Fix E_DEPRECATED warnings caused by PHPUnit

Author: nibra

Tests/bootstrap.php

@@ -0,0 +1,6 @@
+<?php
+require_once 'vendor/autoload.php';
+
+// Turn off E_DEPRECATED caused by outdated PHPUnit
+$errorReporting = error_reporting();
+error_reporting($errorReporting & ~E_DEPRECATED);