--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "login-util.h"
+#include "string-util.h"
+#include "tests.h"
+
+TEST(session_id_valid) {
+ /* Invalid Session ID */
+ assert_se(!session_id_valid(""));
+ assert_se(!session_id_valid(NULL));
+ assert_se(!session_id_valid("abc-123"));
+ assert_se(!session_id_valid("abc_123"));
+ assert_se(!session_id_valid("abc123*"));
+
+ /* Valid Session ID */
+ assert_se(session_id_valid("abc123"));
+ assert_se(session_id_valid("AbCdEfG123456"));
+ assert_se(session_id_valid("1234567890"));
+ assert_se(session_id_valid("ABCDEFGHI"));
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);