public void AverageDistance() { Assert.AreEqual(0, instance.AverageDistance); instance.Add(new MessageItem(new UserItem(new TweetUser()), new TweetData { Tick = 1, Latitude = 48.237867, Longitude = 16.389477 })); Assert.AreEqual(0, instance.AverageDistance); instance.Add( new MessageItem( new UserItem(new TweetUser()), new TweetData() { Tick = 2, Latitude = 48.672309, Longitude = 15.695585 })); Assert.AreEqual(35215.795759484099d, instance.AverageDistance); }