student = Student.findById(2);
courses = student.getAll(Course.class);
a(1).shouldBeEqual(courses.size());
Course c = Course.findById(1);
List<Student> Students = c.getAll(Student.class);
a(2).shouldBeEqual(Students.size());
c = Course.findById(2);
Students = c.getAll(Student.class);
a(1).shouldBeEqual(Students.size());
}