Re: [PATCH 1/2 v2] test-lib.sh: introduce 4th argument to test_commit() specifying a tag name

> When fourth argument to test_commit() is specified, use it as a tag
> name, unless it equals to empty string.  In the latter case, skip tag
> creation.
>
> Suggested-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
> ---
>  t/README      |    8 ++++----
>  t/test-lib.sh |   11 ++++++++---
>  2 files changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/t/README b/t/README
> index 0d1183c..18f5810 100644
> --- a/t/README
> +++ b/t/README
> @@ -388,13 +388,13 @@ library for your script to use.
>    committer times to defined stated.  Subsequent calls will
>    advance the times by a fixed amount.
>
> - - test_commit <message> [<filename> [<contents>]]
> + - test_commit <message> [<filename> [<contents> [<tagname>]]]
>
>    Creates a commit with the given message, committing the given
>    file with the given contents (default for both is to reuse the
> -   message string), and adds a tag (again reusing the message
> -   string as name).  Calls test_tick to make the SHA-1s
> -   reproducible.
> +   message string), and adds a tag with the given name (default again
> +   is to reuse the message string as name) unless this name is the
> +   empty string.  Calls test_tick to make the SHA-1s reproducible.
>
>  - test_merge <message> <commit-or-tag>
>
> diff --git a/t/test-lib.sh b/t/test-lib.sh
> index e5523dd..ebb6215 100644
> --- a/t/test-lib.sh
> +++ b/t/test-lib.sh
> @@ -277,10 +277,12 @@ test_tick () {
>        export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
>  }
>
> -# Call test_commit with the arguments "<message> [<file> [<contents>]]"
> +# Call test_commit with the arguments
> +# "<message> [<file> [<contents> [<tagname>]]]"
>  #
>  # This will commit a file with the given contents and the given commit
> -# message.  It will also add a tag with <message> as name.
> +# message.  It will also add a tag with the given name unless the latter
> +# is the empty string.
>  #
>  # Both <file> and <contents> default to <message>.
>
> @@ -290,7 +292,10 @@ test_commit () {
>        git add "$file" &&
>        test_tick &&
>        git commit -m "$1" &&
> -       git tag "$1"
> +       if test -n "${4-$1}"
> +       then
> +               git tag "${4-$1}"
> +       fi
>  }
>
>  # Call test_merge with the arguments "<message> <commit>", where <commit>