public void Should_clone_headers()
        {
            var headers = new EnvelopeHeaders(JsonValue.Object().Add("Key1", 123));

            var clone = headers.CloneHeaders();

            CompareHeaders(headers, clone);
        }
        public void Should_clone_headers()
        {
            var source = new EnvelopeHeaders
            {
                ["key1"] = JsonValue.Create(13)
            };

            var headers = source.CloneHeaders();

            CompareHeaders(headers, source);
        }