Remove superfluous require 'rss'
Refactor: extract test helper method assert_channel_equal
Refactor: extract test helper method assert_item_equal
Refactor: extract test helper method assert_items_equal
Fix: sort lists of RSS items before comparing them
Refactor: introduce explaining variables
Refactor: move test support functions out of test class
Refactor: extract helper test method assert_channel_equal
Refactor: extract test helper method assert_items_equal
Add TODO
Add TODO
Refactor: extract test helper method assert_item_equal
Fix: sort lists of RSS and KSON items comparing them
Adjust code indentation