allow bin/phpunit to work with phpunit 10

Author: jrushlow

symfony/phpunit-bridge/5.3/bin/phpunit

@@ -6,9 +6,15 @@ if (!ini_get('date.timezone')) {
 }
 
 if (is_file(dirname(__DIR__).'/vendor/phpunit/phpunit/phpunit')) {
-    define('PHPUNIT_COMPOSER_INSTALL', dirname(__DIR__).'/vendor/autoload.php');
-    require PHPUNIT_COMPOSER_INSTALL;
-    PHPUnit\TextUI\Command::main();
+    if (class_exists(PHPUnit\TextUI\Command::class)) {
+        // PHPUnit < 9.x
+        define('PHPUNIT_COMPOSER_INSTALL', dirname(__DIR__).'/vendor/autoload.php');
+        require PHPUNIT_COMPOSER_INSTALL;
+        PHPUnit\TextUI\Command::main();
+    } else {
+        // PHPUnit >= 10.0
+        require dirname(__DIR__).'/vendor/phpunit/phpunit/phpunit';
+    }
 } else {
     if (!is_file(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php')) {
         echo "Unable to find the `simple-phpunit.php` script in `vendor/symfony/phpunit-bridge/bin/`.\n";