public void ShouldWriteColumns()
        {
            var mapping = new IndexMapping { IsManyToMany = true };

            mapping.AddColumn(new ColumnMapping());

            writer.VerifyXml(mapping)
                .Element("column").Exists();
        }
        public void ShouldWriteColumns()
        {
            var mapping = new IndexMapping();

            mapping.AddColumn(Layer.Defaults, new ColumnMapping());

            writer.VerifyXml(mapping)
                .Element("column").Exists();
        }