Which preposition to use with tester

in Occurrences 3%

But if the house be swept, And from uncleanness kept, We praise the household maid, And duly she is paid; For we use, before we go, To drop a tester in her shoe.

of Occurrences 1%

At the foot of this column a paragraph records the death of a miserly bachelor schoolmaster, who had worn the same coat twenty years, and on the tester of whose bed were found, wrapped up in old stockings £1,600.

Which preposition to use with  tester