tes·ter 2 
(tĕstər, tēstər)
(tĕstər, tēstər)n.
A canopy, as over a bed or pulpit.
[Middle English, from Medieval Latin testrum, from Late Latin testa, skull, from Latin, shell.]
tester2state bedroom of Empress Maria Feodorovna (1847-1928) at the Pavlovsk Palace
St. Petersburg, Russia