[PATCH v3 1/3] t/t3430: avoid undefined git diff behavior

["Chris Torek via GitGitGadget" <gitgitgadget@gmail.com>]

From: Chris Torek <chris.torek@gmail.com>

The autosquash-and-exec test used "git diff HEAD^!" to mean
"git diff HEAD^ HEAD".  Use these directly instead of relying
on the undefined but actual-current behavior of "HEAD^!".

Signed-off-by: Chris Torek <chris.torek@gmail.com>
---
 t/t3430-rebase-merges.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index a1bc3e20016..b454f400ebd 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -420,7 +420,7 @@ test_expect_success 'with --autosquash and --exec' '
 	git commit --fixup B B.t &&
 	write_script show.sh <<-\EOF &&
 	subject="$(git show -s --format=%s HEAD)"
-	content="$(git diff HEAD^! | tail -n 1)"
+	content="$(git diff HEAD^ HEAD | tail -n 1)"
 	echo "$subject: $content"
 	EOF
 	test_tick &&
-- 
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