def test_parents_to_students(self):
u1 = User(username='******', email='*****@*****.**')
u2 = User(username='******',email='*****@*****.**')
db.session.add(u1)
db.session.add(u2)
db.session.commit()
s1 = Student(name='Fin')
s2 = Student(name='Ray')
db.session.add(s1)
db.session.add(s2)
db.session.commit()
u1.add_student(s1)
u1.add_student(s2)
assert u1.has_student(s1)
assert u1.has_student(s2)
assert s1.has_parent(u1)
u2.add_student(s1)
assert s1.has_parent(u2)
