A process can be very large or it can be rather small depending on your needs.
Things that you might include in your test process (as subprocesses) can be:
1. Test planning stage (with a software test plan as output)
2. Test preparations (with test specifications as output)
3. Software integration (with an executable system as output)
4. Test execution (with result records as output)

You should also consider handling of error reports, CM-issues, test tools, inputs that are needed from other processes (such as requirements, design specs etc.).

Try to write your processes (subprocesses) with the following parts:
1. Introduction
2. Start conditions
3. Input data
4. Activities
5. Output data
6. Exit conditions
7. Roles/distribution of responsibility