Initial tests

[kkotenko]

This adds some tests to the dependency functionality (mostly because I wanted to see how the dependency on suites behaves, exactly.)

Unfortunately, I was unable to figure out how to let multiple suites run programmatically, so I am delegating that to a CLI execution, which only gives me the return code (i.e. number of failed tests, effectively). I hope someone can find a better way.

I was also unable to verify the issued warnings, as I am not that deeply familiar with the internals of robot.

[mentalisttraceur]

Thank you for this! We definitely should add some tests, and this is a great start!

Sorry it's taken so long for me to get to this. I've now taken a closer look and first impressions are good.

Now I just gotta make some time to pull this down and play with it a bit - I'm not sure yet when that will happen, but I'll go ahead and merge it as soon as I've had a chance to do that, and then we can improve on it as time+motivation+priority permits.

[kkotenko]

No worries!