In the default situation this will set the error reporting to E_ALL |
E_STRICT and pull in Horde/Test/Autoload.php as autoloading
definition. If there is an Autoload.php in $_dir, then only this file
will be used.
In addition the setup() call will attempt to detect the "lib" directory
of the component currently under test and add it to the
include_path. This ensures that the component code from the checkout is
preferred over whatever else might be available in the default
include_path.