code: // This file is part of OpenCV project.
  // It is subject to the license terms in the LICENSE file found in the top-level directory
  // of this distribution and at http://opencv.org/license.html.
  #include "test_precomp.hpp"
  #include <opencv2/core/utils/logger.hpp>
  
  #if defined(HAVE_HPX)
      #include <hpx/hpx_main.hpp>
  #endif
  
  static
  void initTests()
  {
  #ifndef WINRT  // missing getenv
      const std::vector<cv::VideoCaptureAPIs> backends = cv::videoio_registry::getStreamBackends();
      const char* requireFFmpeg = getenv("OPENCV_TEST_VIDEOIO_BACKEND_REQUIRE_FFMPEG");
      if (requireFFmpeg && !isBackendAvailable(cv::CAP_FFMPEG, backends))
      {
          CV_LOG_FATAL(NULL, "OpenCV-Test: required FFmpeg backend is not available (broken plugin?). STOP.");
          exit(1);
      }
  #endif
  }
  
  CV_TEST_MAIN("highgui", initTests())
  