Test the arguments of all our command line tools

[cmnrd]

The bug fixed in #1631 showed that our current CLI tests are merely smoke tests and not sufficient to detect if arguments are passed properly and have the intended effect. We should add thorough tests for all command line arguments.

[patilatharva]

Would it be possible to run a select few unit tests from org.lflang.tests using the existing CliToolTestFixture? Or do you think we should just write new tests specifically for the CLI?

[cmnrd]

I think so, yes. When writing the issue, I forgot that @oowekyala already made a start at this. I think it only makes sense to build on this and add tests for all the command line arguments. Most important is, that the tests indeed verify the outcome of the argument. Are interested in taking a shot at this @patilatharva?

[patilatharva]

Yes, I'll give it a try using the existing CliToolTestFixture!