Add unit tests for each node

[Earewien]

Even if there is few code in this add-on, things can be quickly complicated when composing multiple behavior tree nodes.

It is necessary to add unit tests to improve stability

• Deploy GdUnit 4 works on Godot 4 beta 10 in behavior tree project
• Code some tests !

[Earewien]

I see two major unit test framework for Godot :

• GUT
• GDUnit 4

Both are awesome, but at the moment there are very instable for Godot 4 (beta).

I start to create my own add-on to do unit testing in Godot, with KISS in mind ! Just an easy way to run testsuites/testcases, to exploit the report. And some useful stuf to test nodes/scripts, like assertions, typed assertions, frame simulator, ...

Ok I'm a little crazy, but, yeah, l love that