Fixed deprecated TypeTestCase base class isages

Tests/Form/Type/AdminTypeTest.php

@@ -12,7 +12,7 @@
 namespace Sonata\AdminBundle\Tests\Form\Type;
 
 use Sonata\AdminBundle\Form\Type\AdminType;
-use Symfony\Component\Form\Tests\Extension\Core\Type\TypeTestCase;
+use Symfony\Component\Form\Test\TypeTestCase;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class AdminTypeTest extends TypeTestCase

Tests/Form/Type/Filter/DateTimeRangeTypeTest.php

@@ -3,7 +3,7 @@
 namespace Sonata\AdminBundle\Tests\Form\Type;
 
 use Sonata\AdminBundle\Form\Type\Filter\DateTimeRangeType;
-use Symfony\Component\Form\Tests\Extension\Core\Type\TypeTestCase;
+use Symfony\Component\Form\Test\TypeTestCase;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class DateTimeRangeTypeTest extends TypeTestCase

Tests/Form/Type/ModelHiddenTypeTest.php

@@ -13,7 +13,7 @@ namespace Sonata\AdminBundle\Tests\Form\Type;
 
 use Sonata\AdminBundle\Form\Type\ModelHiddenType;
 
-use Symfony\Component\Form\Tests\Extension\Core\Type\TypeTestCase;
+use Symfony\Component\Form\Test\TypeTestCase;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class ModelHiddenTypeTest extends TypeTestCase