testing

PhabricatorSelectSetting.php
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			<?php

			abstract class PhabricatorSelectSetting
			extends PhabricatorSetting {

			abstract protected function getSelectOptions();

			final protected function newCustomEditField($object) {
			$setting_key = $this->getSettingKey();
			$default_value = $object->getDefaultValue($setting_key);

			$options = $this->getSelectOptions();

			if (isset($options[$default_value])) {
			$default_label = pht('Default (%s)', $options[$default_value]);
			} else {
			$default_label = pht('Default (Unknown, "%s")', $default_value);
			}

			$options = array(
			'' => $default_label,
			) + $options;

			return $this->newEditField($object, new PhabricatorSelectEditField())
			->setOptions($options);
			}

			final public function validateTransactionValue($value) {
			if (!strlen($value)) {
			return;
			}

			$options = $this->getSelectOptions();

			if (!isset($options[$value])) {
			throw new Exception(
			pht(
			'Value "%s" is not valid for setting "%s": valid values are %s.',
			$value,
			$this->getSettingName(),
			implode(', ', array_keys($options))));
			}

			return;
			}

			public function getTransactionNewValue($value) {
			if (!strlen($value)) {
			return null;
			}

			return (string)$value;
			}

			}