Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
will invoke the applypatch-msg hooks just after extracting the patch
message. If the applypatch-msg hook exits with a non-zero status, git-am
abort before even applying the patch to the index.

Add tests for this hook.

Cc: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Paul Tan <pyoka...@gmail.com>
---
 t/t4150-am.sh | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 05494e9..24c1b42 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -198,6 +198,45 @@ test_expect_success 'am applies patch e-mail with 
preceding whitespace' '
        test "$(git rev-parse second^)" = "$(git rev-parse HEAD^)"
 '
 
+test_expect_success 'am with applypatch-msg hook' '
+       test_when_finished "rm -f .git/hooks/applypatch-msg" &&
+       rm -fr .git/rebase-apply &&
+       git reset --hard &&
+       git checkout first &&
+       mkdir -p .git/hooks &&
+       cat >.git/hooks/applypatch-msg <<-\EOF &&
+       #!/bin/sh
+       cat "$1" >actual-msg &&
+       echo hook-message >"$1"
+       EOF
+       chmod +x .git/hooks/applypatch-msg &&
+       git am patch1 &&
+       test_path_is_missing .git/rebase-apply &&
+       git diff --exit-code second &&
+       echo hook-message >expected &&
+       git log -1 --format=format:%B >actual &&
+       test_cmp expected actual &&
+       git log -1 --format=format:%B second >expected &&
+       test_cmp expected actual-msg
+'
+
+test_expect_success 'am with failing applypatch-msg hook' '
+       test_when_finished "rm -f .git/hooks/applypatch-msg" &&
+       rm -fr .git/rebase-apply &&
+       git reset --hard &&
+       git checkout first &&
+       mkdir -p .git/hooks &&
+       cat >.git/hooks/applypatch-msg <<-\EOF &&
+       #!/bin/sh
+       exit 1
+       EOF
+       chmod +x .git/hooks/applypatch-msg &&
+       test_must_fail git am patch1 &&
+       test_path_is_dir .git/rebase-apply &&
+       git diff --exit-code first &&
+       test_cmp_rev first HEAD
+'
+
 test_expect_success 'setup: new author and committer' '
        GIT_AUTHOR_NAME="Another Thor" &&
        GIT_AUTHOR_EMAIL="a.t...@example.com" &&
-- 
2.5.0.rc1.81.gfe77482

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