Tumors should be tested to learn about your particular mutation(s) and to help guide treatment and also determine if you are eligible for any trials. You should also be given that information and afforded plenty of opportunities to ask questions and gain a better understanding of what it all means. That is standard practice. PanCAN.org has a lot of information on the importance of tumor testing and if you look around the website you may find a lot of very helpful information and good advice.

Learning that you have cancer can be so overwhelming at first. So, ask lots of questions and learn as much as possible. It takes time, but it's important. Every single cancer is unique in some way to the individual and the testing they do on "your" tumor is essential. Hugs!