diff --git a/src/test/meson.build b/src/test/meson.build
index b57ba23539..ab0f091756 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -93,6 +93,7 @@ simple_tests += files(
         'test-fstab-util.c',
         'test-glob-util.c',
         'test-gpt.c',
+        'test-gunicode.c',
         'test-hash-funcs.c',
         'test-hexdecoct.c',
         'test-hmac.c',
diff --git a/src/test/test-gunicode.c b/src/test/test-gunicode.c
new file mode 100644
index 0000000000..1836cdc04a
--- /dev/null
+++ b/src/test/test-gunicode.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "gunicode.h"
+#include "tests.h"
+#include "utf8.h"
+
+TEST(unichar_iswide) {
+        char32_t c;
+        int r;
+
+        /* FIXME: the cats are wide, but we get this wrong */
+        for (const char *narrow = "abX_…ąęµ!" "😼😿🙀😸😻"; *narrow; narrow += r) {
+                r = utf8_encoded_to_unichar(narrow, &c);
+                bool w = unichar_iswide(c);
+                assert_se(r > 0);
+                assert_se(!w);
+        }
+
+        for (const char *wide = "🐱／￥"; *wide; wide += r) {
+                r = utf8_encoded_to_unichar(wide, &c);
+                bool w = unichar_iswide(c);
+                assert_se(r > 0);
+                assert_se(w);
+        }
+}
+
+DEFINE_TEST_MAIN(LOG_INFO);