I can help with these tests. Did you have a test set or suggestions about
the test?
There are a rather exhaustive tests at apps/testing/smart and
apps/testing/smartfs.
I would use the simulator with simulated FLASH to do the test. There is
no existing SmartFS simulation test configuration but there are tests
sim:nxffs and sim:spiffs for other file systems that could easily be
adapted.
The nice thing about using simulated FLASH is that you can run crazy
long tests very quickly with no wear on any physical FLASH parts.
Greg