[RFC/PATCH 2/3] t9301: Add 2nd testcase exposing bugs in fast-import's notes fanout handling

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The previous patch exposed a bug in fast-import where _removing_ an existing
note fails (when that note resides on a non-zero fanout level, and was added
prior to this fast-import run).

This patch demostrates the same issue when _changing_ an existing note
(subject to the same circumstances).

Discovered-by: Henrik Grubbström <grubba@xxxxxxxxx>
Signed-off-by: Johan Herland <johan@xxxxxxxxxxx>
---
 t/t9301-fast-import-notes.sh |   54 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/t/t9301-fast-import-notes.sh b/t/t9301-fast-import-notes.sh
index fd08161..57d85a6 100755
--- a/t/t9301-fast-import-notes.sh
+++ b/t/t9301-fast-import-notes.sh
@@ -505,6 +505,60 @@ test_expect_success 'verify that non-notes are untouched by a fanout change' '
 	test_cmp expect_non-note3 actual
 
 '
+
+# Change the notes for the three top commits
+test_tick
+cat >input <<INPUT_END
+commit refs/notes/many_notes
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+data <<COMMIT
+changing notes for the top three commits
+COMMIT
+from refs/notes/many_notes^0
+INPUT_END
+
+rm expect
+i=$num_commits
+j=0
+while test $j -lt 3
+do
+	cat >>input <<INPUT_END
+N inline refs/heads/many_commits~$j
+data <<EOF
+changed note for commit #$i
+EOF
+INPUT_END
+	cat >>expect <<EXPECT_END
+    commit #$i
+    changed note for commit #$i
+EXPECT_END
+	i=$(($i - 1))
+	j=$(($j + 1))
+done
+
+test_expect_failure 'change a few existing notes' '
+
+	git fast-import <input &&
+	GIT_NOTES_REF=refs/notes/many_notes git log -n3 refs/heads/many_commits |
+	    grep "^    " > actual &&
+	test_cmp expect actual
+
+'
+
+test_expect_failure 'verify that changing notes respect existing fanout' '
+
+	# None of the entries in the top-level notes tree should be a full SHA1
+	git ls-tree --name-only refs/notes/many_notes |
+	while read path
+	do
+		if test $(expr length "$path") -ge 40
+		then
+			return 1
+		fi
+	done
+
+'
+
 remaining_notes=10
 test_tick
 cat >input <<INPUT_END
-- 
1.7.5.rc1.3.g4d7b

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