Index: uspace/lib/ipcgfx/test/ipcgfx.c
===================================================================
--- uspace/lib/ipcgfx/test/ipcgfx.c	(revision afcf7049d7f35c862988f3e47d752144e2c6aaac)
+++ uspace/lib/ipcgfx/test/ipcgfx.c	(revision bac8acab303c7f157a739cc2c75ee38ac7f911c2)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2019 Jiri Svoboda
+ * Copyright (c) 2021 Jiri Svoboda
  * All rights reserved.
  *
@@ -52,4 +52,5 @@
 static errno_t test_gc_set_color(void *, gfx_color_t *);
 static errno_t test_gc_fill_rect(void *, gfx_rect_t *);
+static errno_t test_gc_update(void *);
 static errno_t test_gc_bitmap_create(void *, gfx_bitmap_params_t *,
     gfx_bitmap_alloc_t *, void **);
@@ -61,4 +62,5 @@
 	.set_color = test_gc_set_color,
 	.fill_rect = test_gc_fill_rect,
+	.update = test_gc_update,
 	.bitmap_create = test_gc_bitmap_create,
 	.bitmap_destroy = test_gc_bitmap_destroy,
@@ -80,4 +82,6 @@
 	bool fill_rect_called;
 	gfx_rect_t fill_rect_rect;
+
+	bool update_called;
 
 	bool bitmap_create_called;
@@ -292,4 +296,86 @@
 	PCUT_ASSERT_EQUALS(rect.p1.x, resp.fill_rect_rect.p1.x);
 	PCUT_ASSERT_EQUALS(rect.p1.y, resp.fill_rect_rect.p1.y);
+
+	ipc_gc_delete(ipcgc);
+	async_hangup(sess);
+
+	rc = loc_service_unregister(sid);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** gfx_update with server returning failure */
+PCUT_TEST(update_failure)
+{
+	errno_t rc;
+	service_id_t sid;
+	test_response_t resp;
+	gfx_context_t *gc;
+	async_sess_t *sess;
+	ipc_gc_t *ipcgc;
+
+	async_set_fallback_port_handler(test_ipcgc_conn, &resp);
+
+	// FIXME This causes this test to be non-reentrant!
+	rc = loc_server_register(test_ipcgfx_server);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = loc_service_register(test_ipcgfx_svc, &sid);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	sess = loc_service_connect(sid, INTERFACE_GC, 0);
+	PCUT_ASSERT_NOT_NULL(sess);
+
+	rc = ipc_gc_create(sess, &ipcgc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	gc = ipc_gc_get_ctx(ipcgc);
+	PCUT_ASSERT_NOT_NULL(gc);
+
+	resp.rc = ENOMEM;
+	resp.update_called = false;
+	rc = gfx_update(gc);
+	PCUT_ASSERT_ERRNO_VAL(resp.rc, rc);
+	PCUT_ASSERT_TRUE(resp.update_called);
+
+	ipc_gc_delete(ipcgc);
+	async_hangup(sess);
+
+	rc = loc_service_unregister(sid);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** gfx_update with server returning success */
+PCUT_TEST(update_success)
+{
+	errno_t rc;
+	service_id_t sid;
+	test_response_t resp;
+	gfx_context_t *gc;
+	async_sess_t *sess;
+	ipc_gc_t *ipcgc;
+
+	async_set_fallback_port_handler(test_ipcgc_conn, &resp);
+
+	// FIXME This causes this test to be non-reentrant!
+	rc = loc_server_register(test_ipcgfx_server);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = loc_service_register(test_ipcgfx_svc, &sid);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	sess = loc_service_connect(sid, INTERFACE_GC, 0);
+	PCUT_ASSERT_NOT_NULL(sess);
+
+	rc = ipc_gc_create(sess, &ipcgc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	gc = ipc_gc_get_ctx(ipcgc);
+	PCUT_ASSERT_NOT_NULL(gc);
+
+	resp.rc = EOK;
+	resp.update_called = false;
+	rc = gfx_update(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_TRUE(resp.update_called);
 
 	ipc_gc_delete(ipcgc);
@@ -847,4 +933,18 @@
 }
 
+/** Update test GC.
+ *
+ * @param arg Test GC
+ *
+ * @return EOK on success or an error code
+ */
+static errno_t test_gc_update(void *arg)
+{
+	test_response_t *resp = (test_response_t *) arg;
+
+	resp->update_called = true;
+	return resp->rc;
+}
+
 /** Create bitmap in test GC.
  *