If you buy a new car, you will not be entitled to register the vehicle in your name if you are not a new updated certificate and roadworthy. In South Africa you are not allowed to your own vehicle be renewed each year if you are not a new updated certificate and roadworthy.
To clarify the important issue of car insurance, you are not entitled to buy car insurance without a valid roadworthy. The car insurance will not check whether your vehicle is in running condition or not, but if you have an accident and it turns out that the car was not in perfect condition at the time of the accident is not the insurance company must pay. This is even more the fact that the car is wrong, what caused the accident in the first place! Regardless of whether they pass roadworthy as unwise, without an update of the certificate, you must remember it is illegal to drive without proof of travel on your vehicle.
In summary, it is very easy to see how it is absolutely necessary, have a certificate update works on your car. If you do not know where they go for a certificate of good conditions, have a look on the Internet. You should find the test site and a copy of the test sheet on the web. The test sheet can be of great benefit, because you can try to all problems could arise in your opinion, before you resolve to go check it.