could take an optional argument which is the module to test (just this particular one).
Current default is all, and super slow.
On my computer:
time make test
The TESTABLE variable is supposed to let us select specific modules to test, but I'm not sure it is supported by qtest. Making it work more smoothly would indeed be very nice. There is also work to be done to detect tests that are too slow and change them, or disable them by default, with possibly a test-slow target that we could run less often. I initially thought randomized tests were the culprits, but c-cube remarked that it in fact seems to come from the testsuite part.