[asdf-devel] New test and windows

I pushed a new test for asdf:run-shell-command that I believe will not work on Windows. The first step should be to use reader switches to remove the test contents when running on Windows, but ideally we should supply some windows code to take the place of the posix code where appropriate.

The current test relies on /usr/bin/true and /usr/bin/false to test how asdf:run-shell-command checks exit codes.

To be honest, I don't even know if Windows commands /have/ exit codes!

See

tests/run-shell-command-test.script

I suspect that this means no one is running these tests, since there hasn't been a loud cry of outrage!