RFE: issue diagnostic if Test::Alien::alien_ok hasn't been called

[djerius]

I forgot to include a call to alien_ok at the start of my test file, and was stumped by the fact that no compiler flags were passed to the compiler.

Through trial and error (after reading the docs multiple times and not noticing that alien_ok was at the start of very example), I figured it out.

However, if it's forgotten, it's not obvious what's going wrong.

After looking at the Test::Alien code, I think that an empty @aliens array is an error. If that's the case, perhaps checking if it's empty before using it and emitting an error saying "yo! call alien_ok" might be appropriate.

[plicease]

I don't think it should fail (it could be useful to test alien-less XS), but a diag to let the user know that they haven't specified any aliens yet.

[djerius]

That would work. Perhaps have it display a GIF of Homer Simpson slapping his forehead?

[plicease]

I think #263 should do the trick. It adds the diagnostic to all of the testing tools, which seems sensible.

[djerius]

Thanks!