MDL-86432 phpunit: Ensure that data providers do not modify state

lib/tests/classes/phpunit/moodle_extension.php

@@ -0,0 +1,44 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace core\tests\phpunit;
+
+use PHPUnit\Runner\Extension\Extension;
+use PHPUnit\Runner\Extension\Facade;
+use PHPUnit\Runner\Extension\ParameterCollection;
+use PHPUnit\TextUI\Configuration\Configuration;
+
+/**
+ * Moodle PHPUnit Extension Registration.
+ *
+ * @package    core
+ * @copyright  Andrew Lyons <[email protected]>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+final class moodle_extension implements Extension {
+    #[\Override]
+    public function bootstrap(
+        Configuration $configuration,
+        Facade $facade,
+        ParameterCollection $parameters
+    ): void {
+        if ($configuration->noOutput()) {
+            return;
+        }
+
+        $facade->registerSubscriber(new data_provider_finished_subscriber());
+    }
+}