object DomTestUtil {
    fun printDomByTraversal(
        document: DeclarativeDocument,
        nodeFormatter: (DocumentNode) -> String,
        valueFormatter: (ValueNode) -> String
    ): String = buildString {
        fun visitValue(valueNode: ValueNode, indent: Int) {
            append(" ".repeat(indent * 4))
            append(valueFormatter(valueNode))
        }

        fun visitDocumentNode(documentNode: DocumentNode, indent: Int) {