Tests: Add types and docblocks to wpTexturize and wpHtmlSplit tests

tests/phpunit/data/formatting/whole-posts.php

@@ -1,6 +1,9 @@
 <?php
 
-function data_whole_posts() {
+/**
+ * @return non-empty-list<array{ non-falsy-string }>
+ */
+function data_whole_posts(): array {
 	return array(
 
 /* DIVIDER */

tests/phpunit/tests/formatting/wpHtmlSplit.php

@@ -11,12 +11,20 @@ class Tests_Formatting_wpHtmlSplit extends WP_UnitTestCase {
 	 * Basic functionality goes here.
 	 *
 	 * @dataProvider data_basic_features
+	 *
+	 * @param non-falsy-string       $input
+	 * @param list<non-falsy-string> $output
 	 */
-	public function test_basic_features( $input, $output ) {
-		return $this->assertSame( $output, wp_html_split( $input ) );
+	public function test_basic_features( string $input, array $output ): void {
+		$this->assertSame( $output, wp_html_split( $input ) );
 	}
 
-	public static function data_basic_features() {
+	/**
+	 * Data provider for {@see self::test_basic_features()}.
+	 *
+	 * @return list<array{ 0: non-falsy-string, 1: list<non-falsy-string> }>
+	 */
+	public static function data_basic_features(): array {
 		return array(
 			array(
 				'abcd efgh',
@@ -43,14 +51,21 @@ public static function data_basic_features() {
 	 * @dataProvider data_whole_posts
 	 *
 	 * @covers ::get_html_split_regex
+	 *
+	 * @param non-falsy-string $input
 	 */
-	public function test_pcre_performance( $input ) {
+	public function test_pcre_performance( string $input ): void {
 		$regex  = get_html_split_regex();
 		$result = benchmark_pcre_backtracking( $regex, $input, 'split' );
-		return $this->assertLessThan( 200, $result );
+		$this->assertLessThan( 200, $result );
 	}
 
-	public static function data_whole_posts() {
+	/**
+	 * Data provider for {@see self::test_pcre_performance()}.
+	 *
+	 * @return non-empty-list<array{ non-falsy-string }>
+	 */
+	public static function data_whole_posts(): array {
 		require_once DIR_TESTDATA . '/formatting/whole-posts.php';
 		return data_whole_posts();
 	}