bcache test suites

Dear bcache maintainers

I hope this email finds you well.

I'm interested in making some changes to bcache and would like to make
sure that my changes are well-tested. I wonder if you could give me
pointers about the test suites available for bcache. I'm particularly
interested in knowing:

- What types of tests are available?
- How can I run the tests?

Thank you for your time and consideration.

Sincerely,
Robert Pang

P.S. I checked [1] and the associated docs but found no references.
Nor I found any handily under Linux ktest. Separately, I found [2] and
[3] which seem to have some coverage for bcache, but am unsure if they
are the right ones.

[1] https://www.kernel.org/doc/Documentation/bcache.txt
[2] https://github.com/koverstreet/ktest
[3] https://github.com/jthornber/device-mapper-test-suite