Add serialize + normalize tests

Author: sirreal

tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php

@@ -1,4 +1,6 @@
 <?php
+
+use function PHPUnit\Framework\assertNotEmpty;
 /**
  * Unit tests covering WP_HTML_Processor serialization functionality.
  *
@@ -325,18 +327,16 @@ public static function data_provider_serialize_doctype() {
 	/**
 	 * @ticket TBD
 	 *
-	 * @dataProvider data_provider_special_leading_newline_cases
+	 * @dataProvider data_provider_normalize_special_leading_newline_cases
 	 */
-	public function test_special_leading_newline_handling( string $input, string $expected ) {
+	public function test_normalize_special_leading_newline_handling( string $input, string $expected ) {
 		$normalized = WP_HTML_Processor::normalize( $input );
 		$this->assertEqualHTML( $expected, $normalized );
 		$normalized_twice = WP_HTML_Processor::normalize( $normalized );
 		$this->assertEqualHTML( $expected, $normalized_twice );
 	}
 
-	/**
-	 */
-	public static function data_provider_special_leading_newline_cases() {
+	public static function data_provider_normalize_special_leading_newline_cases() {
 		return array(
 			'Leading newline in PRE' => array(
 				"<pre>\nline 1\nline 2</pre>",
@@ -356,4 +356,29 @@ public static function data_provider_special_leading_newline_cases() {
 			),
 		);
 	}
+
+	/**
+	 * @ticket TBD
+	 */
+	public function test_serialize_special_pre_leading_newline_handling() {
+		$processor = WP_HTML_Processor::create_fragment( "<pre>\n\nx</pre>" );
+		$text_content = '';
+		while ( $processor->next_token() ) {
+			if ( '#text' === $processor->get_token_type() ) {
+				$text_content .= $processor->serialize_token();
+			}
+		}
+		$this->assertSame( "\n\nx", $text_content );
+	}
+
+	/**
+	 * @ticket TBD
+	 */
+	public function test_serialize_special_textarea_leading_newline_handling() {
+		$normalized = WP_HTML_Processor::normalize( "<textarea>\n\nx</textarea>" );
+		$processor = WP_HTML_Processor::create_fragment( $normalized );
+		$processor->next_token();
+		$text_content = $processor->get_modifiable_text();
+		$this->assertSame( "\nx", $text_content );
+	}
 }