IronRuby.Tests.Tests.MutableString_Translate1 C# (CSharp) Method

        public void MutableString_Translate1() {
            var SJIS = RubyEncoding.GetRubyEncoding(RubyEncoding.CodePageSJIS);
            var sjis = new byte[] { 0x82, 0xA0 };
            var u12345 = new byte[] { 0xF0, 0x92, 0x8D, 0x85 }; // \u{12345} in UTF-8
            Test_Translate(
                Utf8("αβγδ"), RubyEncoding.UTF8,
                Utf8("α-γ"), RubyEncoding.UTF8, 
                Utf8("AB"), SJIS,
                Utf8("ABBδ"), RubyEncoding.UTF8
            );

            Test_Translate(
                Utf8("αaβzγcδ"), RubyEncoding.UTF8,
                Utf8("a-z"), RubyEncoding.Binary,
                Utf8("*"), SJIS,
                Utf8("α*β*γ*δ"), RubyEncoding.UTF8
            );

            Test_Translate(
                Utf8("αaβzγcδ"), RubyEncoding.UTF8,
                Utf8("^α-δ"), RubyEncoding.UTF8,
                Utf8("-"), SJIS,
                Utf8("α-β-γ-δ"), RubyEncoding.UTF8
            );
            
            Test_Translate(
                Utf8("-α-"), RubyEncoding.Binary,
                Utf8("α"), RubyEncoding.Binary,
                Utf8("AB"), RubyEncoding.Binary,
                Utf8("-AB-"), RubyEncoding.Binary
            );

            Test_Translate(
                Utf8("-a-"), SJIS,
                Utf8("a"), RubyEncoding.Binary,
                Utf8("A"), RubyEncoding.UTF8,
                Utf8("-A-"), SJIS
            );

            Test_Translate(
               Utf8("a"), RubyEncoding.UTF8,
               Utf8("a"), RubyEncoding.UTF8,
               Utf8("\0"), RubyEncoding.UTF8,
               Utf8("\0"), RubyEncoding.UTF8
           );

            AssertExceptionThrown<EncodingCompatibilityError>(
                () => Test_Translate(Utf8("α"), RubyEncoding.Binary, Utf8("α"), RubyEncoding.UTF8, Utf8("-"), SJIS, null, null)
            );

            AssertExceptionThrown<EncodingCompatibilityError>(
                () => Test_Translate(Utf8("α"), RubyEncoding.UTF8, Sjis("ﾎ"), SJIS, Utf8("-"), SJIS, null, null)
            );

            // correctly switches to char repr and invalidates hashcode:
            MutableString self, from, to, result;
            int h1, h2;

            self = MutableString.CreateBinary(Utf8("aAaBa"), RubyEncoding.UTF8);
            from = MutableString.Create("a", RubyEncoding.UTF8);
            to = MutableString.Create("α", RubyEncoding.UTF8);
            result = MutableString.Create("αAαBα", RubyEncoding.UTF8);

            MutableStringOps.Translate(self, from, to);

            h1 = self.GetHashCode();
            h2 = result.GetHashCode();
            Assert(h1 == h2);
            Assert(self.ToString() == "αAαBα");
        }