[KEMField] Test programs compile now without stopping the build process

[danielfrh]

Hi everyone!

Compilation errors occur with KEMField test programs. These errors can be solved through adding void statements incorporating if cnditions into existing switch statements.
Furthermore default values for TestDielectrics have been set.

In various test files counter variable i (will be used inside loop, compiler does not recognize):

error: variable 'i' set but not used [-Werror,-Wunused-but-set-variable]
  370 |         unsigned int i = 0;

=> solved by adding "(void) i"

In addition following compilation error occurs:

error: result of comparison of constant -1 with expression of type 'char' is always false [-Werror,-Wtautological-constant-out-of-range-compare]

In these cases the if statement has been incorporated to the switch condition:

        if (optId == -1)
            break;

as

            case (-1):
                break;

Thanks,
Daniel

[2xB]

Thank you very much for the Pull Request! I never looked into these applications - are they of any use? Should they be run as part of our test pipeline?

[2xB]

Looks great! Should we run these applications as part of our automatic test pipeline?
Also, if you know why they exist, should they get a small README and be linked in https://github.com/KATRIN-Experiment/Kassiopeia/blob/main/CONTRIBUTING.md?