Comma separated part numbers for run-tests.py

[armanbm177]

Enabled multiple part nums to be run in sequence for run-tests.py. Inspired by the lab 4 part 3 exploit, that doesn't require a working part 2 to get a majority of part 3 points.

Example terminal commands:
./run-tests.py -l 4 -p 2,3

[emichael]

Thanks for looking into this!

The only problem I can see is that this is incompatible with the testNum option. Look at DSLabsTestCore:220. I think you need to only allow non-fully-qualified test numbers when there is exactly one part specified.

That is -l 1 -p 2 -n 4 should work, but -l 1 -p 2,3 -n 4 should not.

The other possibility is for the second command to work and choose test 4 in parts 2 and 3, but I don't think you'd ever want to do that.

[emichael]

str is the default type, no need to specify it

Also, please make a note in the help string about what kinds of inputs this can take now. Look at --test-num

[wilcoxjay]

you need to only allow non-fully-qualified test numbers when there is exactly one part specified.

That is -l 1 -p 2 -n 4 should work, but -l 1 -p 2,3 -n 4 should not.

This makes sense to me. Is it ok to only put this check in the python script, or do we enforce these things in both python and java?

[emichael]

Either/both is fine. There could be more input validation and better error messages for the student facing scripts in general :-)