Hi, what tests are you having? I hope you get the best possible results 
I've had quite a few over the last couple of years. I don't really feel any anxiety about them. It's not a conscious thing though, so I'm not sure how to do it. My general attitude to life is along the lines of whatever will be, will be, so I suspect it's just the way I am, rather than any useful skill I could pass on!
Since my illness I've met lots of people in a similar position. I think most suffer at least some anxiety before results, some more extreme than others. I tend to feel like a complete weirdo, even my medical team think so, so I'm sure that anxiety is normal. I suppose people don't talk about it in real life as they don't want to worry those around them? Or perhaps because discussing their fears makes them feel more real? It probably makes it feel much more lonely for you though if you think no one else feels the same way!
Depending on how long term this situation is, and how anxious you are, you might find that you need to speak to someone about the anxiety. If the tests relate to a specific condition then there may be a relevant charity with a helpline you can contact to discuss your fears. Or you could speak to your GP or medical team.
If it's likely to be a longer term situation, you could consider some techniques to combat your anxiety. Something like mindfulness meditation could help, I find it very relaxing, and know others who have used it for anxiety or depression. Or you might be able to have CBT.
I've ramble on long enough so I will stop there. All the best