fix error

Author: rochi88

comprehensive_test.py

@@ -239,7 +239,7 @@ class TestBDShareClient:
     """Tests for the BDShare class and its methods."""
 
     def test_instantiation(self):
-        bd = BDShare()
+        bd = bdshare.BDShare()
         assert bd is not None
 
     def test_context_manager(self):

tests/test_trading.py

@@ -299,6 +299,8 @@ def test_data_integration(self):
         # Get DSEX data
         dsex_df = get_dsex_data()
         self.assertIsInstance(dsex_df, pd.DataFrame)
+
+        df = None
 
         # Get historical data for a symbol from current data
         if not current_df.empty and 'trading_code' in current_df.columns: