User is at the front page

1. User want to register a new user account.
2. The system renders a registration form.
3. The user fill in the form.
4. The system creates the user

• 4a. User already exist
  • i. System presents error message.
  • ii. Step 2 in main scenario.
• 4b. User enters illegal credentials
  • i. System presents error message.
  • ii. Step 2 in main scenario.

UC 1 is successful.

1. User enters credentials
2. System login user

• 2a. Credentials are incorrect
  • i. System presents error message.
  • ii. Step 1 in main scenario.

UC 2 is successful.

1. The user enters a new todo
2. The system adds the new todo to the database
3. The system renders a new view with the new todo's from the database

• 2a. The todo is not valid.
  • i. System shows an error message.
  • ii. Step 1 in main scenario.

UC 3 is successful.

1. User wants to edit a todo
2. System rerender the view and now let's the user edit the todo
3. User edits todo and saves it
4. The system updates the todo in the database

• 4a. Todo is not valid
  • i. System shows an error message.
  • ii. Step 2 in main scenario.

UC 3 is successful.

1. User marks a todo as done
2. System rerender the view and now strike out the todo

UC 5 is successful.

1. User want to unmark a todo as done
2. System rerender the view and now don't strike out the todo

UC 3 is successful.

1. User want to remove a todo
2. System ask the user to confirm
3. User confirm
4. System removes the todo

• 3a. User don't confirm
  • i. Rerender todo-list.

UC2 is successful.

1. User want to log out
2. System logout user