Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
will ensure that the index is clean before applying the patch. This is
to prevent changes unrelated to the patch from being committed.

Add a test for this check.

Cc: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Paul Tan <pyoka...@gmail.com>
---
 t/t4150-am.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 3f54bdf..0a19136 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -154,6 +154,17 @@ test_expect_success 'am applies patch correctly' '
        test "$(git rev-parse second^)" = "$(git rev-parse HEAD^)"
 '
 
+test_expect_success 'am fails if index is dirty' '
+       test_when_finished "rm -fr dirtyfile" &&
+       rm -fr .git/rebase-apply &&
+       git checkout -f first &&
+       echo dirtyfile >dirtyfile &&
+       git add dirtyfile &&
+       test_must_fail git am patch1 &&
+       test_path_is_dir .git/rebase-apply &&
+       test_cmp_rev first HEAD
+'
+
 test_expect_success 'am applies patch e-mail not in a mbox' '
        rm -fr .git/rebase-apply &&
        git reset --hard &&
-- 
2.5.0.rc1.81.gfe77482

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