minor symfony#18287 [3.0] fix mocking of some methods (xabbuh)

This PR was merged into the 3.0 branch.

Discussion
----------

[3.0] fix mocking of some methods

| Q             | A
| ------------- | ---
| Branch?       | 3.0
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | items 1 and 2 of sebastianbergmann/phpunit-mock-objects#299 (comment)
| License       | MIT
| Doc PR        |

Commits
-------

07308e9 [3.0] fix mocking of some methods

Author: Tobion

src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php

@@ -623,8 +623,6 @@ public function testNoViolationIfAllowExtraData()
 
         $context->expects($this->never())
             ->method('addViolation');
-        $context->expects($this->never())
-            ->method('addViolationAt');
 
         $this->validator->initialize($context);
         $this->validator->validate($form, new Form());

src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorExtensionTest.php

@@ -38,10 +38,6 @@ public function test2Dot5ValidationApi()
             ->method('addPropertyConstraint')
             ->with('children', $this->isInstanceOf('Symfony\Component\Validator\Constraints\Valid'));
 
-        $validator
-            ->expects($this->never())
-            ->method('getMetadataFactory');
-
         $extension = new ValidatorExtension($validator);
         $guesser = $extension->loadTypeGuesser();