Re: [PATCH v2 3/6] t1302: make tests more robust with new extensions

> [[PGP Signed Part:Undecided]]
> [1. text/plain]
> In t1302 we exercise logic around "core.repositoryFormatVersion" and
> extensions. These tests are not particularly robust against extensions
> like the newly introduced "refStorage" extension.
>
> Refactor the tests to be more robust:
>
>   - Check the DEFAULT_REPO_FORMAT prereq to determine the expected
>     repository format version. This helps to ensure that we only need to
>     update the prereq in a central place when new extensions are added.
>
>   - Use a separate repository to rewrite ".git/config" to test
>     combinations of the repository format version and extensions. This
>     ensures that we don't break the main test repository.
>
>   - Do not rewrite ".git/config" when exercising the "preciousObjects"
>     extension.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  t/t1302-repo-version.sh | 19 +++++++++++++++----
>  1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/t/t1302-repo-version.sh b/t/t1302-repo-version.sh
> index 179474fa65..7c680c91c4 100755
> --- a/t/t1302-repo-version.sh
> +++ b/t/t1302-repo-version.sh
> @@ -79,8 +84,13 @@ mkconfig () {
>
>  while read outcome version extensions; do
>  	test_expect_success "$outcome version=$version $extensions" "
> -		mkconfig $version $extensions >.git/config &&
> -		check_${outcome}
> +		test_when_finished 'rm -rf extensions' &&
> +		git init extensions &&
> +		(
> +			cd extensions &&
> +			mkconfig $version $extensions >.git/config &&