public async void DrawCaptchaFileTest()
{
var captcha = string.Empty;
RandomUtility.Run(r =>
{
captcha = _captchas[r.Next(0, _captchas.Length)];
});
var saveFile = "captcha.png".AsFilePathCombiner(_service.Dependency.ResourceDirectory);
var result = await _service.DrawFileAsync(captcha, saveFile).ConfigureAwait();
Assert.True(result);
}