ci: Allow for single exercise test exection

[tomasnorre]

I often want to execute only one of the tests in the exercises when adjusting tests, to speed up the process.

This PR will allow me to e.g. run only the tests for exercise book-store by adding an additional parameter.

It can be done in more way.

composer test:run -- book-store

PHPUNIT_BIN='phpunit' bin/test.sh book-store 

I hope this will get accepted as it gives me a better workflow when updating the PHP track.

[mk-mxp]

I like the workflow improvement! That's very welcome.

I haven't tested the suggested change, so take care. Using the -name filter allows wildcards like b*, too. Please test that this works also.

[tomasnorre]

Thanks for your feedback, will have a look at in the following days.

[tomasnorre]

Using the -name filter allows wildcards like b*, too. Please test that this works also.

This works if b* is wrapped in quotes.

$ composer test:run -- "b*" 

[tomasnorre]

I'll have to check why it's failing, will look into it.

[mk-mxp]

It fails, because the shell has set -u (fail on use of unbound variables). Therefore [ $# -ge 1 ] && [ -n "$1" ] is required, as you had it.

[mk-mxp]

Thanks for improving the contribution workflow! I also missed such functionality when checking changes.