Add missing class

tests/Composer/Test/Mock/VersionGuesserMock.php

@@ -0,0 +1,33 @@
+<?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\Test\Mock;
+
+use Composer\Package\Version\VersionGuesser;
+
+class VersionGuesserMock extends VersionGuesser
+{
+    public function __construct()
+    {
+    }
+
+    public function guessVersion(array $packageConfig, $path)
+    {
+        return null;
+    }
+
+    public function getDefaultBranchName($path)
+    {
+        return null;
+    }
+
+}