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Re: [PATCH 0/8] Resend of GIT_TEST_PROTOCOL_VERSION patches

On Wed, Feb 06 2019, Jeff King wrote:

> On Tue, Feb 05, 2019 at 04:21:14PM -0800, Jonathan Tan wrote:
>> This is on the latest master (8feddda32c ("Fifth batch for 2.21",
>> 2019-02-05)) + js/protocol-advertise-multi.
>> This is a resend of [1], which was built on the result of merging many
>> branches. Now that most of the branches have been merged to master, I
>> have rebased it on master. The only branch that I needed to merge was
>> js/protocol-advertise-multi.
> Thanks for working on this. With the exception of the final patch, this
> all seems pretty sane to me from a quick look.
> There is one thing that your test patches made me wonder. When we have
> to make an exception to a test (i.e., that doesn't work under v2), you
> do it by unsetting GIT_TEST_PROTOCOL_VERSION in the environment. That
> means we'll actually run the test, but not with the version that the
> caller specified.
> I wonder if it would be more obvious what's going on if we instead had a
> prereq like:
>   test_expect_success !PROTO_V2 'ls-remote --symref' '
>      ...
>   '
> and just skipped those tests entirely (and in a way that appears in the
> TAP output).
> I think it would also future-proof us a bit for v2 becoming the default
> (i.e., when GIT_TEST_PROTOCOL_VERSION being blank does mean "use v2").
> I dunno. It probably doesn't matter all that much, so it may not be
> worth going back and changing at this point. Just a thought.

So far we've had the convention that these GIT_TEST_* variables,
e.g. the one for the commit graph, work the same way. Thus we guarantee
that we get (in theory) 100% coverage even when running the tests in
this special mode. I think it's better to keep it as-is.