public void GetAll_CorrectLink_TweetsStringListFormat() { //Arrange string username = "******"; TweetController tweetController = new TweetController(); Regex rx = new Regex(@"^\[.*\]$", RegexOptions.Compiled | RegexOptions.IgnoreCase); //Act var result = tweetController.GetAll(username).Result; MatchCollection matches = rx.Matches(result); //Assert Assert.IsInstanceOfType(result, typeof(string)); Assert.IsTrue(matches.Count != 0); }