Re: [PATCH v5] unit tests: Add a project plan document

[Josh Steadmon <steadmon@google.com>]

On 2023.08.14 14:29, Phillip Wood wrote:
> Hi Josh
> 
> On 08/08/2023 00:07, Josh Steadmon wrote:
> > 
> > Reviewers can help this series progress by discussing whether it's
> > acceptable to rely on `prove` as a test harness for unit tests. We
> > support this for the current shell tests suite, but it is not strictly
> > required.
> 
> If possible it would be good to be able to run individual test programs
> without a harness as we can for our integration tests. For running more than
> one test program in parallel I think it is fine to require a harness.

Sounds good. This is working in v6 which I hope to send to the list
soon.


> I don't have a strong preference for which harness we use so long as it
> provides a way to (a) run tests that previously failed tests first and (b)
> run slow tests first. I do have a strong preference for using the same
> harness for both the unit tests and the integration tests so developers
> don't have to learn two different tools. Unless there is a problem with
> prove it would probably make sense just to keep using that as the project
> test harness.

To be clear, it sounds like both of these can be done with `prove`
(using the various --state settings) without any further support from
our unit tests, right? I see that we do have a "failed" target for
re-running integration tests, but that relies on some test-lib.sh
features that currently have no equivalent in the unit test framework.


> > TODOs remaining:
> > - Discuss pre-existing harnesses for the current test suite
> > - Figure out how to evaluate frameworks on additional OSes such as *BSD
> >    and NonStop
> 
> We have .cirrus.yml in tree which I think gitgitgadget uses to run our test
> suite on freebsd so we could leverage that for the unit tests. As for
> NonStop I think we'd just have to rely on Randall running the tests as he
> does now for the integration tests.

Thanks for the pointer. I've updated .cirrus.yml (as well as the GitHub
CI configs) for v6.


> > Changes in v5:
> > - Add comparison point "License".
> > - Discuss feature priorities
> > - Drop frameworks:
> >    - Incompatible licenses: libtap, cmocka
> >    - Missing source: MyTAP
> >    - No TAP support: µnit, cmockery, cmockery2, Unity, minunit, CUnit
> > - Drop comparison point "Coverage reports": this can generally be
> >    handled by tools such as `gcov` regardless of the framework used.
> > - Drop comparison point "Inline tests": there didn't seem to be
> >    strong interest from reviewers for this feature.
> > - Drop comparison point "Scheduling / re-running": this was not
> >    supported by any of the main contenders, and is generally better
> >    handled by the harness rather than framework.
> > - Drop comparison point "Lazy test planning": this was supported by
> >    all frameworks that provide TAP output.
> 
> These changes all sound sensible to me
> 
> The trimmed down table is most welcome. The custom implementation supports
> partial parallel execution. It shouldn't be too difficult to add some signal
> handling to it depending on what we want it to do.
> 
> It sounds like we're getting to the point where we have pinned down our
> requirements and the available alternatives well enough to make a decision.

Yes, v6 will include your TAP implementation (I assume you are still OK
if I include your patch in this series?).

> Best Wishes
> 
> Phillip
>