download a file from a link using DrupalWebTestCase? I'm building a module that has a file download as part of its functionality. The data in it is dynamically populated from the use of forms. 

Is there a method in DrupalWebTestCase that will allow me to download it? Or do I resort to wget?
The class DrupalWebTestCase has the method DrupalWebTestCase::curlExec(), which accepts an array containing the same values used by curl_setopt().