cmake_minimum_required(VERSION 3.1) project(TestPython C) include(CTest) find_package(Python 3 REQUIRED COMPONENTS Interpreter Development) if (NOT Python_FOUND) message (FATAL_ERROR "Fail to found Python 3") endif() Python_add_library (spam3 MODULE ../spam.c) target_compile_definitions (spam3 PRIVATE PYTHON3) add_test (NAME python_spam3 COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$" "${Python_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")