test-harness in Readme

math-tutor/README.md

@@ -225,6 +225,8 @@ cd math-tutor/backend
 python -m test.generate_socratic_chats_test
 ```
 
+hint_test_harness.py and retrieval_store_test_harness.py provide functions to test specific comonents isolatet.
+
 ## Generate Socratic Initial Prompts
 
 ```powershell