chore: add GUT test framework

addons/gut/test/unit/test_config_validator.gd

@@ -0,0 +1,53 @@
+extends GutTest
+
+var VersionConversion = load("res://addons/gut/version_conversion.gd")
+var from_file = 'user://test_version_conversion_move_this.cfg'
+var to_file = 'user://test_version_conversion_to_here.cfg'
+
+
+func before_all():
+	gut.file_delete(from_file)
+	gut.file_delete(to_file)
+	register_inner_classes(VersionConversion)
+
+func after_each():
+	gut.file_delete(from_file)
+	gut.file_delete(to_file)
+
+func test_moved_file_moves_file_to_new_location():
+	var updater = VersionConversion.ConfigurationUpdater.new()
+	gut.file_touch(from_file)
+	updater.moved_file(from_file, to_file)
+	assert_file_exists(to_file)
+
+func test_moved_file_does_not_remove_original():
+	var updater = VersionConversion.ConfigurationUpdater.new()
+	gut.file_touch(from_file)
+	updater.moved_file(from_file, to_file)
+	assert_file_exists(from_file)
+
+func test_moved_file_issues_warning_when_both_files_exist():
+	var updater = partial_double(VersionConversion.ConfigurationUpdater).new()
+	gut.file_touch(from_file)
+	gut.file_touch(to_file)
+	updater.moved_file(from_file, to_file)
+	var params = get_call_parameters(updater, 'warn')
+	assert_string_contains(params[0], 'You can delete')
+
+func test_move_user_file_moves_the_file():
+	var updater = VersionConversion.ConfigurationUpdater.new()
+	gut.file_touch(from_file)
+	updater.move_user_file(from_file, to_file)
+	assert_file_exists(to_file)
+
+func test_move_user_file_deletes_from_file():
+	var updater = VersionConversion.ConfigurationUpdater.new()
+	gut.file_touch(from_file)
+	updater.move_user_file(from_file, to_file)
+	assert_file_does_not_exist(from_file)
+
+func test_remove_user_file_deletes_the_file():
+	var updater = VersionConversion.ConfigurationUpdater.new()
+	gut.file_touch(from_file)
+	updater.remove_user_file(from_file)
+	assert_file_does_not_exist(from_file)