IronRuby.Tests.Tests.MutableString_Surrogates1 C# (CSharp) Method

        public void MutableString_Surrogates1() {
            MutableString x;

            // encoding doesn't produce surrogate characters //

            foreach (var e in new[] { RubyEncoding.Binary, RubyEncoding.Ascii }) {
                x = MutableString.Create("", e);
                Assert(x.KnowsSurrogates);
                Assert(!x.HasSurrogates());
                Assert(x.KnowsSurrogates);

                x = MutableString.CreateMutable("", e);
                Assert(x.KnowsSurrogates);
                Assert(!x.HasSurrogates());
                Assert(x.KnowsSurrogates);
            }

            // encoding might produce surrogate characters //

            foreach (var e in new[] { RubyEncoding.UTF8, RubyEncodingOps.UTF_16BE, RubyEncodingOps.UTF_32LE }) {
                foreach (var str in new[] { "", "x", "xy", "hello world", "\uD7FF", "\uE000" }) {
                    x = MutableString.Create(str, e);
                    Assert(!x.KnowsSurrogates);
                    Assert(!x.HasSurrogates());
                    Assert(x.KnowsSurrogates);

                    x = MutableString.CreateMutable(str, e);
                    Assert(!x.KnowsSurrogates);
                    Assert(!x.HasSurrogates());
                    Assert(x.KnowsSurrogates);
                }

                foreach (var str in new[] { "\uD800", "\uD800a", "a\uD800", "\uDFFF" }) {
                    x = MutableString.Create(str, e);
                    Assert(!x.KnowsSurrogates);
                    Assert(x.HasSurrogates());
                    Assert(x.KnowsSurrogates);

                    x = MutableString.CreateMutable(str, e);
                    Assert(!x.KnowsSurrogates);
                    Assert(x.HasSurrogates());
                    Assert(x.KnowsSurrogates);
                }
            }
        }