test: Add test for MOVE_SLIDE_UP on slides reducer
test: Add test for MOVE_SLIDE_UP on slides reducer

Team-CHAD/DevDecks,DevDecks/devdecks,chengsieuly/devdecks,chengsieuly/devdecks,Team-CHAD/DevDecks,chengsieuly/devdecks,DevDecks/devdecks,Team-CHAD/DevDecks,DevDecks/devdecks