start using PHPUnit and test all this

src/bootstrap.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 magdev
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author    magdev
+ * @copyright 2019 Marco Grätsch
+ * @package   magdev/dossier
+ * @license   http://opensource.org/licenses/MIT MIT License
+ */
+ 
+declare(strict_types=1);
+
+define('DOSSIER_ROOT', dirname(__DIR__));
+define('DOSSIER_CACHE', getenv('HOME').'/.dossier/cache');
+define('PROJECT_ROOT', getcwd());
+
+if (!is_dir(DOSSIER_CACHE)) {
+    mkdir(DOSSIER_CACHE, 0700, true);
+}
+
+require DOSSIER_ROOT.'/vendor/autoload.php';