IronRuby.Tests.Tests.MutableString_IsAscii C# (CSharp) Method

        public void MutableString_IsAscii() {
            MutableString a;
            byte[] b;

            foreach (var e in new[] { RubyEncoding.Binary, RubyEncoding.SJIS, RubyEncoding.EUCJP, RubyEncodingOps.ISO_8859_15 }) {
                a = MutableString.CreateBinary(new byte[] { 0x12, 0x34, 0x56 }, e);
                Assert(a.IsAscii());
                a.Remove(2);
                Assert(a.IsAscii());
                a.Append(0x56);
                Assert(a.IsAscii());
                a.Append(0x80);
                Assert(!a.IsAscii());
                a.ConvertToString();
                Assert(!a.IsAscii());
                a.Remove(2);
                Assert(a.IsAscii());
            }

            b = Encoding.Unicode.GetBytes("hello");

            // non-ascii-identity encodings:
            foreach (var e in new[] { RubyEncodingOps.UTF_16BE, RubyEncodingOps.UTF_16LE, RubyEncodingOps.UTF_32LE, RubyEncodingOps.UTF_32BE }) {
                a = MutableString.CreateBinary(b, e);
                Assert(!a.IsAscii());

                a = MutableString.CreateMutable("hello", e);
                Assert(!a.IsAscii());

                a = MutableString.Create("hello", e);
                Assert(!a.IsAscii());
            }
        }