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diff --git a/t/t3405-rebase-malformed.sh b/t/t3405-rebase-malformed.sh
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+++ b/t/t3405-rebase-malformed.sh
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+#!/bin/sh
+
+test_description='rebase should handle arbitrary git message'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+cat >F <<\EOF
+This is an example of a commit log message
+that does not  conform to git commit convention.
+
+It has two paragraphs, but its first paragraph is not friendly
+to oneline summary format.
+EOF
+
+cat >G <<\EOF
+commit log message containing a diff
+EOF
+
+
+test_expect_success setup '
+
+	>file1 &&
+	>file2 &&
+	git add file1 file2 &&
+	test_tick &&
+	git commit -m "Initial commit" &&
+	git branch diff-in-message &&
+	git branch empty-message-merge &&
+
+	git checkout -b multi-line-subject &&
+	cat F >file2 &&
+	git add file2 &&
+	test_tick &&
+	git commit -F F &&
+
+	git cat-file commit HEAD | sed -e "1,/^\$/d" >F0 &&
+
+	git checkout diff-in-message &&
+	echo "commit log message containing a diff" >G &&
+	echo "" >>G &&
+	cat G >file2 &&
+	git add file2 &&
+	git diff --cached >>G &&
+	test_tick &&
+	git commit -F G &&
+
+	git cat-file commit HEAD | sed -e "1,/^\$/d" >G0 &&
+
+	git checkout empty-message-merge &&
+	echo file3 >file3 &&
+	git add file3 &&
+	git commit --allow-empty-message -m "" &&
+
+	git checkout main &&
+
+	echo One >file1 &&
+	test_tick &&
+	git add file1 &&
+	git commit -m "Second commit"
+'
+
+test_expect_success 'rebase commit with multi-line subject' '
+
+	git rebase main multi-line-subject &&
+	git cat-file commit HEAD | sed -e "1,/^\$/d" >F1 &&
+
+	test_cmp F0 F1 &&
+	test_cmp F F0
+'
+
+test_expect_success 'rebase commit with diff in message' '
+	git rebase main diff-in-message &&
+	git cat-file commit HEAD | sed -e "1,/^$/d" >G1 &&
+	test_cmp G0 G1 &&
+	test_cmp G G0
+'
+
+test_expect_success 'rebase -m commit with empty message' '
+	git rebase -m main empty-message-merge
+'
+
+test_expect_success 'rebase -i commit with empty message' '
+	git checkout diff-in-message &&
+	set_fake_editor &&
+	test_must_fail env FAKE_COMMIT_MESSAGE=" " FAKE_LINES="reword 1" \
+		git rebase -i HEAD^
+'
+
+test_done