Improve types in tests

Co-authored-by: Weston Ruter <[email protected]>

Author: sirreal

tests/phpunit/tests/html-api/wpHtmlProcessorModifiableText.php

@@ -82,8 +82,9 @@ public function test_set_modifiable_fails_non_atomic_tags(
 		string $html,
 		string $expected_namespace,
 		string $expected_tag
-	) {
+	): void {
 		$processor = WP_HTML_Processor::create_fragment( $html );
+		$this->assertInstanceOf( WP_HTML_Tag_Processor::class, $processor );
 		while ( $processor->next_tag() && $expected_tag !== $processor->get_tag() ) {
 			continue;
 		}
@@ -102,6 +103,8 @@ public function test_set_modifiable_fails_non_atomic_tags(
 
 	/**
 	 * Data provider.
+	 * 
+	 * @return array<string, array{0: string, 1: string, 2: string}>
 	 */
 	public static function data_set_modifiable_fails_non_atomic_tags(): array {
 		return array(

tests/phpunit/tests/html-api/wpHtmlTagProcessorModifiableText.php

@@ -678,7 +678,7 @@ public function test_set_modifiable_fails_non_atomic_tags(
 		string $html,
 		string $parsing_namespace,
 		string $expected_tag
-	) {
+	): void {
 		$processor = new WP_HTML_Tag_Processor( $html );
 		$processor->change_parsing_namespace( $parsing_namespace );
 		$processor->next_token();
@@ -697,9 +697,9 @@ public function test_set_modifiable_fails_non_atomic_tags(
 	/**
 	 * Data provider.
 	 *
-	 * @return array[]
+	 * @return array<string, array{0: string, 1: string, 2: string}>
 	 */
-	public static function data_set_modifiable_fails_non_atomic_tags() {
+	public static function data_set_modifiable_fails_non_atomic_tags(): array {
 		return array(
 			// Plain HTML tags.
 			'html DIV'                   => array( '<div>', 'html', 'DIV' ),