chore: add GUT test framework

addons/gut/test/integration/test_version_configuration.gd

@@ -0,0 +1,31 @@
+extends GutTest
+var UpdateDetector = GutUtils.UpdateDetector
+
+var data = GutUtils.get_file_as_text('res://addons/gut/versions.json')
+var ud = null
+
+func before_all():
+	ud = UpdateDetector.new()
+	add_child(ud)
+
+
+func after_all():
+	ud.free()
+
+
+func test_local_versions_file_is_valid():
+	ud.parse_file(ud.LOCAL_FILE_PATH)
+	assert_eq(ud.data_issues.size(), 0, "no data issues")
+	if(is_failing()):
+		gut.p(str("Issues:\n", ud.data_issues))
+	assert_has(ud.parsed_data.releases, GutUtils.version_numbers.gut_version,
+		"current version exists")
+
+
+func test_parsing_remote_data():
+	var error = ud.fetch_remote_file()
+	if(error == OK):
+		await wait_for_signal(ud.download_completed, 5)
+		assert_has(ud.parsed_data, 'releases')
+	else:
+		fail_test("There was an error starting request")