The tests in os-api-ref recently broke:

Specifically, we're seeing errors likes this:

 Traceback (most recent call last):
 line 143, in decorator
       func(*(args + (app, status, warning)), **kwargs)
 line 41, in setUp
       self.html = (app.outdir / 'index.html').read_text(encoding='utf-8')
   TypeError: unsupported operand type(s) for /: 'str' and 'str'

Which is wrong because 'app.outdir' is not supposed to be an instance
of 'unicode' but rather 'sphinx_testing.path.path' [1] (which overrides
the '/' operator to act as concatenation because operator overloading
is always a good idea 😒) [2].

Anyway, we can go figure out what's changed here and handle it but this
is, at best, going to be a band aid. The fact is 'sphinx_testing' is
unmaintained and has been for some time now. The new hotness is
'sphinx.testing' [3], which is provided (with zero documentation) as
part of Sphinx. Unfortunately, this uses pytest fixtures [4] which I'm
pretty sure Monty (and a few others?) are vehemently against using in
OpenStack. That leaves us with three options:

 * Take over 'sphinx_testing' and bring it up-to-date. Maintain
 * Start using 'sphinx.testing' and everything it comes with
 * Delete any tests that use 'sphinx_testing' and deal with the lack of

For what it's worth, I use 'sphinx.testing' in 'sphinxcontrib-apidoc'
[5] without *too* many issues, but that lives outside the 'openstack'
namespace and isn't bound by upper-constraints and the likes.



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