public void ReadAllBytesTest()
        {
            var path = @"z:\temp\aaa.txt";
            var text = "あいうえお";
            var encoding = Encoding.GetEncoding("shift-jis");

            var file = new FileEmu();
            file.AddFile(path, text, encoding);

            byte[] data = file.ReadAllBytes(path);

            Assert.AreEqual(text, encoding.GetString(data));
        }