static void Main()
        {
            // Student
            Mock<IStudent> studentMock = new Mock<IStudent>();
            studentMock.SetupAllProperties();

            IStudent student = studentMock.Object;
            student.Name = "Student Name";
            student.Age = 18;

            // Student Collection
            IList<IStudent> backingList = new List<IStudent>();

            Mock<IStudentCollection> studentCollectionMock = new Mock<IStudentCollection>();
            studentCollectionMock.SetupAllProperties();
            studentCollectionMock.Setup(sc => sc.GetEnumerator()).Returns(backingList.GetEnumerator());
            studentCollectionMock.Setup(sc => sc.Add(It.IsAny<IStudent>())).Callback<IStudent>((s) => backingList.Add(s));
            studentCollectionMock.Setup(sc => sc.Count).Returns(() => backingList.Count);
            studentCollectionMock.Setup(sc => sc[It.IsAny<int>()]).Returns<int>(i => backingList.ElementAt(i));
            studentCollectionMock.Setup(sc => sc.GetEnumerator()).Returns(() => backingList.GetEnumerator());

            IStudentCollection students = studentCollectionMock.Object;

            // School
            Mock<ISchool> schoolMock = new Mock<ISchool>();
            schoolMock.SetupAllProperties();

            ISchool school = schoolMock.Object;
            school.Name = "School Name";
            school.Students = students;
            school.Students.Add(student);
        }