Add a unit test suite for GDScript

[Calinou]

This tests run-time script loading and is a complement to the existing integration tests.

[akien-mga]

Shouldn't this go in modules/gdscript/tests/ together with other GDScript tests? And then might need a more explicit name as test_gdscript.h already exists.

[Xrayez]

Shouldn't this go in modules/gdscript/tests/ together with other GDScript tests? And then might need a more explicit name as test_gdscript.h already exists.

Yes, but I'm not sure if this will work, but should likely work... Yet maybe Calinou has other motivations for doing so. But yeah, I'd prefer to have all GDScript related tests to be under modules/gdscript/tests/.

[Calinou]

Shouldn't this go in modules/gdscript/tests/ together with other GDScript tests? And then might need a more explicit name as test_gdscript.h already exists.

Done. I ended up just moving the test case into the existing GDScript test suite. The current test suite file is pretty short, so that should be fine.

[akien-mga]

Thanks!

[vnen]

Hm, this is actually crashing for me because the language has not been initialized.

EDIT: It crashes when its running on its own. If running the other GDScript suite it doesn't crash since the other tests initializes the language.