--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/tools/conftest.py	Fri Sep 15 19:45:41 2017 +0300
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# This file is part of Beremiz, a Integrated Development Environment for
+# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
+#
+# Copyright (C) 2017: Andrey Skvortsov
+#
+# See COPYING file for copyrights details.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+import os
+import sys
+import pytest
+import xvfbwrapper
+import time
+
+# append module root directory to sys.path
+sys.path.append(
+    os.path.abspath(
+        os.path.join(
+            os.path.dirname(__file__), '..', '..')
+    )
+)
+
+
+#
+# Something seems to be broken in Beremiz application,
+# because after tests in test_application.py during Xvfb shutdown
+# pytest returns error message:
+# pytest: Fatal IO error 11 (Die Ressource ist zur Zeit nicht verfügbar) on X server :2821.
+#
+# As a result of that pytest returns code 1 as some tests were failed,
+# but they aren't.
+#
+# To avoid this Xvfb is launched and killed not by pytest.
+# $ Xvfb :42 -screen 0 1280x1024x24 &
+# $ export DISPLAY=:42
+# $ pytest --timeout=10 ./tests/tools 
+# $ pkill -9 Xvfb
+#
+# TODO: find root of this problem.
+
+
+# vdisplay = None
+#
+# @pytest.fixture(scope="session", autouse=True)
+# def start_xvfb_server(request):
+#     global vdisplay
+#     vdisplay = xvfbwrapper.Xvfb(width=1280, height=720)
+#     vdisplay.start()
+#     request.addfinalizer(stop_xvfb_server)
+#
+# def stop_xvfb_server():
+#     if vdisplay is not None:
+#         vdisplay.stop()