public async Task GetExtensionFromMimeType()
        {
            var downloader = new MimeTyper();
            var ext        = await downloader.GetExtensionFromMimeType("image/jpeg");

            Assert.Equal("jpeg", ext);
        }
        public async Task FileStorageGetExtensionFromMimeType()
        {
            var downloader = new MimeTyper(true, MimeTyperLoadMode.File);
            var ext        = await downloader.GetExtensionFromMimeType("image/jpeg");

            Assert.Equal("jpeg", ext);
        }
        public async Task FileStorageGetCustomExtensionFromMimeType()
        {
            var downloader = new MimeTyper(true, MimeTyperLoadMode.File);
            await downloader.AddCustomMimeType(new MimeTyperItem { Extension = "purple", MimeType = "application/purplesoft-io" });

            var ext = await downloader.GetExtensionFromMimeType("application/purplesoft-io");

            Assert.Equal("purple", ext);
        }