test: add known broken test for closing with open transaction

The expected output may need adjusting, but what is clear is that
saving none of the changes is not desirable.

test/T385-transactions.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+test_description='transactions'
+. $(dirname "$0")/test-lib.sh || exit 1
+
+make_shim no-close <<EOF
+#include <notmuch.h>
+#include <stdio.h>
+notmuch_status_t
+notmuch_database_close (notmuch_database_t *notmuch)
+{
+  return notmuch_database_begin_atomic (notmuch);
+}
+EOF
+
+for i in `seq 1 1024`
+do
+    generate_message '[subject]="'"subject $i"'"' \
+	             '[body]="'"body $i"'"'
+done
+
+test_begin_subtest "initial new"
+NOTMUCH_NEW > OUTPUT
+cat <<EOF > EXPECTED
+Added 1024 new messages to the database.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "Some changes saved with open transaction"
+test_subtest_known_broken
+notmuch config set database.autocommit 1000
+rm -r ${MAIL_DIR}/.notmuch
+notmuch_with_shim no-close new
+output=$(notmuch count '*')
+test_expect_equal "$output" "1000"
+
+test_done