Fix lint issues in test_flow.py

- Add ValidationError import from pydantic
- Use ValidationError instead of generic Exception in test
- Remove unused flow variable
- Apply ruff formatting (import ordering and getattr simplification)

Co-Authored-By: João <joao@crewai.com>

tests/test_flow.py

@@ -4,17 +4,17 @@ import asyncio
 from datetime import datetime
 
 import pytest
-from pydantic import BaseModel
+from pydantic import BaseModel, ValidationError
 
-from crewai.flow.flow import Flow, and_, listen, or_, router, start
 from crewai.events.event_bus import crewai_event_bus
 from crewai.events.types.flow_events import (
     FlowFinishedEvent,
-    FlowStartedEvent,
     FlowPlotEvent,
+    FlowStartedEvent,
     MethodExecutionFinishedEvent,
     MethodExecutionStartedEvent,
 )
+from crewai.flow.flow import Flow, and_, listen, or_, router, start
 
 
 def test_simple_sequential_flow():
@@ -679,11 +679,11 @@ def test_structured_flow_event_emission():
     assert isinstance(received_events[3], MethodExecutionStartedEvent)
     assert received_events[3].method_name == "send_welcome_message"
     assert received_events[3].params == {}
-    assert getattr(received_events[3].state, "sent") is False
+    assert received_events[3].state.sent is False
 
     assert isinstance(received_events[4], MethodExecutionFinishedEvent)
     assert received_events[4].method_name == "send_welcome_message"
-    assert getattr(received_events[4].state, "sent") is True
+    assert received_events[4].state.sent is True
     assert received_events[4].result == "Welcome, Anakin!"
 
     assert isinstance(received_events[5], FlowFinishedEvent)
@@ -930,8 +930,8 @@ def test_flow_init_with_required_fields_missing_values():
         def step_1(self):
             pass
 
-    with pytest.raises(Exception):
-        flow = RequiredFieldsFlow()
+    with pytest.raises(ValidationError):
+        RequiredFieldsFlow()
 
 
 def test_flow_init_with_mixed_required_optional_fields():