chore: add GUT test framework

addons/gut/test/unit/test_gut_config_gui.gd

@@ -0,0 +1,29 @@
+extends GutTest
+
+var GutConfigGui = load('res://addons/gut/gui/gut_config_gui.gd')
+var GutConfig = load('res://addons/gut/gut_config.gd')
+
+func _get_default_options():
+	var ctrl = add_child_autofree(HBoxContainer.new())
+	var gc = GutConfig.new()
+	gc.options.double_strategy = GutUtils.get_enum_value(gc.options.double_strategy, GutUtils.DOUBLE_STRATEGY)
+	var gcc = GutConfigGui.new(ctrl)
+	gcc.set_options(gc.options)
+	var opts = gcc.get_options(gc.options)
+	return opts
+
+
+func test_can_make_one():
+	var ctrl = add_child_autofree(HBoxContainer.new())
+	assert_not_null(autofree(GutConfigGui.new(ctrl)))
+
+func test_free_makes_no_orphans():
+	var ctrl = add_child_autofree(HBoxContainer.new())
+	var gcc = GutConfigGui.new(ctrl)
+	gcc = null
+	await wait_physics_frames(1)
+	assert_no_new_orphans()
+
+func test_double_strategy_is_script_only():
+	var opts = _get_default_options()
+	assert_eq(opts.double_strategy, GutUtils.DOUBLE_STRATEGY.SCRIPT_ONLY)