add testing infrastructure

CMakeLists.txt

@@ -1,5 +1,5 @@
 
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.23)
 
 project(maiden)
 
@@ -8,18 +8,40 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_INSTALL_PREFIX ${PROJECT_SOURCE_DIR})
 
+# gtest
+include(FetchContent)
+FetchContent_Declare(
+    googletest
+    GIT_REPOSITORY https://github.com/google/googletest.git
+    GIT_TAG        v1.17.x  # Use a specific version tag or commit hash
+)
+FetchContent_MakeAvailable(googletest)
+
 # add_subdirectory() to nest CMakeLists
 
 add_executable(maiden
+    src/App.cpp
     src/main.cpp
     # include extra source files here
 )
 
+add_executable(maiden_test
+    src/App.cpp
+    test/TestApp.cpp
+)
+
 target_include_directories(maiden PRIVATE
     "${CMAKE_CURRENT_SOURCE_DIR}/src"
     # add additional include directories here
 )
 
-target_link_libraries(maiden PRIVATE
-    # add libraries here
+target_include_directories(maiden_test PRIVATE
+    "${CMAKE_CURRENT_SOURCE_DIR}/src"
 )
+
+target_link_libraries(maiden_test PRIVATE
+    GTest::gmock_main
+)
+
+include(GoogleTest)
+gtest_discover_tests(maiden_test)