diff --git a/tests/api-test-2.c b/tests/api-test-2.c
index 445a12e8..32e6c368 100644
--- a/tests/api-test-2.c
+++ b/tests/api-test-2.c
@@ -3323,8 +3323,10 @@ static void Luks2Requirements(void)
 
 	/* crypt_get_label (unrestricted) */
 	NOTNULL_(crypt_get_label(cd));
+	OK_(strcmp("", crypt_get_label(cd)));
 	/* crypt_get_subsystem (unrestricted) */
 	NOTNULL_(crypt_get_subsystem(cd));
+	OK_(strcmp("", crypt_get_subsystem(cd)));
 
 	/* crypt_repair (with current repair capabilities it's unrestricted) */
 	OK_(crypt_repair(cd, CRYPT_LUKS2, NULL));
@@ -3807,6 +3809,15 @@ static void Luks2Flags(void)
 	OK_(crypt_persistent_flags_get(cd, CRYPT_FLAGS_ACTIVATION, &flags));
 	EQ_(flags,CRYPT_ACTIVATE_ALLOW_DISCARDS | CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS);
 
+	/* label and subsystem (second label */
+	OK_(crypt_set_label(cd, "label", "subsystem"));
+	OK_(strcmp("label", crypt_get_label(cd)));
+	OK_(strcmp("subsystem", crypt_get_subsystem(cd)));
+
+	OK_(crypt_set_label(cd, NULL, NULL));
+	OK_(strcmp("", crypt_get_label(cd)));
+	OK_(strcmp("", crypt_get_subsystem(cd)));
+
 	CRYPT_FREE(cd);
 }
 
diff --git a/tests/api-test.c b/tests/api-test.c
index a789bab0..269171ce 100644
--- a/tests/api-test.c
+++ b/tests/api-test.c
@@ -604,6 +604,9 @@ static void AddDevicePlain(void)
 	FAIL_(crypt_keyslot_add_by_keyfile(cd,CRYPT_ANY_SLOT,KEYFILE1,strlen(KEY1),KEYFILE2,strlen(KEY2)),"can't add keyslot to plain device");
 	FAIL_(crypt_keyslot_destroy(cd,1),"can't manipulate keyslots on plain device");
 	EQ_(crypt_keyslot_status(cd, 0), CRYPT_SLOT_INVALID);
+	FAIL_(crypt_set_label(cd, "label", "subsystem"), "can't set labels for plain device");
+	NULL_(crypt_get_label(cd));
+	NULL_(crypt_get_subsystem(cd));
 	_remove_keyfiles();
 
 	CRYPT_FREE(cd);
@@ -1036,6 +1039,10 @@ static void AddDeviceLuks(void)
 	OK_(crypt_set_uuid(cd, DEVICE_TEST_UUID));
 	OK_(strcmp(DEVICE_TEST_UUID, crypt_get_uuid(cd)));
 
+	FAIL_(crypt_set_label(cd, "label", "subsystem"), "can't set labels for LUKS1 device");
+	NULL_(crypt_get_label(cd));
+	NULL_(crypt_get_subsystem(cd));
+
 	FAIL_(crypt_deactivate(cd, CDEVICE_2), "not active");
 	CRYPT_FREE(cd);