Tests Best Practices

Cory Johns cory.johns at canonical.com
Tue Apr 14 16:07:27 UTC 2015

As Nate pointed out, I forgot the link.  >_<

[1]: https://docs.python.org/2/library/unittest.html

On Tue, Apr 14, 2015 at 1:59 PM, Cory Johns <cory.johns at canonical.com> wrote:
> José,
> That's a good point that we definitely need recommended best practices
> for writing charm tests.  I am also behind using the built-in
> unittest[1] library to organize and structure the tests.   I am also
> behind encouraging combining tests inside test cases where possible,
> with the caveat that we frame the recommendation with explicitly
> calling out the tear-down behavior and explaining why it is
> recommended to combine test cases, since there will be cases where
> that is not the best approach because a new environment is required
> (even though it will be the right thing to do most of the time).
> I think we should also include a call-out to the template test
> provided by `charm add tests` (or `charm create`) as the best way to
> get started, as it also incorporates these practices.  However, we
> should note about changing the name of the generated test case file
> away from 99-autogen.
> Thanks for bringing this up and offering these good suggestions.
> On Thu, Apr 9, 2015 at 6:17 PM, José Antonio Rey <jose at ubuntu.com> wrote:
>> Hello everyone,
>> A couple days ago I was going through the docs, and found out that there are
>> not best practices or recommendations for tests. Now that we are trying to
>> ensure quality, I believe it would be a good idea to have them.
>> I know that one of the benefits of Juju being so open is that you can write
>> your charm or tests in any language. However, having these best practices
>> will allow us to set a recommendation for when people are getting started,
>> or don't know how to proceed. I understand that this may be seen as a
>> limitation, but it is instead a guidance for when someone comes to the
>> ecosystem, or wants to get some tips on how to write tests.
>> I was thinking on starting with two points. These are assuming that you are
>> using Python and Amulet to write your tests. The first one, the use of the
>> unit_tests packages. As a starter with Python, I have found out the use of
>> it quite easy, and helps me condensate everything into one big file. Which
>> takes me to the second point, having everything in one file. This would
>> allow us to save resources and time (since bundletester tears down for each
>> file), and would make it look nicer. At least that's how I've been
>> proceeding for my last tests.
>> What do you think? I'm all ears to new suggestions or why these aren't good.
>> --
>> José Antonio Rey
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