chore: add GUT test framework

addons/gut/scratch/new_get_set.gd

@@ -0,0 +1,69 @@
+extends SceneTree
+
+class NewAccessors:
+    var foo = 1 :
+        get:
+            print('get foo')
+            return foo
+        set(val):
+            print('set foo ', foo, ' -> ', val)
+            foo = val
+
+    var _bar = 'a'
+    var bar = _bar :
+        get:
+            print('get bar')
+            return _bar
+        set(val):
+            print('set bar ', bar, ' -> ', val)
+            _bar = val
+
+    var one_line = 'cool' :
+        get: return one_line
+        set(val): one_line = val
+
+    var _other_methods = 'hello'
+    var other_methods = _other_methods :
+        get: return _get_other_methods()
+        set(val): _set_other_methods(val)
+
+    var read_only = 'read me' :
+        get: return read_only
+        set(val): print('READ ONLY, CANNOOT SET')
+
+
+
+    func _get_other_methods():
+        print('get_other_methods')
+        return _other_methods
+
+    func _set_other_methods(val):
+        print('set_other_methods ', _other_methods, ' -> ', val)
+        _other_methods = val
+
+
+    func set_foo_internally(val):
+        foo = val
+
+    func set_bar_internally(val):
+        _bar = val
+
+
+func _init():
+    var na = NewAccessors.new()
+    na.foo = 10
+    na.set_foo_internally(20)
+
+    na.bar = 'b'
+    na.set_bar_internally('c')
+
+    na.one_line = 'man'
+    print(na.one_line)
+
+    na.other_methods = 'world'
+    print(na.other_methods)
+
+    na.read_only = 'wroten'
+    print(na.read_only)
+    quit()
+