[Zope-dev] Avoid deprecation warnings in the testrunner

[Fabio Tranchitella]

Hello,

I think we should provide a zope.testing package which does not emit
deprecation warnings while running the testrunner on other packages,
otherwise there is no way to really understand why the package you are
working on is using a deprecated API.

I propose the patch attached to this message to zope.testing.

It tries to avoid importing zope.testing.doctest unless it is really
needed. In this way, developers can see the DeprecationWarning with the
path of *their* code, and fix it, instead of receiving the
DeprecationWarning because the testrunner imports zope.testing.doctest
itself.

Before applying the patch, running the tests on another package produced
this output:

-----------------------------------------------------------------------
.../zope/testing/testrunner/debug.py:23: DeprecationWarning: zope.testing.doctest is deprecated in favour of the Python standard library doctest module
  from zope.testing import doctest
Running zope.testing.testrunner.layer.UnitTests tests:
  ...
-----------------------------------------------------------------------

After applying my patch, I get this:

-----------------------------------------------------------------------
.../zope/interface/tests/test_adapter.py:405: DeprecationWarning: zope.testing.doctest is deprecated in favour of the Python standard library doctest module
  from zope.testing import doctest
Running zope.testing.testrunner.layer.UnitTests tests:
  ...
-----------------------------------------------------------------------

Comments?

Thanks,
Fabio
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