test: regression test for n_directory_{get,set}_mtime

The mtime is cached, so closing the db is not a problem. Writing the
mtime throws an exception, which is caught.

1 files changed, 18 insertions, 0 deletions

diff --git a/test/T563-lib-directory.sh b/test/T563-lib-directory.sh
index 7e44e805..28325ff2 100755
--- a/test/T563-lib-directory.sh
+++ b/test/T563-lib-directory.sh
@@ -109,4 +109,22 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 restore_database
 
+backup_database
+test_begin_subtest "get/set mtime of directory for a closed db"
+cat c_head - c_tail <<'EOF' | test_C ${MAIL_DIR}
+    {
+        time_t stamp = notmuch_directory_get_mtime (dir);
+        stat = notmuch_directory_set_mtime (dir, stamp);
+        printf ("%d\n", stat == NOTMUCH_STATUS_XAPIAN_EXCEPTION);
+    }
+EOF
+cat <<EOF > EXPECTED
+== stdout ==
+1
+== stderr ==
+A Xapian exception occurred setting directory mtime: Database has been closed.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+restore_database
+
 test_done