Merge branch '3.4' into 4.1

* 3.4:
  [Tests] Change to willThrowException
  [Console] fix PHPDoc in Command
  Fix wrong calls to clearstatcache
  Add Vietnamese translation for validators
  Allow running PHPUnit with "xdebug.scream" ON
  [Yaml] detect circular references

Author: fabpot

Tests/Command/TranslationDebugCommandTest.php

@@ -103,7 +103,7 @@ public function testDebugInvalidDirectory()
         $kernel->expects($this->once())
             ->method('getBundle')
             ->with($this->equalTo('dir'))
-            ->will($this->throwException(new \InvalidArgumentException()));
+            ->willThrowException(new \InvalidArgumentException());
 
         $tester = $this->createCommandTester(array(), array(), $kernel);
         $tester->execute(array('locale' => 'en', 'bundle' => 'dir'));

Tests/Templating/Loader/TemplateLocatorTest.php

@@ -60,7 +60,7 @@ public function testThrowsExceptionWhenTemplateNotFound()
         $fileLocator
             ->expects($this->once())
             ->method('locate')
-            ->will($this->throwException(new \InvalidArgumentException($errorMessage)))
+            ->willThrowException(new \InvalidArgumentException($errorMessage))
         ;
 
         $locator = new TemplateLocator($fileLocator);