test: add test for multiple nested groups

Author: mychidarko

tests/groups.test.php

@@ -121,5 +121,6 @@ class TGroup
     $rx2Routes = $rx2->routes();
 
     expect($rx2Routes)->toBeArray();
+    expect($rx2Routes[count($rx2Routes) - 2]['pattern'] ?? null)->toBe('/group/nested/route');
     expect($rx2Routes[count($rx2Routes) - 1]['pattern'] ?? null)->toBe('/group/nested2/route');
 });