Issue 3079209: Fix coding standard issues

tests/src/Functional/RequestTestJsonapi.php

@@ -22,6 +22,8 @@ final class RequestTestJsonapi extends RequestTestBase {
    * Restrict JSON:API to only read operations:
    *  - false - disabled;
    *  - true - enabled.
+   *
+   * @var bool
    */
   protected $readOnly = TRUE;
 
@@ -61,14 +63,14 @@ final class RequestTestJsonapi extends RequestTestBase {
   }
 
   /**
-   * Dataprovider for testRequests.
+   * Data provider for testRequests.
    */
-  public function providerRequestTypes() {
+  public static function providerRequestTypes(): iterable {
     $data = [];
     $parent_data = parent::providerRequestTypes();
     // Add read-only option.
     foreach ($parent_data as $key => $value) {
-      foreach ([false, true] as $read_only) {
+      foreach ([FALSE, TRUE] as $read_only) {
         $new_key = $key . ':' . ($read_only ? 'read_only_enabled' : 'read_only_disabled');
         $data[$new_key] = array_merge([$read_only], $value);
       }