How to enable testing builds for a port with optional tests

[Aisha Tammy]

Hi all,

I was wondering how I can enable tests for a port which has tests 
available but needs an extra flag to enable tests.

It is a meson port and needs CONFIGURE_ARGS += -Denable_testing=true to 
enable tests, as this also checks for programs needed to run the tests.

This would mean that make configure needs to know if make test is going 
to be run later on. Is there anyway of doing a test build?

Like with this meson port, if configure is not done with 
enable_testing=true, it just does not run any tests, which doesn't seem 
correct.

Thanks,
Aisha