Create test for Feeds module

This looks good to me...you will need a fixture (a data file of dummy data) that you import.
Place the fixture in the data folder and name it feedsData.txt (or whatever suffix you need).
For your tests, use ATK-PW-1180/ATK-CY-1180. You'll have the whole range up to 1189.

@aangel, do you recommend using a file for RSS import or a stable url (for example, https://www.drupal.org/rss.xml → )? Or can we do both, as we need to test both Upload file and Download from URL options?

I would do both with two different tests.