how to test my stored procedures?

hi everybody.

i am writing stored procedures.
lots of them have out parameters.

i dont know how to test them
from an sql query tool(ex: pgAdmin query tool).
i am trying to test them from my program, but it is not so efficient.

i want to test from a query tool.
i can do with procedures without out paramters,
but how to achive with out parameters?
can i declare a variable out of procedure and
then send it as an out parameter and see it is value?

thanks for your help.