text: #include "doctest.h"
  
  #include <gpcl/pid_file.hpp>
  #include <gpcl/once_flag.hpp>
  
  static gpcl::once_flag once;
  
  #if defined(GPCL_POSIX)
  TEST_CASE("pid_file")
  {
    gpcl::call_once(once, [] {
      gpcl::pid_file lock("hello.lock");
    });
  }
  #endif
  