As a hobby soapmaker I can tell you that testing fragrance in soap (cold process, hot process, melt and pour) particularly will be a long hard road. Many essential oils accelerate the trace of soap ruining batches, many fragrance oils the same. There's the issue of discolouration of the soap bar (vanillin is a villain for this turning everything brown) and longevity as well as stability in the highly caustic environment of saponification. There's a lot of complications and a lot of big professional companies in that arena too. You'll have to not only test the fragrance in a live batch but also cure it for a year to ensure the fragrance properly sticks in soap. I wish you the best of luck but just in that one field alone, it will be a long, long road.