I would recommend testing that users can add to the feedpage.

```
visit '/feedpage'
fill_in :latest_news, with: "OMG IPHONE5S!"
click_on :add_news_button
expect(page).to have_content ("OMG IPHONE 5S")
```

This tests the full swathe of the feature.

Then you can write unit tests for the creation of a post on a user, etc.