testing

PhabricatorFactSpec.php
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			<?php

			abstract class PhabricatorFactSpec {

			const UNIT_COUNT = 'unit-count';
			const UNIT_EPOCH = 'unit-epoch';

			public static function newSpecsForFactTypes(
			array $engines,
			array $fact_types) {
			assert_instances_of($engines, 'PhabricatorFactEngine');

			$map = array();
			foreach ($engines as $engine) {
			$specs = $engine->getFactSpecs($fact_types);
			$specs = mpull($specs, null, 'getType');
			$map += $specs;
			}

			foreach ($fact_types as $type) {
			if (empty($map[$type])) {
			$map[$type] = new PhabricatorFactSimpleSpec($type);
			}
			}

			return $map;
			}

			abstract public function getType();

			public function getUnit() {
			return null;
			}

			public function getName() {
			$type = $this->getType();
			return "Fact ({$type})";
			}

			public function formatValueForDisplay(PhabricatorUser $user, $value) {
			$unit = $this->getUnit();
			switch ($unit) {
			case self::UNIT_COUNT:
			return number_format($value);
			case self::UNIT_EPOCH:
			return phabricator_datetime($value, $user);
			default:
			return $value;
			}
			}

			}