Use PHPUnit\Framework\TestCase instead of PHPUnit_Framework_TestCase

test/CommonMarkTest.php

@@ -8,7 +8,10 @@
  * @link http://commonmark.org/ CommonMark
  * @link http://git.io/8WtRvQ JavaScript test runner
  */
-class CommonMarkTest extends PHPUnit_Framework_TestCase
+
+use PHPUnit\Framework\TestCase;
+
+class CommonMarkTest extends TestCase
 {
     const SPEC_URL = 'https://raw.githubusercontent.com/jgm/stmd/master/spec.txt';
 

test/ParsedownTest.php

@@ -1,6 +1,8 @@
 <?php
 
-class ParsedownTest extends PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+
+class ParsedownTest extends TestCase
 {
     final function __construct($name = null, array $data = array(), $dataName = '')
     {

test/bootstrap.php

@@ -1,7 +1,3 @@
 <?php
 
 include 'Parsedown.php';
-
-if ( ! class_exists('\PHPUnit_Framework_TestCase')) {
-    class_alias('\PHPUnit\Framework\TestCase', '\PHPUnit_Framework_TestCase');
-}