Re: [PATCH v6 01/22] fsck tests: refactor one test to use a sub-repo

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On Tue, Sep 07, 2021 at 12:57:56PM +0200, Ævar Arnfjörð Bjarmason wrote:
> Refactor one of the fsck tests to use a throwaway repository. It's a
> pervasive pattern in t1450-fsck.sh to spend a lot of effort on the
> teardown of a tests so we're not leaving corrupt content for the next
> test.

OK. I seem to recall you advocating against this pattern elsewhere[1], but
this is a good example of why it can sometimes make writing tests much
easier when not having to reason about what leaks out of running a test.

[1]: https://lore.kernel.org/git/87zgsnj0q0.fsf@xxxxxxxxxxxxxxxxxxx/,
although after re-reading it it looks like you were more focused on the
unnecessary "rm -fr repo" there and not the "git init +
test_when_finished rm -fr" pattern.

> -test_expect_success 'object with bad sha1' '
> -	sha=$(echo blob | git hash-object -w --stdin) &&
> -	old=$(test_oid_to_path "$sha") &&
> -	new=$(dirname $old)/$(test_oid ff_2) &&
> -	sha="$(dirname $new)$(basename $new)" &&
> -	mv .git/objects/$old .git/objects/$new &&
> -	test_when_finished "remove_object $sha" &&
> -	git update-index --add --cacheinfo 100644 $sha foo &&
> -	test_when_finished "git read-tree -u --reset HEAD" &&
> -	tree=$(git write-tree) &&
> -	test_when_finished "remove_object $tree" &&
> -	cmt=$(echo bogus | git commit-tree $tree) &&
> -	test_when_finished "remove_object $cmt" &&
> -	git update-ref refs/heads/bogus $cmt &&
> -	test_when_finished "git update-ref -d refs/heads/bogus" &&
> -
> -	test_must_fail git fsck 2>out &&
> -	test_i18ngrep "$sha.*corrupt" out
> +test_expect_success 'object with hash mismatch' '
> +	git init --bare hash-mismatch &&
> +	(
> +		cd hash-mismatch &&
> +		oid=$(echo blob | git hash-object -w --stdin) &&
> +		old=$(test_oid_to_path "$oid") &&
> +		new=$(dirname $old)/$(test_oid ff_2) &&
> +		oid="$(dirname $new)$(basename $new)" &&
> +		mv objects/$old objects/$new &&
> +		git update-index --add --cacheinfo 100644 $oid foo &&
> +		tree=$(git write-tree) &&
> +		cmt=$(echo bogus | git commit-tree $tree) &&
> +		git update-ref refs/heads/bogus $cmt &&
> +		test_must_fail git fsck 2>out &&
> +		test_i18ngrep "$oid.*corrupt" out
> +	)
>  '

This all looks fine to me. The translation is s/sha/oid and removing all
of the now-unnecessary test_when_finished calls.

But the test_i18ngrep (which isn't new) could probably also stand to get
cleaned up and converted to a normal grep.

Thanks,
Taylor



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