public void ModifyFeed_WithValidFeed_ModifiesAndSavesChangesToFeed()
{
context.Feeds.Add(new Feed { Title = "test feed 1", Url = "url" });
context.SaveChanges();
DataRepository underTest = new DataRepository(context);
Feed feedToModify = context.Feeds.First();
feedToModify.Title += " MODIFIED";
underTest.ModifyFeed(feedToModify);
var feedTitleProperty = context.Entry(feedToModify).Property(f => f.Title);
Assert.AreEqual(feedTitleProperty.CurrentValue, feedTitleProperty.OriginalValue);
}