o1.addAdmin(u3, u1, false);
assertEquals(2, o1.getAllAdmins().size());
o1.addAdmin(u4, u1, false);
assertEquals(3, o1.getAllAdmins().size());
o1.removeAdmin(u3, u1);
assertEquals(2, o1.getAllAdmins().size());
o1.addAdmin(u3, u1, false);
assertEquals(2, o1.getAllAdmins().size());
o1.addAdmin(u4, u1, false);
assertEquals(3, o1.getAllAdmins().size());
o1.removeAdmin(u3, u1);
assertEquals(2, o1.getAllAdmins().size());