diff --git a/src/test/meson.build b/src/test/meson.build
index 426a54fd29..e9e9463790 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -119,6 +119,7 @@ simple_tests += files(
         'test-lock-util.c',
         'test-log.c',
         'test-logarithm.c',
+        'test-login-util.c',
         'test-macro.c',
         'test-memfd-util.c',
         'test-memory-util.c',
diff --git a/src/test/test-login-util.c b/src/test/test-login-util.c
new file mode 100644
index 0000000000..2d20e234ef
--- /dev/null
+++ b/src/test/test-login-util.c
@@ -0,0 +1,22 @@
+/* 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);