public void BuildTwitterFeed_SingleTweet_Should_Return_UsersWithTweets() { var users = _BuildUsersForSingleTweet(); var tweetMessage = "ETH is the future"; //build twitter feed _sut.BuildTwitterFeed(_tweetFileSingleLine, users); //assert that tweet was added to both users foreach (var userKey in users.Keys) { users[userKey].Tweets.Should().NotBeEmpty(); users[userKey].Tweets.First().Message.Should().BeEquivalentTo(tweetMessage, "because this was what the user tweeted"); } }