Provide way to test without recommended modules

[preaction]

I've got a project that has a bunch of optional dependencies which ship in the recommended section and I need a way to test that the dist still installs without those optional dependencies. Could I add an environment variable to disable the recommended modules? Or is there another way I should go about it?

Being able to add RECOMMENDED=0 to the matrix would allow me to only test this on one version of Perl.

[kjetilk]

This would indeed be nice to have. Another useful feature would be to have different tests for various combinations of modules.