file3.actual.txt

  0:  OK

->list_users
  1:  OK
  There are no users registered in the system yet.

->list_groups
  2:  OK
  There are no groups registered in the system yet.

->add_user(2,"Ben")
  3:  OK
  Users:
      2->Ben
  Groups:
  Registrations:
  All messages:
  New messages:
  Old/read messages:

->add_user(1,"Ben")
  4:  OK
  Users:
      1->Ben
      2->Ben
  Groups:
  Registrations:
  All messages:
  New messages:
  Old/read messages:

->add_group(3,"Doctors")
  5:  OK
  Users:
      1->Ben
      2->Ben
  Groups:
      3->Doctors
  Registrations:
  All messages:
  New messages:
  Old/read messages:

->add_group(1,"Doctors")
  6:  OK
  Users:
      1->Ben
      2->Ben
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
  All messages:
  New messages:
  Old/read messages:

->register_user(1,3)
  7:  OK
  Users:
      1->Ben
      2->Ben
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{3->Doctors}
  All messages:
  New messages:
  Old/read messages:

->register_user(1,1)
  8:  OK
  Users:
      1->Ben
      2->Ben
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
  All messages:
  New messages:
  Old/read messages:

->add_user(2,"May")
  9:  ERROR 
  ID already in use.

->add_user(5,"May")
  10:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
  All messages:
  New messages:
  Old/read messages:

->add_user(6," Jane")
  11:  ERROR 
  User name must start with a letter.

->add_group(2," Food-lovers")
  12:  ERROR 
  Group name must start with a letter.

->list_groups
  13:  OK
  1->Doctors
  3->Doctors

->list_users
  14:  OK
  1->Ben
  2->Ben
  5->May

->register_user(2,1)
  15:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
  All messages:
  New messages:
  Old/read messages:

->register_user(1,5)
  16:  ERROR 
  Group with this ID does not exist.

->register_user(5,1)
  17:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
  New messages:
  Old/read messages:

->send_message(1,1,"Hey, this is Ben")
  18:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->Hey, this is Be ...
  New messages:
      [2, Ben]->{1}
      [5, May]->{1}
  Old/read messages:

->send_message(2,1,"Hello , Ben Fromm Here")
  19:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->Hey, this is Be ...
      2->Hello , Ben Fro ...
  New messages:
      [1, Ben]->{2}
      [2, Ben]->{1}
      [5, May]->{1, 2}
  Old/read messages:

->read_message(1,1)
  20:  ERROR 
  Message has already been read. See `list_old_messages'.

->read_message(2,1)
  21:  OK
  Message for user [2, Ben]: [1, "Hey, this is Ben"]
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->Hey, this is Be ...
      2->Hello , Ben Fro ...
  New messages:
      [1, Ben]->{2}
      [5, May]->{1, 2}
  Old/read messages:
      [2, Ben]->{1}

->send_message(5,1,"Hello , this is May")
  22:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->Hey, this is Be ...
      2->Hello , Ben Fro ...
      3->Hello , this is ...
  New messages:
      [1, Ben]->{2, 3}
      [2, Ben]->{3}
      [5, May]->{1, 2}
  Old/read messages:
      [2, Ben]->{1}

->read_message(2,2)
  23:  ERROR 
  Message has already been read. See `list_old_messages'.

->read_message(5,3)
  24:  ERROR 
  Message has already been read. See `list_old_messages'.

->delete_message(5,3)
  25:  ERROR 
  Message with this ID not found in old/read messages.

->delete_message(1,1)
  26:  ERROR 
  Message with this ID not found in old/read messages.

->list_old_messages(1)
  27:  OK
  There are no old messages for this user.

->list_old_messages(2)
  28:  OK
  Old/read messages for user [2, Ben]:
      1->Hey, this is Be ...

->list_old_messages(3)
  29:  ERROR 
  User with this ID does not exist.

->list_old_messages(5)
  30:  OK
  There are no old messages for this user.

->list_new_messages(1)
  31:  OK
  New/unread messages for user [1, Ben]:
      2->Hello , Ben Fro ...
      3->Hello , this is ...

->list_new_messages(2)
  32:  OK
  New/unread messages for user [2, Ben]:
      3->Hello , this is ...

->list_new_messages(3)
  33:  ERROR 
  User with this ID does not exist.

->list_new_messages(5)
  34:  OK
  New/unread messages for user [5, May]:
      1->Hey, this is Be ...
      2->Hello , Ben Fro ...

->set_message_preview(1)
  35:  OK
  Users:
      1->Ben
      2->Ben
      5->May
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->H ...
      2->H ...
      3->H ...
  New messages:
      [1, Ben]->{2, 3}
      [2, Ben]->{3}
      [5, May]->{1, 2}
  Old/read messages:
      [2, Ben]->{1}

->add_user(8,"Franck")
  36:  OK
  Users:
      1->Ben
      2->Ben
      5->May
      8->Franck
  Groups:
      1->Doctors
      3->Doctors
  Registrations:
      [1, Ben]->{1->Doctors, 3->Doctors}
      [2, Ben]->{1->Doctors}
      [5, May]->{1->Doctors}
  All messages:
      1->H ...
      2->H ...
      3->H ...
  New messages:
      [1, Ben]->{2, 3}
      [2, Ben]->{3}
      [5, May]->{1, 2}
  Old/read messages:
      [2, Ben]->{1}

->list_users
  37:  OK
  1->Ben
  2->Ben
  8->Franck
  5->May

->list_groups
  38:  OK
  1->Doctors
  3->Doctors