Resolve #3482425 "Improve test cover"

Added test for each menu item, checking the expected response when the item is clicked. Closes #3482425

src/Controller/NavigationExtraToolsController.php

@@ -177,20 +177,20 @@ final class NavigationExtraToolsController extends ControllerBase {
   }
 
   /**
-   * Run the cron.
+   * Rebuild the theme registry.
    */
-  public function runCron() {
-    $this->cron->run();
-    $this->messenger()->addMessage($this->t('Cron ran successfully.'));
+  public function themeRebuild() {
+    $this->themeRegistry->reset();
+    $this->messenger()->addMessage($this->t('Theme registry rebuilt.'));
     return new RedirectResponse($this->reloadPage());
   }
 
   /**
-   * Rebuild the theme registry.
+   * Run the cron.
    */
-  public function themeRebuild() {
-    $this->themeRegistry->reset();
-    $this->messenger()->addMessage($this->t('Theme registry rebuilt.'));
+  public function runCron() {
+    $this->cron->run();
+    $this->messenger()->addMessage($this->t('Cron ran successfully.'));
     return new RedirectResponse($this->reloadPage());
   }