Example UX cucumber feature file/scenario

Cucumber Example.feature

Feature: This is for the user notification indicator that is up in the top right of the main meny bar.

  Scenario: On the top right of the main menu the user should see a notification indicator
    Given that the user is logged in
    Then the notification box should be visible

  Scenario: If the user has no notifications, they will see the notificaton box as grayed out with a zero in it
    Given that the user is logged in
    And they have no new notifications
    And they have no inbox notifications
    Then they will see the disabled state with a zero indicator

  Scenario: If the user has no new notifications, the notification box will be grayed out with the number of inbox items in it
    Given that the user is logged in
    And they have no new notifications
    And they have inbox notifications
    Then they will see the disabled state with the number of inbox items

  Scenario: If the user has new messages, the notification box will be red and show the number of new notifications in the box
    etc....
    etc....

  Scenario: When the user clicks on the notification box, they will receive a dropdown menu showing "view new, mark all as read, go to inbox"
    etc....
    etc....

  Scenario: If the user has no new messages, the "view new" option will be visible but disabled
    etc....
    etc....
  Scenario: If a notification arrives while the user is logged in, the notification box will live update and bounce to indicate that there is a new message
    etc....
    etc....

  Scenario: If the user is not logged in, the notification box will not be shown at all
    etc....
    etc....

Just a quick, dirty, and questionably accurate cucumber .feature file. You should get the basic idea from it.