Add unit tests for LspGraphBuilder class

- Implement comprehensive unit tests for the LspGraphBuilder class to validate its functionality in building code association graphs.
- Tests cover various scenarios including single level graph expansion, max nodes and depth boundaries, concurrent expansion limits, document symbol caching, error handling during node expansion, and edge cases such as empty seed lists and self-referencing nodes.
- Utilize pytest and asyncio for asynchronous testing and mocking of LspBridge methods.

codex-lens/tests/real/concurrent_test.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+"""Test concurrent read loop behavior."""
+
+import asyncio
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.parent.parent / "src"))
+
+import logging
+logging.basicConfig(level=logging.DEBUG, format='%(name)s - %(levelname)s - %(message)s')
+
+from codexlens.lsp.standalone_manager import StandaloneLspManager
+
+async def test():
+    workspace = Path(__file__).parent.parent.parent
+    manager = StandaloneLspManager(
+        workspace_root=str(workspace),
+        timeout=30.0
+    )
+    
+    await manager.start()
+    
+    # Get server for a simple file
+    simple_content = "def hello():\n    pass\n"
+    simple_file = workspace / "test_simple.py"
+    simple_file.write_text(simple_content)
+    
+    try:
+        print("\n=== Getting server ===")
+        state = await manager._get_server(str(simple_file))
+        print(f"Server state: initialized={state.initialized if state else 'None'}")
+        
+        print("\n=== Sending didOpen ===")
+        await manager._send_notification(state, "textDocument/didOpen", {
+            "textDocument": {
+                "uri": simple_file.as_uri(),
+                "languageId": "python",
+                "version": 1,
+                "text": simple_content,
+            }
+        })
+        
+        print("\n=== Waiting 5 seconds - watch for server requests ===")
+        for i in range(5):
+            print(f"  Tick {i+1}...")
+            await asyncio.sleep(1.0)
+        
+        print("\n=== Sending documentSymbol ===")
+        result = await manager._send_request(
+            state,
+            "textDocument/documentSymbol",
+            {"textDocument": {"uri": simple_file.as_uri()}},
+            timeout=10.0
+        )
+        print(f"Result: {result}")
+        
+    finally:
+        simple_file.unlink(missing_ok=True)
+        await manager.stop()
+
+if __name__ == "__main__":
+    asyncio.run(test())