public void AddingStudentToCourseShouldincreaseItsStudentsCount()
{
var student = new Student(34444, "aaa");
var school = new School("the school", new List<Course> { new Course("course", new List<Student>()) });
school.AddStudentToCourse(student, "course");
Assert.AreEqual(1, school.Courses.Single(x => x.Name == "course").Students.Count);
}
