merged branch jakzal/form-validator-tests-fix (PR #7996)

This PR was merged into the 2.2 branch.

Discussion
----------

Fixed failing 2.2 tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

1858b96b7d introduced a mocked context and therefore `getExecutionContext()` is was renamed to `getMockExectionContext()`.

Commits
-------

ef87ba7 [Form] Fixed a method name.

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

@@ -293,17 +293,16 @@ class FormValidatorTest extends \PHPUnit_Framework_TestCase
 
     public function testDontExecuteFunctionNames()
     {
-        $context = $this->getExecutionContext();
-        $graphWalker = $context->getGraphWalker();
+        $context = $this->getMockExecutionContext();
         $object = $this->getMock('\stdClass');
         $options = array('validation_groups' => 'header');
         $form = $this->getBuilder('name', '\stdClass', $options)
             ->setData($object)
             ->getForm();
 
-        $graphWalker->expects($this->once())
-            ->method('walkReference')
-            ->with($object, 'header', 'data', true);
+        $context->expects($this->once())
+            ->method('validate')
+            ->with($object, 'data', 'header', true);
 
         $this->validator->initialize($context);
         $this->validator->validate($form, new Form());