public void OrderByAvgScoresDescendingTest()
{
var exams =
new[]
{
new Exam("anna", 9.5m), new Exam("anna", 7.0m), new Exam("anna", 8.0m),
new Exam("marcel", 7.0m), new Exam("marcel", 5.0m), new Exam("marcel", 8.0m),
new Exam("lluis", 9.0m), new Exam("lluis", 9.0m), new Exam("lluis", 9.0m),
new Exam("ari", 3.0m), new Exam("ari", 4.0m), new Exam("ari", 5.0m),
};
var qs = new Quizzes();
CollectionAssert.AreEqual(new[] {"lluis", "anna", "marcel", "ari"}
, qs.OrderByAvgScoresDescending(exams));
}