Many online purchases of televisions come with "complimentary white-glove" delivery service, rolled into the cost of the set. It is in their interest to ensure that the television arrives unbroken and in working order. It is as much about making sure that they are not being scammed in some way as much as it is about you getting a quality product. They'll test it to verify that it works, though they usually won't hook it up to your systems.
It's just like ordering furniture or mattresses, but they won't even charge you extra for it.