What tool to choose for automatic testing of the daemon?

Question

CMake

I have a legacy project, or it's not clear to me yet...
c++ cmake jenkins linux
unit tests live very poorly.
but there is a need for more. namely, it is necessary to be able to run the final application / daemon in different poses and test it in different cases.
for example, a case that begs for automation (one of hundreds)):
1. start the service
2. throw sigterm
3. the application ended correctly (yes, the infection is now crashing).
in fact, help me choose / find a development environment / launch and monitor the execution of such tests, otherwise it’s a disaster ((now I’m doing the binding of creating the necessary case in the script and running the script through ctest ... I’m sure and really hope, the mind of the world, came up with something better)