As we saw, Bitcoin is using a test_framework of its own to testing thousands of cases. All the script files here are using test_framework.
The main question is: Why instead of use unittest, a special custom test system was written from the beginning? Is there a goal or plan of migrating whole testing system to the unittest?
Thank you, just wondering... :)
The tests in /tests/functional are integration tests of the built C++ bitcoind, not python unit tests.
While it could probably be translated to use unittest, a lot of the complexity of the test framwork is how to speak with bitcoind in many ways (startup/shutdown, rpc, p2p, create datadirs). So except for naming differences of some methods, it wouldn't make a huge difference to migrate, I believe. So probably not worth the effort.