Add tests

[Fosowl]

Add as many unit test as possible, especially for parsing function and tools.
Avoid unit test that require request to the LLM.

see https://github.com/Fosowl/agenticSeek/blob/main/tests/test_searx_search.py for a good example

Any collaborators can pick up the task, just add a comment to this issue and I will assign you.

[jennyluciav]

I'd like to contribute with some tests @Fosowl!