update tests to work with phpunit version installed by composer

phpunit.xml

@@ -16,6 +16,7 @@
         <whitelist>
             <directory>./include/</directory>
             <directory>./public/</directory>
+						<directory>./src/</directory>
 				</whitelist>
     </filter>
     <php>

test/model/LogEntriesModelTest.php

@@ -1,9 +1,11 @@
 <?php
-
 namespace Engelsystem\Test;
 
-class LogEntriesModelTest extends \PHPUnit_Framework_TestCase
+use \PHPUnit\Framework\TestCase;
+
+class LogEntriesModelTest extends TestCase
 {
+
     public function create_LogEntry()
     {
         LogEntry_create('test', 'test');

test/model/RoomModelTest.php

@@ -1,9 +1,11 @@
 <?php
-
 namespace Engelsystem\Test;
 
-class RoomModelTest extends \PHPUnit_Framework_TestCase
+use \PHPUnit\Framework\TestCase;
+
+class RoomModelTest extends TestCase
 {
+
     private $room_id = null;
 
     public function create_Room()