xfstests has been merged in chromeos to test ext4 crypto (see third_party/autotest/files/client/tests/xfstests/control).

That test enable ext4 crypto dummy mode.
For every xfstests test specified, it creates a job. It fits nicely with the autotest framework (we see at the end of the job how many xfstests tests pass/failed), but it is time and server space consuming.

- Add more tests:
 + split boiler plate code from the huge control file away in a library.
 + ability to test ext4 plain as well as ext4 crypto by adding a simple control file.
 + tune control file to ensure the smallest amount of data is copied to the server between test.

- Add standalone test mode:
 for speed purpose have a mode where xfstests tests are all run in a single job. That job would probably fail, it will be user responsibility to go in the result files to see which tests failed. However it will be faster to run and we let xfstest choose which tests to run based on the control file argument, like the group(s) to run.