         """
         initial_input = copy.deepcopy(kickoff_input)
         current_input = copy.deepcopy(kickoff_input)
+        stages = copy.deepcopy(self.stages)
         pipeline_usage_metrics: Dict[str, UsageMetrics] = {}
         all_stage_outputs: List[List[CrewOutput]] = []
         traces: List[List[Union[str, Dict[str, Any]]]] = [[initial_input]]
 
         stage_index = 0
-        while stage_index < len(self.stages):
-            stage = self.stages[stage_index]
+        while stage_index < len(stages):
+            stage = stages[stage_index]
             stage_input = copy.deepcopy(current_input)
 
             if isinstance(stage, Router):
                 next_pipeline, route_taken = stage.route(stage_input)
-                self.stages = (
-                    self.stages[: stage_index + 1]
+                stages = (
+                    stages[: stage_index + 1]
                     + list(next_pipeline.stages)
-                    + self.stages[stage_index + 1 :]
+                    + stages[stage_index + 1 :]
                 )
                 traces.append([{"route_taken": route_taken}])
                 stage_index += 1

src/crewai/routers/router.py

@@ -1,4 +1,3 @@
-import logging
 from dataclasses import dataclass
 from typing import Any, Callable, Dict, Generic, Tuple, TypeVar