--- /dev/null
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ * Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Installers\Test;
+
+use Composer\Package\Version\VersionParser;
+use Composer\Package\Package;
+use Composer\Package\AliasPackage;
+use Composer\Package\LinkConstraint\VersionConstraint;
+use Composer\Util\Filesystem;
+
+abstract class TestCase extends \PHPUnit_Framework_TestCase
+{
+ private static $parser;
+
+ protected static function getVersionParser()
+ {
+ if (!self::$parser) {
+ self::$parser = new VersionParser();
+ }
+
+ return self::$parser;
+ }
+
+ protected function getVersionConstraint($operator, $version)
+ {
+ return new VersionConstraint(
+ $operator,
+ self::getVersionParser()->normalize($version)
+ );
+ }
+
+ protected function getPackage($name, $version)
+ {
+ $normVersion = self::getVersionParser()->normalize($version);
+
+ return new Package($name, $normVersion, $version);
+ }
+
+ protected function getAliasPackage($package, $version)
+ {
+ $normVersion = self::getVersionParser()->normalize($version);
+
+ return new AliasPackage($package, $normVersion, $version);
+ }
+
+ protected function ensureDirectoryExistsAndClear($directory)
+ {
+ $fs = new Filesystem();
+ if (is_dir($directory)) {
+ $fs->removeDirectory($directory);
+ }
+ mkdir($directory, 0777, true);
+ }
+}