chore: add GUT test framework

addons/gut/scratch/where_are_the_functions.gd

@@ -0,0 +1,34 @@
+extends SceneTree
+
+var ExtendsWinDialog = load('res://test/resources/doubler_test_objects/double_extends_window_dialog.gd')
+
+class TryThis:
+    extends 'res://test/resources/doubler_test_objects/double_extends_window_dialog.gd'
+
+    func emit_changed():
+        print('emit_changed')
+        # super.emit_changed()
+        print('emit_changed 2')
+
+func _init():
+    var foo = TryThis.new()
+    foo.emit_changed()
+    foo.free()
+
+    print(ExtendsWinDialog.get_base_script())
+    print(ExtendsWinDialog.get_instance_base_type())
+
+    var base_source = str("extends ", ExtendsWinDialog.get_instance_base_type())
+    var script = GDScript.new()
+    script.source_code = base_source
+    # this is causing an error in 4.0 (does not halt execution, just prints it)
+    # ERROR: Attempt to open script '' resulted in error 'File not found'.
+    # Everyting seems to work.  I suspect that the path is empty and it
+    # is throwing an erro that should not be thrown.  An issue has been
+    # created and marked as bug.
+    var result = script.reload()
+    var inst = script.new()
+
+    print(inst.get_method_list())
+    inst.free()
+    quit()