public void CalculateHighestGradeCorrectly()
{
GradeBook book = new GradeBook();
book.AddGrade(90f);
book.AddGrade(50f);
GradeStatistics stats = book.ComputeStatistics();
Assert.AreEqual(90f, stats.HighestGrade);
}
private static void AddingGrades(GradeBook book)
{
book.AddGrade(91);
book.AddGrade(89.5f);
book.AddGrade(75);
}