remove pdo_sqlite dependency

tests/unit/_bootstrap.php

@@ -40,7 +40,7 @@ define("TEST_FIXTURES_PATH", dirname(__DIR__) . "/_data/");
 require __DIR__ . '/../../composer/autoload.php';
 
 global $STUDIP_BASE_PATH;
-$STUDIP_BASE_PATH = realpath(dirname(dirname(__FILE__)) . '/..');
+$STUDIP_BASE_PATH = realpath(dirname(__DIR__) . '/..');
 
 require 'lib/classes/StudipAutoloader.php';
 require 'lib/functions.php';

tests/unit/lib/classes/StudipPdoTest.php

 <?php
+
 /*
  * studip_pdo_test.php - unit tests for the StudipPDO class
  *
@@ -16,7 +17,16 @@ class StudipPdoTest extends \Codeception\Test\Unit
 {
     public function setUp(): void
     {
-        $this->testPdo = new class ('sqlite::memory:') extends StudipPDO {
+        $dsn =
+            'mysql:host=' .
+            $GLOBALS['DB_STUDIP_HOST'] .
+            ';dbname=' .
+            $GLOBALS['DB_STUDIP_DATABASE'] .
+            ';charset=utf8mb4';
+        $username = $GLOBALS['DB_STUDIP_USER'];
+        $password = $GLOBALS['DB_STUDIP_PASSWORD'];
+
+        $this->testPdo = new class ($dsn, $username, $password) extends StudipPDO {
             public static function doReplaceStrings($statement)
             {
                 return parent::replaceStrings($statement);