public void FileType_NetCore_Test() { SunamoMimeHelper.Init(); var f = @"d:\_Test\sunamo\win\Helpers\MImeHelper\GetMimeFromFile\Real"; //application/octet-stream> Assert.AreEqual("jpg", SunamoMimeHelper.FileType(TF.ReadAllBytes(f + AllExtensions.jpg).ToArray())); Assert.AreEqual("webp", SunamoMimeHelper.FileType(TF.ReadAllBytes(f + AllExtensions.webp).ToArray())); }