public void MutableString_ValidEncoding1() {
var str = MutableString.CreateBinary(Encoding.UTF8.GetBytes("\u0081"), RubyEncoding.SJIS);
Assert(str.ContainsInvalidCharacters());
str = MutableString.CreateMutable("\u0081", RubyEncoding.SJIS);
Assert(str.ContainsInvalidCharacters());
str = MutableString.CreateMutable("hello", RubyEncoding.SJIS);
Assert(!str.ContainsInvalidCharacters());
str = MutableString.CreateMutable("ホア", RubyEncoding.SJIS);
Assert(!str.ContainsInvalidCharacters());
}
}