Merge branch '4.4'

* 4.4:
  [Bridge/PhpUnit] fix looking for composer
  cs fix
  [Mailer] fixed Mailgun support when a response is not JSON as expected
  [4.3] Cleanup tests
  Cleanup tests
  [Finder] Prevent unintentional file locks in Windows
  [FrameworkBundle] Fix about command not showing .env vars
  [DomCrawler] Fix FileFormField PHPDoc
  [Mailer] Remove the default dispatcher in AbstractTransport
  Fix #33395 PHP 5.3 compatibility

Author: nicolas-grekas

DeprecationErrorHandler.php

@@ -307,7 +307,7 @@ private function displayDeprecations($groups, $configuration)
     private static function getPhpUnitErrorHandler()
     {
         if (!isset(self::$isAtLeastPhpUnit83)) {
-            self::$isAtLeastPhpUnit83 = class_exists(ErrorHandler::class) && method_exists(ErrorHandler::class, '__invoke');
+            self::$isAtLeastPhpUnit83 = class_exists('PHPUnit\Util\ErrorHandler') && method_exists('PHPUnit\Util\ErrorHandler', '__invoke');
         }
         if (!self::$isAtLeastPhpUnit83) {
             return 'PHPUnit\Util\ErrorHandler::handleError';

bin/simple-phpunit.php

@@ -96,11 +96,12 @@
     }
 }
 
-$COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar') || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar 2> /dev/null`))
+$COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar')
+    || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar 2> /dev/null`))
+    || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer`) : `which composer 2> /dev/null`))
     ? $PHP.' '.escapeshellarg($COMPOSER)
     : 'composer';
 
-
 $SYMFONY_PHPUNIT_REMOVE = $getEnvVar('SYMFONY_PHPUNIT_REMOVE', 'phpspec/prophecy'.($PHPUNIT_VERSION < 6.0 ? ' symfony/yaml': ''));
 $configurationHash = md5(implode(PHP_EOL, array(md5_file(__FILE__), $SYMFONY_PHPUNIT_REMOVE, (int) $PHPUNIT_REMOVE_RETURN_TYPEHINT)));
 $PHPUNIT_VERSION_DIR=sprintf('phpunit-%s-%d', $PHPUNIT_VERSION, $PHPUNIT_REMOVE_RETURN_TYPEHINT);