Add Catch2 and Google Test on Cmake

ToDo:
- Add compiling QElectroTech on Cmake (help needed)
- more Tests?
   - Qt Test
   - Boost Test

to test
run qtcreator
File >  open => CMakeLists.txt

tests/googletest/CMakeLists.txt

@@ -0,0 +1,61 @@
+# Copyright 2006 The QElectroTech Team
+# This file is part of QElectroTech.
+#
+# QElectroTech 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.
+#
+# QElectroTech 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 QElectroTech. If not, see <http://www.gnu.org/licenses/>.
+
+cmake_minimum_required(VERSION 3.5)
+
+message("_____________________________________________________________________")
+project(G_unittests LANGUAGES CXX)
+
+if(DEFINED ENV{QET_DIR})
+  set(QET_DIR "../..")
+  message("QET_DIR is not set, assuming QET is ../..")
+endif()
+
+message("PROJECT_NAME:       " ${PROJECT_NAME})
+message("PROJECT_SOURCE_DIR: " ${PROJECT_SOURCE_DIR})
+message("QET_DIR:            " ${QET_DIR})
+
+SET(CMAKE_CXX_STANDARD 17)
+
+find_package(Qt5Gui REQUIRED)
+find_package(Qt5Xml REQUIRED)
+find_package(Qt5Widgets REQUIRED)
+
+Include(FetchContent)
+
+FetchContent_Declare(
+  GTest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG        release-1.10.0)
+
+FetchContent_MakeAvailable(GTest)
+
+add_executable(
+    ${PROJECT_NAME}
+    tst_My_test.cpp
+    main.cpp
+    ${QET_DIR}/sources/borderproperties.h
+    ${QET_DIR}/sources/borderproperties.cpp)
+
+target_link_libraries(
+    ${PROJECT_NAME}
+    PUBLIC
+    gtest gtest_main
+    PRIVATE
+    Qt5::Gui
+    Qt5::Xml
+    Qt5::Widgets)
+