diff --git a/tests/conftest.py b/tests/conftest.py
index 3b279e93..b283ec00 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -35,6 +35,7 @@ def sample_config():
 
 class MockResult:
     """Mock result that always has proper tool_calls attribute."""
+
     def __init__(self, content="Test response", tool_calls=None):
         self.content = content
         self.tool_calls = tool_calls if tool_calls is not None else []
@@ -52,17 +53,17 @@ def mock_llm():
     # Simple approach: create a mock that will be returned by any chain operation
     chain_result = Mock()
     chain_result.return_value = default_result
-    
+
     # Mock the bind_tools to return a mock that handles piping
     bound_mock = Mock()
     bound_mock.invoke = Mock(return_value=default_result)
-    
+
     # Handle the pipe operation by returning a mock that also returns our result
     def handle_pipe(other):
-        pipe_result = Mock()  
+        pipe_result = Mock()
         pipe_result.invoke = Mock(return_value=default_result)
         return pipe_result
-    
+
     bound_mock.__ror__ = handle_pipe
     mock.bind_tools.return_value = bound_mock
 
diff --git a/tests/unit/agents/test_market_analyst.py b/tests/unit/agents/test_market_analyst.py
index 9a9409d0..e98e791f 100644
--- a/tests/unit/agents/test_market_analyst.py
+++ b/tests/unit/agents/test_market_analyst.py
@@ -100,7 +100,9 @@ class TestMarketAnalyst:
         """Test that market analyst correctly processes state variables."""
         # Setup
         mock_toolkit.config = {"online_tools": False}
-        mock_result = MockResult(content="Analysis for AAPL on 2024-05-10", tool_calls=[])
+        mock_result = MockResult(
+            content="Analysis for AAPL on 2024-05-10", tool_calls=[]
+        )
 
         # Mock the chain to capture the invoke call
         mock_chain = Mock()
@@ -125,7 +127,9 @@ class TestMarketAnalyst:
         """Test handling when no tool calls are made."""
         # Setup
         mock_toolkit.config = {"online_tools": False}
-        mock_result = MockResult(content="No tools needed", tool_calls=[])  # Empty tool calls
+        mock_result = MockResult(
+            content="No tools needed", tool_calls=[]
+        )  # Empty tool calls
         mock_llm.bind_tools.return_value.invoke.return_value = mock_result
 
         analyst_node = create_market_analyst(mock_llm, mock_toolkit)
@@ -146,7 +150,9 @@ class TestMarketAnalyst:
         """Test handling when tool calls are present."""
         # Setup
         mock_toolkit.config = {"online_tools": False}
-        mock_result = MockResult(content="Tool analysis", tool_calls=[Mock()])  # Non-empty tool calls
+        mock_result = MockResult(
+            content="Tool analysis", tool_calls=[Mock()]
+        )  # Non-empty tool calls
         mock_llm.bind_tools.return_value.invoke.return_value = mock_result
 
         analyst_node = create_market_analyst(mock_llm, mock_toolkit)
@@ -171,7 +177,7 @@ class TestMarketAnalyst:
         mock_toolkit.config = {"online_tools": online_tools}
         mock_result = MockResult(
             content=f"Analysis in {'online' if online_tools else 'offline'} mode",
-            tool_calls=[]
+            tool_calls=[],
         )
         mock_llm.bind_tools.return_value.invoke.return_value = mock_result
 
@@ -220,7 +226,7 @@ class TestMarketAnalystIntegration:
         | MACD      | +0.45 | Buy     |
         | Volume    | High  | Bullish |
         """,
-            tool_calls=[]
+            tool_calls=[],
         )
         mock_llm.bind_tools.return_value.invoke.return_value = mock_result
 
diff --git a/tests/unit/dataflows/test_utils.py b/tests/unit/dataflows/test_utils.py
index 5e41656d..2d409468 100644
--- a/tests/unit/dataflows/test_utils.py
+++ b/tests/unit/dataflows/test_utils.py
@@ -1,7 +1,6 @@
 """Unit tests for dataflows utils module."""
 
 
-
 class TestDataflowsUtils:
     """Test suite for dataflows utility functions."""