public void GivenTheUserHasMadeTheFollowingTweets(string userName, Table tweets)
{
_twitter
.Stub(
twitter =>
twitter.Search(Arg <string> .Matches(s => Regex.IsMatch(s, string.Format("\\b{0}\\b", userName)))))
.Return(tweets.Rows.Select(row =>
new Tweet
{
Text = row["Text"],
TweetedAt = DateTime.Parse(row["At"]),
User = userName
}));
}