[PATCH linux-kselftest/test v1] apparmor: add AppArmor KUnit tests for policy unpack

[Iurii Zaikin]

> Why can't unit tests live with the code they're testing? They're already
> logically tied together; what's the harm there? This needn't be the case
> for ALL tests, etc. The test driver could still live externally. The
> test in the other .c would just have exported functions... ?
>
Curiously enough, this approach has been adopted by D 2.0 where unittests are
members of the class under test:  https://digitalmars.com/d/2.0/unittest.html
but such approach is not mainstream.
I personally like the idea of testing the lowest level bits in isolation even if
they are not a part of any interface. I think that specifying the
interface using
unit tests and ensuring implementation correctness are complementary but
I haven't had much luck arguing this with our esteemed colleagues.