Widget test support

[rizumita]

Can I use glados with Widget Test?
If not, do you plan to support it?

[MarcelGarus]

It's not currently supported, I'd have to create a separate package and because I currently don't actively use Glados myself, I probably won't get to that in the near future.

I thought a bit on how to implement this. It would probably involve parameterizing the Glados.test function over the testing function (like, have an optional testingFunction parameter that defaults to test_package.test), and then creating a new glados_flutter package with Glados.widgetTest extensions which call the test function with the corresponding widget test method.

If you're interested in implementing that, I could add you as a contributor.