Scenario 2.1. Update Username

2.1.S1. User can update username successfully.

GIVEN user already logged in
AND user visit home
WHEN user click top right menu button

THEN user sees the popup menu
WHEN user click my account button

THEN user redirected to account page
WHEN user click username button

THEN user redirected to update username page

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WHEN user changes username input from "admin" to "johndoe"

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WHEN user click save button

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THEN user sees success notification "Update success"

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