…n when specifying $_SERVER['KERNEL_DIR'] (iteman)This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes#11370).Discussion----------[FrameworkBundle] avoid raising unexpected RuntimeException when specifying $_SERVER['KERNEL_DIR']| Q             | A| ------------- | ---| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | -| License       | MIT| Doc PR        | -Since v2.5.0 (exactlye778cf1), all tests that use WebTestCase are to be errors "RuntimeException: Unable to guess the Kernel directory." even though $_SERVER['KERNEL_DIR'] is specified. This has been preventing another test runner (e.g. [MakeGood](https://github.com/piece/makegood)) from running tests for a Symfony application without overriding KernelTestCase::getPhpUnitXmlDir() as follows.The bootstrap file for testing in the app directory:```php<?php...$_SERVER['KERNEL_DIR'] = __DIR__;require_once dirname(__DIR__) . '/var/bootstrap.php.cache';```console output:```consolePHPUnit 4.1.3 by Sebastian Bergmann.EEAcme\DemoBundle\Tests\Controller\DemoController [ ] Index [ ] Secure sectionTime: 146 ms, Memory: 9.50MbThere were 2 errors:1) Acme\DemoBundle\Tests\Controller\DemoControllerTest::testIndexRuntimeException: Unable to guess the Kernel directory./path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php:56/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php:103/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php:156/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php:137/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Test/WebTestCase.php:33/path/to/symfony-application/src/Acme/DemoBundle/Tests/Controller/DemoControllerTest.php:11/path/to/eclipse/plugins/com.piece_framework.makegood.stagehandtestrunner_3.1.0.v201407050319/resources/php/vendor/piece/stagehand-testrunner/src/Runner/PHPUnitRunner.php:81/path/to/eclipse/plugins/com.piece_framework.makegood.stagehandtestrunner_3.1.0.v201407050319/resources/php/vendor/piece/stagehand-testrunner/src/Process/TestRunner.php:100/path/to/eclipse/plugins/com.piece_framework.makegood.stagehandtestrunner_3.1.0.v201407050319/resources/php/vendor/piece/stagehand-testrunner/src/CLI/TestRunnerApplication/Command/PluginCommand.php:149/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Component/Console/Command/Command.php:252/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:887/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:193/path/to/symfony-application/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:124...```Commits-------6f58674 [FrameworkBundle] changed KernelTestCase::getKernelClass() to check $_SERVER['KERNEL_DIR'] before invoking getPhpUnitXmlDir()