I must say I disagree with that to some extent--most genetic tests won't tell you much about the future health of a doberman puppy--the exception being a genetic test for vonWillebrand's. Almost all of the genes commonly looked for in the genetic panels that are out there are for conditions that are not present in dobermans.
You may have heard of DCM1 and DCM2 genetic tests, but they do not predict heart disease well (DCM appears to have many genes involved--a positive DCM1 or 2 dog may not develop DCM; a negative dog still can) and are basically just for research purposes at this point.
There are a few other tests that can be done if you are thinking of breeding your dog (so you can make sure not to breed two carriers together), but which won't tell you much about a particular puppy's health. A breeder may run tests for DINGS in his breeding pair to check for carrier status, for example, and to avoid the possibility of DINGS puppies in their planned litter. But when a puppy is actually born with it you will know. Those puppies are generally deaf and have various neurological problems. If your puppy seems to be normal in that respect, you are not likely to have a problem.
Degenerative Myelopathy is another--you would not want to breed two carriers together. But unless you see symptoms in your dog, there isn't much you can do to treat him differently. So knowing the genetic status of your ordinary pet dog who has no symptoms isn't particularly useful.
You should get genetic vWD test done. (see links below) If that is the only genetic testing you do on your dog, it will be quite a bit cheaper than an entire panel, more like $65 to $95.
VetGen: Veterinary Genetic Services - Canine - List of Services - Doberman Pinscher Dilated Cardiomyopathy (DCM)-DOB Panel Testing
www.vetnostic.com/doberman-pinscher.html
Apart from genetic tests, though, a breeder should have tested his dogs for hip and elbow dysplasia (one time X-rays), yearly liver and thyroid function (blood tests) and yearly tests for heart disease (a 24 hour holter and echocardiogram) BEFORE breeding his dogs (ideally in the previous 6 months.) It is not likely your breeder has done that. But there are no effective and reliable genetic tests for any of those
You should do yearly checkups for these problems once your pup is mature (you can wait 2-3 years before starting the yearly tests for thyroid and heart disease; the pup also needs to be at least 2 before the hip and elbow dysplasia tests).