diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php b/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
index e124e2dd7ade1..94acc4cde4d79 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
@@ -183,6 +183,7 @@ public static function build_html5_treelike_string( $fragment_context, $html ) {
 
 					break;
 
+				case '#cdata-section':
 				case '#text':
 					$output .= str_repeat( $indent, $indent_level ) . "\"{$processor->get_modifiable_text()}\"\n";
 					break;
@@ -191,6 +192,7 @@ public static function build_html5_treelike_string( $fragment_context, $html ) {
 					switch ( $processor->get_comment_type() ) {
 						case WP_HTML_Processor::COMMENT_AS_ABRUPTLY_CLOSED_COMMENT:
 						case WP_HTML_Processor::COMMENT_AS_HTML_COMMENT:
+						case WP_HTML_Processor::COMMENT_AS_INVALID_HTML:
 							$comment_text_content = $processor->get_modifiable_text();
 							break;