--- /dev/null
+<?php
+
+namespace Drupal\devel_test\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+
+/**
+ * Returns responses for devel module routes.
+ */
+class DevelTestController extends ControllerBase {
+
+ /**
+ * Returns a simple page output.
+ *
+ * @return array
+ * A render array.
+ */
+ public function simplePage() {
+ return [
+ '#markup' => $this->t('Simple page'),
+ ];
+ }
+
+}