t6300: refactor %(trailers) tests

We currently have one test for %(trailers) in `git-for-each-ref(1)`,
through "%(contents:trailers)". In preparation for more, let's add a few
things:

  - Move the commit creation step to its own test so that it can be
  re-used.

  - Add a non-trailer to the commit's trailers to test that non-trailers
  aren't shown using "%(trailers:only)".

  - Add a multi-line trailer to ensure that trailers are unfolded
  correctly using "%(trailers:unfold)".

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 2274a4b73310bfbc90886e0179a1cb12d9b6f3ed..39431908d54970f8c962f37c3ea05cf3790b03fc 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -605,18 +605,25 @@ test_expect_success 'do not dereference NULL upon %(HEAD) on unborn branch' '
 cat >trailers <<EOF
 Reviewed-by: A U Thor <author@example.com>
 Signed-off-by: A U Thor <author@example.com>
+[ v2 updated patch description ]
+Acked-by: A U Thor
+  <author@example.com>
 EOF
 
-test_expect_success 'basic atom: head contents:trailers' '
+
+test_expect_success 'set up trailers for next test' '
        echo "Some contents" > two &&
        git add two &&
-       git commit -F - <<-EOF &&
+       git commit -F - <<-EOF
        trailers: this commit message has trailers
 
        Some message contents
 
        $(cat trailers)
        EOF
+'
+
+test_expect_success 'basic atom: head contents:trailers' '
        git for-each-ref --format="%(contents:trailers)" refs/heads/master >actual &&
        sanitize_pgp <actual >actual.clean &&
        # git for-each-ref ends with a blank line