# ---[ Google Test
if(NOT GTEST_ROOT)
    if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/googletest")
        add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/googletest")
        set(GTEST_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/googletest")
        set(GTEST_BOTH_LIBRARIES gtest gtest_main)
        set(GTEST_FOUND ON)
    elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/gtest")
        add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/gtest")
        set(GTEST_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/gtest")
        set(GTEST_BOTH_LIBRARIES gtest gtest_main)
        set(GTEST_FOUND ON)
    else()
        find_package(GTest)
    endif()
endif()

if(GTEST_FOUND)
    if (UNIX)
        SET(CMAKE_EXE_LINKER_FLAGS "-pthread")
    endif(UNIX)
    enable_testing()
    find_package(Threads REQUIRED)
    file(GLOB_RECURSE UNIT_TEST_SOURCE "*.cc")
    include_directories(cpp/include)
    include_directories(${GTEST_INCLUDE_DIRS})
    add_executable(${PROJECT_NAME}_unit_tests ${UNIT_TEST_SOURCE})
    set_property(TARGET ${PROJECT_NAME}_unit_tests
            PROPERTY RUNTIME_OUTPUT_DIRECTORY ${PRIVATE_RUNTIME_DIR})
    target_link_libraries(${PROJECT_NAME}_unit_tests
            ${GTEST_LIBRARIES}
            dmlc
            Threads::Threads
            )
    add_test(AllTestsIn${PROJECT_NAME}UnitTests ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${PROJECT_NAME}_unit_tests)
else()
    message(WARNING "Google Test not found")
endif()