Under cras/src/dsp/tests we have some test programs like eq2_test.
It should be useful to catch SoC issue on DSP in the factory:

ref: https://buganizer.corp.google.com/issues/65527629
Some bad SoC cause CRAS DSP to behave weird and output bad samples.

note for myself to build test program:
gcc -o eq2_test eq2_test.c raw.c dsp_test_util.c ../eq2.c ../dsp_util.c ../biquad.c -I ../ -lm

Also, currently there is a bug in reading the raw format file.