Add bootstrap

phpunit.xml

@@ -3,6 +3,7 @@
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.5/phpunit.xsd"
          backupGlobals="true"
          backupStaticAttributes="false"
+         bootstrap="tests/bootstrap.php"
          colors="false"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"

tests/bootstrap.php

@@ -0,0 +1,8 @@
+<?php
+
+foreach ([__DIR__ . '/../../../autoload.php', __DIR__ . '/../vendor/autoload.php'] as $file) {
+    if (file_exists($file)) {
+        require $file;
+        break;
+    }
+}