I have a few bantam cochins I keep for broodies. I love letting momma do the work, and watching a hen raise chicks is just the coolest thing! Course, you have to wait for them to go broody, it's not just on demand like an incubator. My bantam can take 8 large fowl eggs, incubators can take a lot...
Oh, if it's just for an incubation test, don't go through the expense of ordering eggs. Folks here put ads on craigslist all the time for fertile eggs for incubator testing or giving to a broody. Unless you want a specific breed, just post in the farm & garden section. Folks love to give or sell...