diff --git a/src/tmpfiles/offline-passwd.c b/src/shared/offline-passwd.c
similarity index 100%
rename from src/tmpfiles/offline-passwd.c
rename to src/shared/offline-passwd.c
diff --git a/src/tmpfiles/offline-passwd.h b/src/shared/offline-passwd.h
similarity index 100%
rename from src/tmpfiles/offline-passwd.h
rename to src/shared/offline-passwd.h
diff --git a/src/test/meson.build b/src/test/meson.build
index d3fc803088..4affcd647f 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -301,6 +301,12 @@ tests += [
          [],
          []],
 
+        [['src/test/test-offline-passwd.c',
+          'src/shared/offline-passwd.c',
+          'src/shared/offline-passwd.h'],
+         [],
+         []],
+
         [['src/test/test-escape.c'],
          [],
          []],
diff --git a/src/test/test-offline-passwd.c b/src/test/test-offline-passwd.c
new file mode 100644
index 0000000000..5933ec28a3
--- /dev/null
+++ b/src/test/test-offline-passwd.c
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <getopt.h>
+
+#include "offline-passwd.h"
+#include "user-util.h"
+#include "format-util.h"
+#include "tests.h"
+
+static char *arg_root = NULL;
+
+static void test_resolve_one(const char *name) {
+        bool relaxed = name || arg_root;
+
+        if (!name)
+                name = "root";
+
+        log_info("/* %s(\"%s\") */", __func__, name);
+
+        _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
+        uid_t uid = UID_INVALID;
+        gid_t gid = GID_INVALID;
+        int r;
+
+        r = name_to_uid_offline(arg_root, name, &uid, &uid_cache);
+        log_info_errno(r, "name_to_uid_offline: %s → "UID_FMT": %m", name, uid);
+        assert_se(relaxed || r == 0);
+
+        r = name_to_uid_offline(arg_root, name, &uid, &uid_cache);
+        log_info_errno(r, "name_to_uid_offline: %s → "UID_FMT": %m", name, uid);
+        assert_se(relaxed || r == 0);
+
+        r = name_to_gid_offline(arg_root, name, &gid, &gid_cache);
+        log_info_errno(r, "name_to_gid_offline: %s → "GID_FMT": %m", name, gid);
+        assert_se(relaxed || r == 0);
+
+        r = name_to_gid_offline(arg_root, name, &gid, &gid_cache);
+        log_info_errno(r, "name_to_gid_offline: %s → "GID_FMT": %m", name, gid);
+        assert_se(relaxed || r == 0);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+        static const struct option options[] = {
+                { "root",           required_argument,   NULL, 'r' },
+                {}
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "r:", options, NULL)) >= 0)
+                switch(c) {
+                case 'r':
+                        arg_root = optarg;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached("Unhandled option");
+                }
+
+        return 0;
+}
+
+int main(int argc, char **argv) {
+        int r;
+
+        test_setup_logging(LOG_DEBUG);
+
+        r = parse_argv(argc, argv);
+        if (r < 0)
+                return r;
+
+        if (optind >= argc)
+                test_resolve_one(NULL);
+        else
+                while (optind < argc)
+                        test_resolve_one(argv[optind++]);
+
+        return 0;
+}
diff --git a/src/tmpfiles/meson.build b/src/tmpfiles/meson.build
index 2f8fb29bd9..434dcf800d 100644
--- a/src/tmpfiles/meson.build
+++ b/src/tmpfiles/meson.build
@@ -2,6 +2,6 @@
 
 systemd_tmpfiles_sources = [
         'src/tmpfiles/tmpfiles.c',
-        'src/tmpfiles/offline-passwd.c',
-        'src/tmpfiles/offline-passwd.h',
+        'src/shared/offline-passwd.c',
+        'src/shared/offline-passwd.h',
 ]