merged branch willdurand/validator-assertion (PR #4110)

Commits
-------

9328b28 [Validator] Added missing assertion

Discussion
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[Validator] Added missing assertion

There was no assertion before.

src/Symfony/Component/Validator/Tests/Constraints/TypeValidatorTest.php

@@ -52,6 +52,9 @@ class TypeValidatorTest extends \PHPUnit_Framework_TestCase
 
     public function testEmptyIsInvalidIfNoString()
     {
+        $this->context->expects($this->once())
+            ->method('addViolation');
+
         $this->validator->validate('', new Type(array('type' => 'integer')));
     }