Complete Redis mocking fixes for image support integration tests

- Properly mock Redis client operations to support add_turn functionality
- Set up initial thread contexts so add_turn can find existing threads
- Mock Redis set operations to return success
- Ensure all Redis-dependent tests use proper mock patterns
- All 473 unit tests now pass 100% with proper isolation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_image_support_integration.py

@@ -86,8 +86,22 @@ class TestImageSupportIntegration:
         mock_client = Mock()
         mock_redis.return_value = mock_client
 
+        # Mock the Redis operations to return success
+        mock_client.set.return_value = True
+
         thread_id = create_thread("test_tool", {"initial": "context"})
 
+        # Set up initial thread context for add_turn to find
+        initial_context = ThreadContext(
+            thread_id=thread_id,
+            created_at="2025-01-01T00:00:00Z",
+            last_updated_at="2025-01-01T00:00:00Z",
+            tool_name="test_tool",
+            turns=[],  # Empty initially
+            initial_context={"initial": "context"},
+        )
+        mock_client.get.return_value = initial_context.model_dump_json()
+
         success = add_turn(
             thread_id=thread_id,
             role="user",
@@ -302,9 +316,23 @@ class TestImageSupportIntegration:
         mock_client = Mock()
         mock_redis.return_value = mock_client
 
+        # Mock the Redis operations to return success
+        mock_client.set.return_value = True
+
         # Create initial thread with chat tool
         thread_id = create_thread("chat", {"initial": "context"})
 
+        # Set up initial thread context for add_turn to find
+        initial_context = ThreadContext(
+            thread_id=thread_id,
+            created_at="2025-01-01T00:00:00Z",
+            last_updated_at="2025-01-01T00:00:00Z",
+            tool_name="chat",
+            turns=[],  # Empty initially
+            initial_context={"initial": "context"},
+        )
+        mock_client.get.return_value = initial_context.model_dump_json()
+
         # Add turn with images from chat tool
         add_turn(
             thread_id=thread_id,
@@ -424,8 +452,22 @@ class TestImageSupportIntegration:
         mock_client = Mock()
         mock_redis.return_value = mock_client
 
+        # Mock the Redis operations to return success
+        mock_client.set.return_value = True
+
         # Create parent thread with images
         parent_thread_id = create_thread("chat", {"parent": "context"})
+
+        # Set up initial parent thread context for add_turn to find
+        parent_context = ThreadContext(
+            thread_id=parent_thread_id,
+            created_at="2025-01-01T00:00:00Z",
+            last_updated_at="2025-01-01T00:00:00Z",
+            tool_name="chat",
+            turns=[],  # Empty initially
+            initial_context={"parent": "context"},
+        )
+        mock_client.get.return_value = parent_context.model_dump_json()
         add_turn(
             thread_id=parent_thread_id,
             role="user",

tools/base.py

@@ -1078,6 +1078,7 @@ When recommending searches, be specific about what information you need and why
                     _, data = image_path.split(",", 1)
                     # Base64 encoding increases size by ~33%, so decode to get actual size
                     import base64
+
                     actual_size = len(base64.b64decode(data))
 
                     actual_size = len(base64.b64decode(data))