[Gnuk-users] New test suite in tests/

[NIIBE Yutaka]

Hello,

In Gnuk, we have test/ directory which has test cases for Gnuk.  I use
Nose + Freshen for those tests, but Freshen is now deprecated.

So, I am trying to migrate those tests into another tests/ directory
with Pytest.  In this migration, I am currently try to support Achim's
original OpenPGP card as well.

Finally, I found that removing a key material can be done by changing
key attributes, so, it would be possible to support both implementation
by a single test suite.
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