[PATCH 6/7] t5520: test --rebase failure on unborn branch with index

[Paul Tan <pyokagan@gmail.com>]

Commit 19a7fcbf (allow pull --rebase on branch yet to be born) special
cases git-pull on an unborn branch in a different code path such that
git-pull --rebase is still valid even though there is no HEAD yet.

This code path still ensures that there is no index in order not to lose
any staged changes. Implement a test to ensure that this check is
triggered.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

I wonder if the .git/index check is still required, as git-read-tree -m
will take into account entries in the index as well.

 t/t5520-pull.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index 17c63ff..34f3780 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -417,6 +417,17 @@ test_expect_success 'pull --rebase works on branch yet to be born' '
 	test_cmp expect actual
 '
 
+test_expect_success 'pull --rebase fails on unborn branch with staged changes' '
+	git init empty_repo2 &&
+	test_when_finished "rm -rf empty_repo2" &&
+	(
+		cd empty_repo2 &&
+		echo staged-file >staged-file &&
+		git add staged-file &&
+		test_must_fail git pull --rebase .. master
+	)
+'
+
 test_expect_success 'setup for detecting upstreamed changes' '
 	mkdir src &&
 	(cd src &&
-- 
2.1.4