System.Web.HttpContext.AddError C# (CSharp) Method

		public void AddError (Exception errorInfo)
		{
			if (errors == null){
				errors = errorInfo;
				return;
			}
			ArrayList l;
			if (errors is Exception){
				l = new ArrayList ();
				l.Add (errors);
				errors = l;
			} else 
				l = (ArrayList) errors;
			l.Add (errorInfo);
		}

        public void EncodeError_FromHttpContext()
        {
            // setup
            const string url = "http://myserver.com/site/page?param=value";
            var x = new HttpContext(new HttpRequest("file", url, "param=value"), new HttpResponse(TextWriter.Null));
            var guid = Guid.NewGuid();
            x.Items.Add("loggingId", guid);
            const string msg = "booboo";
            Exception exc;
            try
            {
                throw new Exception(msg); // to get a stack trace
            }
            catch (Exception ex)
            {
                exc = ex;
            }
            x.AddError(exc);

            // test
            var res = ServerErrorHttpModule.EncodeError(x);

            // sense
            var dec = Encoding.UTF8.GetString(Convert.FromBase64String(res));
            Assert.False(string.IsNullOrEmpty(dec));
            var parts = dec.Split(ServerErrorHttpModule.ErrorSepChar);
            Assert.Equal(4, parts.Length);
            Assert.True(parts.Contains(guid.ToString()));
            Assert.True(parts.Contains(url));
            Assert.True(parts.Contains(msg));
            Assert.Equal(1, parts.Count(p => p.Contains("EncodeError_FromHttpContext")));
        }