Open Stack

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Hi all,

this week is quite bumpy for unit testing in gate. First, it was
upgrade to new 'tox' version that broke quite some branches.

And today new testtools 0.9.36 were released and were caught by gate,
which resulted in the following unit test failures in multiple projects:

TestCase.setUp was already called. Do not explicitly call setUp from
your tests. In your own setUp, use super to call the base setUp.

All branches are affected: havana, icehouse, and master.

This is because the following check was released with the new version
of the library:
https://github.com/testing-cabal/testtools/commit/5c3b92d90a64efaecdc4010a98002bfe8b888517

And the temporary fix is to merge the version pin patch in global
requirements, backport it to stable branches, and merge the updates
from Openstack Proposal Bot to all affected projects. The patch for
master requirements is: https://review.openstack.org/#/c/116267/

In the meantime, projects will need to fix their tests not to call
setUp() and tearDown() twice. This will be the requirement to unpin
the version of the library.

So, please review, backport, and make sure it lands in project
requirements files.

/Ihar
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