pub fn test_download_with_progress_and_config<F>(
server: &SpeedTestServer,
progress_callback: F,
config: &mut SpeedTestConfig
) -> Result<SpeedMeasurement, SpeedTestError>
pub fn test_download_with_progress_and_config<F>(
server: &SpeedTestServer,
progress_callback: F,
config: &mut SpeedTestConfig
) -> Result<SpeedMeasurement, SpeedTestError>