public async void GetDownload_Test()
{
var r = await Controller.GetDownload("123-Mock-321");
Assert.True(r is FileStreamResult, $"r should be FileStreamResult, not {r.GetType().Name}");
var Result = r as FileStreamResult;
Assert.NotNull(Result);
Assert.Equal("application/pdf", Result.ContentType);
Assert.Matches("Issues-.{4}-.{2}-.{2}.pdf", Result.FileDownloadName);
await using (var ms = new MemoryStream())
{
await Result.FileStream.CopyToAsync(ms);
Assert.Equal("file 123-Mock-321.pdf content", Encoding.UTF8.GetString(ms.ToArray()));
}
}