chore: add GUT test framework

addons/gut/test/unit/test_bugs/test_i436.gd

@@ -0,0 +1,30 @@
+extends GutTest
+# https://github.com/bitwes/Gut/issues/436
+
+# This script for this scene has an export variable that has been set in the
+# editor.  The position was also changed to (10, 10)
+var TestScene = load('res://test/resources/Issue436Scene.tscn')
+
+func test_illustrate_scene_instance_gets_value():
+	var scene = autofree(TestScene.instantiate())
+	assert_eq(scene.test_export_value, 2)
+
+
+func test_partial_double_gets_export_value_set_in_editor():
+	var scene = partial_double(TestScene).instantiate()
+	assert_eq(scene.test_export_value, 2)
+
+
+func test_partial_double_with_include_native_gets_export_value_set_in_editor():
+	var scene = partial_double(TestScene, DOUBLE_STRATEGY.INCLUDE_NATIVE).instantiate()
+	assert_eq(scene.test_export_value, 2)
+
+
+func test_double_gets_export_value_set_in_editor():
+	var scene = double(TestScene).instantiate()
+	assert_eq(scene.test_export_value, 2)
+
+
+func test_partial_double_gets_other_node_properties_that_were_set_in_editor():
+	var scene = partial_double(TestScene).instantiate()
+	assert_eq(scene.position, Vector2(10.0, 10.0))