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After the source and test code are ready, the project can be built and compiled. At the top of the project's folder structure, add CMakeListCMakeLists.txt. The contents of the file are listed below:

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This is a simple setup for CMake builds, however it's important to get it right. At the beginning there are very basic lines that tell you the minimum CMake version required, the project name and the C++ standard used. Then the src directory is included and added. Next comes a very important line that enables testing and finally adds the tst directory as a subdirectory.

Then, in each subdirectory, another CMakeLists.txt file must be added accordingly. At first the ./src/CMakeLists.txt:

add_library(src operations.cpp operations.h)

add_executable(
        src_main main.cpp operations.cpp
)

target_sources(src
        PRIVATE
        main.cpp
        PUBLIC
        main.h
        )

target_include_directories(src
        PUBLIC
        .
        )

Last but not least, the ./tst/CMakeLists.txt file which is a bit more elaborate and needs some explanation:

include(FetchContent)
FetchContent_Declare(
        googletest
        URL https://github.com/google/googletest/archive/4ec4cd23f486bf70efcc5d2caa40f24368f752e3.zip
)
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(googletest)

add_executable(
        tests
        run_tests.cpp
        test_operations.cpp
)

target_link_libraries(tests
        PRIVATE
        src
        gtest_main
        )

# Auto-discovery of the tests
include(GoogleTest)
gtest_discover_tests(tests
        PROPERTIES
        LABELS "unit"
        DISCOVERY_TIMEOUT
        240)

Most importantly, it is the FetchContent function that downloads the GoogleTesting framework when building the project. It is recommended that you use the exact same URL listed above for the purpose of this tutorial, however in future use this URL may be changed to a different version available in the googletest repository.