Merge branch '3.3' into 3.4

* 3.3:
  Revert "bug #24105 [Filesystem] check permissions if dump target dir is missing (xabbuh)"
  [Filesystem] skip tests if not applicable
  [Fabbot] Do not run php-cs-fixer if there are no change in src/
  [Security] Fix exception when use_referer option is true and referer is not set or empty
  [HttpKernel] "controller.service_arguments" services should be public
  Get KERNEL_DIR through $_ENV too for KernelTestCase
  Get KERNEL_CLASS through $_ENV too
  check permissions if dump target dir is missing

Author: nicolas-grekas

Test/KernelTestCase.php

@@ -114,8 +114,9 @@ private static function getPhpUnitCliConfigArgument()
      */
     protected static function getKernelClass()
     {
-        if (isset($_SERVER['KERNEL_CLASS'])) {
-            if (!class_exists($class = $_SERVER['KERNEL_CLASS'])) {
+        if (isset($_SERVER['KERNEL_CLASS']) || isset($_ENV['KERNEL_CLASS'])) {
+            $class = isset($_SERVER['KERNEL_CLASS']) ? $_SERVER['KERNEL_CLASS'] : $_ENV['KERNEL_CLASS'];
+            if (!class_exists($class)) {
                 throw new \RuntimeException(sprintf('Class "%s" doesn\'t exist or cannot be autoloaded. Check that the KERNEL_CLASS value in phpunit.xml matches the fully-qualified class name of your Kernel or override the %s::createKernel() method.', $class, static::class));
             }
 
@@ -124,8 +125,8 @@ protected static function getKernelClass()
             @trigger_error(sprintf('Using the KERNEL_DIR environment variable or the automatic guessing based on the phpunit.xml / phpunit.xml.dist file location is deprecated since 3.4. Set the KERNEL_CLASS environment variable to the fully-qualified class name of your Kernel instead. Not setting the KERNEL_CLASS environment variable will throw an exception on 4.0 unless you override the %1$::createKernel() or %1$::getKernelClass() method.', static::class), E_USER_DEPRECATED);
         }
 
-        if (isset($_SERVER['KERNEL_DIR'])) {
-            $dir = $_SERVER['KERNEL_DIR'];
+        if (isset($_SERVER['KERNEL_DIR']) || isset($_ENV['KERNEL_DIR'])) {
+            $dir = isset($_SERVER['KERNEL_DIR']) ? $_SERVER['KERNEL_DIR'] : $_ENV['KERNEL_DIR'];
 
             if (!is_dir($dir)) {
                 $phpUnitDir = static::getPhpUnitXmlDir();