Just to confuse the issue, I have always understood the term
hobby breeder to mean someone who commits time and money to their dogs, learning as much as they can about them and becoming experienced "as a hobby", rather than someone who breeds their dog "for the children" or "just the odd litter" (often known as Backyard Breeders) or someone who breeds to make money (commercial breeders).
In my experience, hobby breeders are the ones
most likely to carry out tests etc, because they are knowledgeable and committed to their dogs - they learn about the genetics of their bitches and seek a suitable, compatible sire, with the aim of improving the quality of the dogs for whatever discipline (show, work, agility) that they participate in with their dogs.
Hobby breeders may have their dogs in kennels rather than a home environment; often if a "hobby" has taken over the home, it expands into a garden building of some form and dogs are no exception
No matter which type of breeder you find, there are definitely key points that you need to look for (in the link'y that Jeanette has posted); and DNA testing is one of them