Merge branch '4.4' into 5.1

* 4.4:
  [Mailer] [Amazon] Ensure "ext-simplexml" is loaded if SesApiTransport is used
  Stop using deprecated trait
  [PhpUnitBridge] Lint files with PHP 5.5

ClassExistsMock.php

@@ -30,17 +30,23 @@ public static function withMockedClasses(array $classes)
 
     public static function class_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \class_exists($name, $autoload));
+        $name = ltrim($name, '\\');
+
+        return isset(self::$classes[$name]) ? (bool) self::$classes[$name] : \class_exists($name, $autoload);
     }
 
     public static function interface_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \interface_exists($name, $autoload));
+        $name = ltrim($name, '\\');
+
+        return isset(self::$classes[$name]) ? (bool) self::$classes[$name] : \interface_exists($name, $autoload);
     }
 
     public static function trait_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \trait_exists($name, $autoload));
+        $name = ltrim($name, '\\');
+
+        return isset(self::$classes[$name]) ? (bool) self::$classes[$name] : \trait_exists($name, $autoload);
     }
 
     public static function register($class)

Tests/DeprecationErrorHandler/DeprecationTest.php

@@ -15,12 +15,9 @@
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler;
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler\Deprecation;
 use Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerForV5;
-use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
 
 class DeprecationTest extends TestCase
 {
-    use SetUpTearDownTrait;
-
     private static $vendorDir;
     private static $prefixDirsPsr4;
 
@@ -261,7 +258,7 @@ private static function removeDir($dir)
         rmdir($dir);
     }
 
-    private static function doSetupBeforeClass()
+    public static function setupBeforeClass(): void
     {
         foreach (get_declared_classes() as $class) {
             if ('C' === $class[0] && 0 === strpos($class, 'ComposerAutoloaderInit')) {
@@ -281,7 +278,7 @@ private static function doSetupBeforeClass()
         }
     }
 
-    private static function doTearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         foreach (self::$prefixDirsPsr4 as [$prop, $loader, $prefixDirsPsr4]) {
             $prop->setValue($loader, $prefixDirsPsr4);