Functional unit tests for llamafile_sgemm API.

[amritahs]

Are there any tests available to check the functional correctness of llamafile_sgemm API?.
I plan to come up with an implementation for GGML_TYPE_Q8_0, and I need to know if there is any test to check the functional correctness of the output. Earlier benchmark-matmul.cpp had test code to do the same for GGML_TYPE_Q4_0, but I don't see any similar tests in the latest code.