use catch2 main

unittest/rebootLogic/CMakeLists.txt

@@ -2,6 +2,21 @@ cmake_minimum_required(VERSION 3.0.0)
 project(reboot-logic VERSION 0.1.0)
 
 include(CTest)
+find_package(Catch2 3)
+if(NOT Catch2_FOUND)
+    include(FetchContent)
+
+    FetchContent_Declare(
+        Catch2
+        GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+        GIT_TAG        v3.0.0-preview4
+    )
+
+    FetchContent_MakeAvailable(Catch2)
+    #fixes regression -preview4, to be confirmed in later releases
+    set_target_properties(Catch2 PROPERTIES DEBUG_POSTFIX "")
+endif()
+
 enable_testing()
 
 add_executable(reboot-logic main.cpp)
@@ -14,6 +29,8 @@ target_sources(reboot-logic PRIVATE
     libxiphos.cpp
 )
 
+target_link_libraries(reboot-logic PRIVATE Catch2::Catch2WithMain)
+
 target_include_directories(reboot-logic PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
 )