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By clearing `sessionStorage` and unsubscribing from `Location` events, after each test, we reduce the possibility of potential [spooky action at a distance][1]-type of failures in the future. This does not have an impact on the actual app, since `ScrollService` is currently expected to live throughout the lifetime of the app. Still, unsubscribing from `Location` events keeps the code consistent with how other `ScrollService` listeners are handled (e.g. for `window` events). [1]: https://en.wikipedia.org/wiki/Action_at_a_distance_(computer_programming) PR Close #33937