Problems with Unit Testing

i found an opportunity to test it in a subfolder

change:
framework/system/Test/FeatureTestTrait.php
Line 310
$uri    = new URI(rtrim($config->baseURL, '/') . '/' . trim($path, '/ '));
to
$uri    = new URI('/' . trim($path, '/ '));

now you it is posible to test in subfolders