user@pc:(main)~/test$ cmake -S . -B build/debug -DCMAKE_BUILD_TYPE=Debug  # -DENABLE_TESTING=OFF
Conan not setup, running conan build...
Configuration (profile_host):
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=9
os=Linux
os_build=Linux
[options]
[build_requires]
[env]

Configuration (profile_build):
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=9
os=Linux
os_build=Linux
[options]
[build_requires]
[env]

conanfile.txt: Installing package
Requirements
    doctest/2.4.8 from 'conancenter' - Cache
Packages
    doctest/2.4.8:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache

Installing (downloading, building) binaries...
doctest/2.4.8: Already installed!
conanfile.txt: Generator 'CMakeDeps' calling 'generate()'
conanfile.txt: Generator 'CMakeToolchain' calling 'generate()'
conanfile.txt: Generator txt created conanbuildinfo.txt
conanfile.txt: Aggregating env generators
conanfile.txt: Generated conaninfo.txt
conanfile.txt: Generated graphinfo
Using Conan toolchain through /root/test/build/debug/conan_toolchain.cmake.
-- The CXX compiler identification is GNU 9.3.0
-- Check for working CXX compiler: /usr/bin/c++
Using Conan toolchain through .
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
Using Conan toolchain through .
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: Target declared 'doctest::doctest'
-- Conan: Including build module from '/root/.conan/data/doctest/2.4.8/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib/cmake/doctest.cmake'
=====> ENABLE_TESTING: ON.
-- Configuring done
-- Generating done
-- Build files have been written to: /root/test/build/debug

user@pc:(main)~/test$ cmake --build build/debug
Scanning dependencies of target mainstatic
[ 20%] Building CXX object CMakeFiles/mainstatic.dir/source/code_with_tests.cpp.o
[ 20%] Built target mainstatic
Scanning dependencies of target main_tests
[ 40%] Building CXX object CMakeFiles/main_tests.dir/source/main_tests.cpp.o
[ 60%] Linking CXX executable main_tests
[ 60%] Built target main_tests
Scanning dependencies of target main
[ 80%] Building CXX object CMakeFiles/main.dir/source/main.cpp.o
[100%] Linking CXX executable main
[100%] Built target main

user@pc:(main)~/test$ ./build/debug/main
The root of 9 is 81.

user@pc:(main)~/test$ ./build/debug/main_tests
[doctest] doctest version is "2.4.8"
[doctest] run with "--help" for options
===============================================================================
[doctest] test cases: 1 | 1 passed | 0 failed | 0 skipped
[doctest] assertions: 2 | 2 passed | 0 failed |
[doctest] Status: SUCCESS!

user@pc:(main)~/test$