Resolved Data Provider method is not static

Author: lucaboesch

tests/custom_completion_test.php

@@ -51,7 +51,7 @@ class custom_completion_test extends \advanced_testcase {
      *
      * @return array[]
      */
-    public function get_state_provider(): array {
+    public static function get_state_provider(): array {
         return [
             'Undefined rule' => [
                 'somenonexistentrule', COMPLETION_DISABLED, false, null, coding_exception::class
@@ -178,7 +178,7 @@ public function test_is_defined() {
      *
      * @return array[]
      */
-    public function get_available_custom_rules_provider(): array {
+    public static function get_available_custom_rules_provider(): array {
         return [
             'Completion submit available' => [
                 COMPLETION_ENABLED, ['completionsubmit']