Re: [PATCH v3 1/3] t3201: test multiple branch filter combinations

From: Junio C Hamano <gitster@pobox.com>
To: Eric Sunshine <sunshine@sunshineco.com>
Cc: Aaron Lipman <alipman88@gmail.com>, Git List <git@vger.kernel.org>
Subject: Re: [PATCH v3 1/3] t3201: test multiple branch filter combinations
Date: Mon, 14 Sep 2020 13:07:27 -0700	[thread overview]
Message-ID: <xmqqd02oktq8.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: CAPig+cRrgC5vz9S1qDpEjoEvniBLCbuWt=bkpa2fj=suUm3Bog@mail.gmail.com

Eric Sunshine <sunshine@sunshineco.com> writes:

> A few comments:
>
> I didn't examine it too closely, so this may be a silly question, but
> is there a reason to start from scratch (by deleting all the branches)
> rather than simply using or extending the existing branches like the
> other tests do?
>
> If it really does make sense to start from scratch (ignoring the
> existing branches), then an alternative would be to create a new
> repository and run the tests in that repository instead. Whether or
> not doing so makes sense in this case is a judgment call. For
> instance:
>
>     test_create_repo features
>     (
>         cd features
>         ...setup stuff...
>     )

Good comments; I agree with both.

> It's a bit concerning to see output from porcelain git-branch being
> fed to 'grep' and 'xargs'. More typically, you would instead rely upon
> the (stable) output of a plumbing command. For instance:
>
>     git for-each-ref --format="%(refname:short)" refs/heads/ | ...
>
> In new test code, normally avoid having a Git command upstream of a
> pipe since its exit code will be lost. Thus, you might instead write:
>
>     git for-each-ref ... >heads &&
>     grep -v master heads | xargs git branch -D &&

Again, good recommendation.

Thank you always for helpful reviews.