Index: uspace/lib/dispcfg/src/testdc.c
===================================================================
--- uspace/lib/dispcfg/src/testdc.c	(revision acd7ac27615c878223fa2b8f1f6c1bdbd38cd3e3)
+++ uspace/lib/dispcfg/src/testdc.c	(revision acd7ac27615c878223fa2b8f1f6c1bdbd38cd3e3)
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2023 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libdispcfg
+ * @{
+ */
+/**
+ * @file
+ * @brief Display configuration test service
+ */
+
+#include <errno.h>
+#include <dispcfg.h>
+#include <dispcfg_srv.h>
+#include <fibril_synch.h>
+#include <str.h>
+#include <testdc.h>
+
+static errno_t test_get_seat_list(void *, dispcfg_seat_list_t **);
+static errno_t test_get_seat_info(void *, sysarg_t, dispcfg_seat_info_t **);
+static errno_t test_seat_create(void *, const char *, sysarg_t *);
+static errno_t test_seat_delete(void *, sysarg_t);
+static errno_t test_dev_assign(void *, sysarg_t, sysarg_t);
+static errno_t test_dev_unassign(void *, sysarg_t);
+static errno_t test_get_asgn_dev_list(void *, sysarg_t, dispcfg_dev_list_t **);
+static errno_t test_get_event(void *, dispcfg_ev_t *);
+
+static void test_seat_added(void *, sysarg_t);
+static void test_seat_removed(void *, sysarg_t);
+
+static dispcfg_ops_t test_dispcfg_srv_ops = {
+	.get_seat_list = test_get_seat_list,
+	.get_seat_info = test_get_seat_info,
+	.seat_create = test_seat_create,
+	.seat_delete = test_seat_delete,
+	.dev_assign = test_dev_assign,
+	.dev_unassign = test_dev_unassign,
+	.get_asgn_dev_list = test_get_asgn_dev_list,
+	.get_event = test_get_event
+};
+
+dispcfg_cb_t test_dispcfg_cb = {
+	.seat_added = test_seat_added,
+	.seat_removed = test_seat_removed
+};
+
+/** Test seat management service connection. */
+void test_dispcfg_conn(ipc_call_t *icall, void *arg)
+{
+	test_response_t *resp = (test_response_t *) arg;
+	dispcfg_srv_t srv;
+
+	/* Set up protocol structure */
+	dispcfg_srv_initialize(&srv);
+	srv.ops = &test_dispcfg_srv_ops;
+	srv.arg = arg;
+	resp->srv = &srv;
+
+	/* Handle connection */
+	dispcfg_conn(icall, &srv);
+
+	resp->srv = NULL;
+}
+
+static void test_seat_added(void *arg, sysarg_t seat_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->revent.etype = dcev_seat_added;
+
+	fibril_mutex_lock(&resp->event_lock);
+	resp->seat_added_called = true;
+	resp->seat_added_seat_id = seat_id;
+	fibril_condvar_broadcast(&resp->event_cv);
+	fibril_mutex_unlock(&resp->event_lock);
+}
+
+static void test_seat_removed(void *arg, sysarg_t seat_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->revent.etype = dcev_seat_removed;
+
+	fibril_mutex_lock(&resp->event_lock);
+	resp->seat_removed_called = true;
+	resp->seat_removed_seat_id = seat_id;
+	fibril_condvar_broadcast(&resp->event_cv);
+	fibril_mutex_unlock(&resp->event_lock);
+}
+
+static errno_t test_get_seat_list(void *arg, dispcfg_seat_list_t **rlist)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->get_seat_list_called = true;
+
+	if (resp->rc != EOK)
+		return resp->rc;
+
+	*rlist = resp->get_seat_list_rlist;
+	return EOK;
+}
+
+static errno_t test_get_seat_info(void *arg, sysarg_t seat_id,
+    dispcfg_seat_info_t **rinfo)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->get_seat_info_called = true;
+	resp->get_seat_info_seat_id = seat_id;
+
+	if (resp->rc != EOK)
+		return resp->rc;
+
+	*rinfo = resp->get_seat_info_rinfo;
+	return EOK;
+}
+
+static errno_t test_seat_create(void *arg, const char *name, sysarg_t *rseat_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->seat_create_called = true;
+	resp->seat_create_name = str_dup(name);
+	*rseat_id = resp->seat_create_seat_id;
+	return resp->rc;
+}
+
+static errno_t test_seat_delete(void *arg, sysarg_t seat_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->seat_delete_called = true;
+	resp->seat_delete_seat_id = seat_id;
+	return resp->rc;
+}
+
+static errno_t test_dev_assign(void *arg, sysarg_t svc_id, sysarg_t seat_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->dev_assign_called = true;
+	resp->dev_assign_svc_id = svc_id;
+	resp->dev_assign_seat_id = seat_id;
+	return resp->rc;
+}
+
+static errno_t test_dev_unassign(void *arg, sysarg_t svc_id)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->dev_unassign_called = true;
+	resp->dev_unassign_svc_id = svc_id;
+	return resp->rc;
+}
+
+static errno_t test_get_asgn_dev_list(void *arg, sysarg_t seat_id,
+    dispcfg_dev_list_t **rlist)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->get_asgn_dev_list_called = true;
+	resp->get_asgn_dev_list_seat_id = seat_id;
+
+	if (resp->rc != EOK)
+		return resp->rc;
+
+	*rlist = resp->get_asgn_dev_list_rlist;
+	return EOK;
+}
+
+static errno_t test_get_event(void *arg, dispcfg_ev_t *event)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->get_event_called = true;
+	if (resp->event_cnt > 0) {
+		--resp->event_cnt;
+		*event = resp->event;
+		return EOK;
+	}
+
+	return ENOENT;
+}
+
+/** @}
+ */