diff --git a/hgitaly/tests/test_diff.py b/hgitaly/tests/test_diff.py
new file mode 100644
index 0000000000000000000000000000000000000000..f59a8c2c121c1e8c81f499a73def3b872a4ead06_aGdpdGFseS90ZXN0cy90ZXN0X2RpZmYucHk=
--- /dev/null
+++ b/hgitaly/tests/test_diff.py
@@ -0,0 +1,17 @@
+# Copyright 2021 Georges Racinet <georges.racinet@octobus.net>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from hgitaly.service.diff import (
+    CurrDiff,
+    Limits,
+    Parser,
+)
+
+
+def test_parser_corner_cases():
+    parser = Parser(Limits(), CurrDiff())
+    parser.parse([b""])