phpunit compat 5.6 vs 7.x

tests/BaseObjectTest.php

@@ -7,12 +7,15 @@ namespace Friendica\Test;
 
 use Friendica\App;
 use Friendica\BaseObject;
-use PHPUnit_Framework_TestCase;
-
+// backward compatibility
+if (!class_exists('\PHPUnit\Framework\TestCase')) {
+    class_alias('\PHPUnit_Framework_TestCase', '\PHPUnit\Framework\TestCase');
+}
+use \PHPUnit_Framework_TestCase;
 /**
  * Tests for the BaseObject class.
  */
-class BaseObjectTest extends PHPUnit_Framework_TestCase
+class BaseObjectTest extends \PHPUnit\Framework\TestCase
 {
 
 	/**