chore: add GUT test framework

addons/gut/test/unit/test_results_tree_control.gd

@@ -0,0 +1,66 @@
+extends GutTest
+
+var ResultTree = load('res://addons/gut/gui/ResultsTree.tscn')
+
+func make_json_top():
+	return {
+		"test_scripts": {
+		"props": {
+			"errors": 0,
+			"failures": 0,
+			"orphans": 0,
+			"passing": 0,
+			"pending": 0,
+			"tests": 0,
+			"time": 0,
+			"warnings": 0
+		},
+		"scripts": {}
+		}
+	}
+
+func add_script_to_json(script_name, add_to):
+	var script_json = {
+		"props": {
+			"failures": 0,
+			"pending": 0,
+			"tests": 0,
+			"skipped": false,
+		},
+		"tests": {}
+	}
+	add_to.test_scripts.scripts[script_name] = script_json
+	return script_json
+
+func add_test_to_json(test_name, add_to):
+	var test_json ={
+		"failing": [],
+		"orphan_count": 0,
+		"passing": [],
+		"pending": [],
+		"status": "pass"
+	}
+	add_to.tests["test_can_spy_on_built_ins_when_doing_a_full_double"] = test_json
+	return test_json
+
+
+func test_assert_can_create_one():
+	var rt = autofree(ResultTree.instantiate())
+	assert_not_null(rt);
+
+func test_has_show_orphans_property():
+	var rt = autofree(ResultTree.instantiate())
+	assert_property(rt, 'show_orphans', true, false)
+
+func test_has_hide_passing_property():
+	var rt = autofree(ResultTree.instantiate())
+	assert_property(rt, 'hide_passing', true, false)
+
+
+func test_load_a_single_script():
+	var rt = add_child_autofree(ResultTree.instantiate())
+	var j = make_json_top()
+	var s1 = add_script_to_json("res://some_script.gd", j)
+	var t1 = add_test_to_json("test_foo", s1)
+	rt.load_json_results(j)
+	pass_test('made it here')