style: auto-fix lint violations from enhanced ruff rules

1 files changed, 4 insertions, 5 deletions

diff --git a/services/backtester/tests/test_engine.py b/services/backtester/tests/test_engine.py
index 4794e63..f789831 100644
--- a/services/backtester/tests/test_engine.py
+++ b/services/backtester/tests/test_engine.py
@@ -1,20 +1,19 @@
 """Tests for the BacktestEngine."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 from unittest.mock import MagicMock
 
-
-from shared.models import Candle, Signal, OrderSide
-
 from backtester.engine import BacktestEngine
 
+from shared.models import Candle, OrderSide, Signal
+
 
 def make_candle(symbol: str, price: float, timeframe: str = "1h") -> Candle:
     return Candle(
         symbol=symbol,
         timeframe=timeframe,
-        open_time=datetime.now(timezone.utc),
+        open_time=datetime.now(UTC),
         open=Decimal(str(price)),
         high=Decimal(str(price * 1.01)),
         low=Decimal(str(price * 0.99)),