[openstack-dev] [all] re-introducing twisted to global-requirements

Julien Danjou julien at danjou.info
Fri Jan 8 09:49:12 UTC 2016

On Thu, Jan 07 2016, Jay Pipes wrote:

> OK, I just watched that. Sorry, still don't see the value that Mimic provides
> over unit testing the client interfaces and mocking out the HTTP payloads so
> you have strict control over the expectations.
> The problem that Glyph noted in the video about the unit test that mocked out
> os.chdir to improperly return a value isn't solved whatsoever by Mimic, so I
> find it odd that that example was used in discussing the value of Mimic. Bad
> mocks are just that: bad mocks. The same false positive failure could easily be
> introduced with a typo in the "metadata injection" that Mimic does to inject
> failures into the system.
> Mimic isn't testing anything on the server side at all so I'm not sure why
> folks call it "integration testing". It isn't testing the integration of
> anything at all. All it enables is multi-language client library testing, and
> see my response to Ben, the surface area it introduces for bugs in the test
> platform itself in my opinion outweigh the multi-language value it might have.

I completely agree with what Jay points out here.

To illustrate with what we do in the Telemetry team: in order test
gnocchiclient, we pip install gnocchi¹, configure it briefly and use the
client against that freshly installed server. It works very well, and
we're sure we test against real data. That's what I would call
integration testing.
We could also easily test against older version of the Gnocchi server by
pip install-ing an older version if we wanted.

This has way more value than mocking the whole HTTP server and crossing
fingers we did a good job mimicking it. Oh, and it's also actually less
work. :)

¹  https://github.com/openstack/python-gnocchiclient/blob/master/setup-tests.sh

Julien Danjou
;; Free Software hacker
;; https://julien.danjou.info
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