public void AppendAllText_FileExist_ReturnAppendedFile()
{
_path = "player.json";
string firstcontent = "player****";
_target.WriteFileData(_path, firstcontent);
string content = "volley";
_target.AppendAllText(_path, content);
_expectedString = "player****volley";
var actual = _target.ReadFileData(_path);
Assert.AreEqual(_expectedString, actual);
}
