diff --git a/src/libsystemd/sd-device/test-sd-device.c b/src/libsystemd/sd-device/test-sd-device.c
index 9f48d2bf1e..fd30d1a1d0 100644
--- a/src/libsystemd/sd-device/test-sd-device.c
+++ b/src/libsystemd/sd-device/test-sd-device.c
@@ -1,9 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include "device-enumerator-private.h"
+#include "device-internal.h"
 #include "device-private.h"
 #include "device-util.h"
 #include "hashmap.h"
+#include "nulstr-util.h"
 #include "string-util.h"
 #include "tests.h"
 #include "time-util.h"
@@ -161,6 +163,47 @@ static void test_sd_device_enumerator_filter_subsystem(void) {
         assert_se(n_new_dev <= 10);
 }
 
+static void test_sd_device_new_from_nulstr(void) {
+        const char *devlinks =
+                "/dev/disk/by-partuuid/1290d63a-42cc-4c71-b87c-xxxxxxxxxxxx\0"
+                "/dev/disk/by-path/pci-0000:00:0f.0-scsi-0:0:0:0-part3\0"
+                "/dev/disk/by-label/Arch\\x20Linux\0"
+                "/dev/disk/by-uuid/a07b87e5-4af5-4a59-bde9-yyyyyyyyyyyy\0"
+                "/dev/disk/by-partlabel/Arch\\x20Linux\0"
+                "\0";
+
+        _cleanup_(sd_device_unrefp) sd_device *device = NULL, *from_nulstr = NULL;
+        _cleanup_free_ uint8_t *nulstr_copy = NULL;
+        const char *devlink;
+        const uint8_t *nulstr;
+        size_t len;
+
+        log_info("/* %s */", __func__);
+
+        assert_se(sd_device_new_from_syspath(&device, "/sys/class/net/lo") >= 0);
+
+        /* Yeah, of course, setting devlink to the loopback interface is nonsense. But this is just a
+         * test for generating and parsing nulstr. For issue #17772. */
+        NULSTR_FOREACH(devlink, devlinks) {
+                log_device_info(device, "setting devlink: %s", devlink);
+                assert_se(device_add_devlink(device, devlink) >= 0);
+                assert_se(set_contains(device->devlinks, devlink));
+        }
+
+        /* These properties are necessary for device_new_from_nulstr(). See device_verify(). */
+        assert_se(device_add_property_internal(device, "SEQNUM", "1") >= 0);
+        assert_se(device_add_property_internal(device, "ACTION", "change") >= 0);
+
+        assert_se(device_get_properties_nulstr(device, &nulstr, &len) >= 0);
+        assert_se(nulstr_copy = newdup(uint8_t, nulstr, len));
+        assert_se(device_new_from_nulstr(&from_nulstr, nulstr_copy, len) >= 0);
+
+        NULSTR_FOREACH(devlink, devlinks) {
+                log_device_info(from_nulstr, "checking devlink: %s", devlink);
+                assert_se(set_contains(from_nulstr->devlinks, devlink));
+        }
+}
+
 int main(int argc, char **argv) {
         test_setup_logging(LOG_INFO);
 
@@ -168,5 +211,7 @@ int main(int argc, char **argv) {
         test_sd_device_enumerator_subsystems();
         test_sd_device_enumerator_filter_subsystem();
 
+        test_sd_device_new_from_nulstr();
+
         return 0;
 }