Zope-testing

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- Nothing changed yet.

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- Remove dependencies on ``zope.interface`` and ``zope.exceptions``;
they're not used here.

- Remove use of 2to3 for outdated versions of PyPy3, letting us build
universal wheels.

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- Add support for Python 3.6.

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- Introduce option flag ``IGNORE_EXCEPTION_MODULE_IN_PYTHON2`` to normalize
exception class names in traceback output. In Python 3 they are displayed as
the full dotted name. In Python 2 they are displayed as "just" the class
name. When running doctests in Python 3, the option flag will not have any
effect, however when running the same test in Python 2, the segments in the
full dotted name leading up to the class name are stripped away from the
"expected" string.

- Drop support for Python 2.6 and 3.2.

- Add support for Python 3.5.

- Cleaned up useless 2to3 conversion.

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- Added meta data for test case methods created with
``zope.testing.doctestcase``.

- Reasonable values for ``__name__``, making sure that ``__name__``
starts with ``test``.

- For ``doctestfile`` methods, provide ``filename`` and ``filepath``
attributes.

The meta data us useful, for example, for selecting tests with the
nose attribute mechanism.

- Added ``doctestcase.doctestfiles``

- Define multiple doctest files at once.

- Automatically assign test class members. So rather than::

class MYTests(unittest.TestCase):
...
test_foo = doctestcase.doctestfile('foo.txt')

You can use::

doctestcase.doctestfiles('foo.txt', 'bar.txt', ...)
class MYTests(unittest.TestCase):
...

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- Added ``zope.testing.setupstack.mock`` as a convenience function for
setting up mocks in tests. (The Python ``mock`` package must be in
the path for this to work. The excellent ``mock`` package isn't a
dependency of ``zope.testing``.)

- Added the base class ``zope.testing.setupstack.TestCase`` to make it
much easier to use ``zope.testing.setupstack`` in ``unittest`` test
cases.