[Cache] fix test

Author: nicolas-grekas

src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php

@@ -13,6 +13,7 @@
 
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Driver;
+use Doctrine\DBAL\Driver\AbstractMySQLDriver;
 use Doctrine\DBAL\DriverManager;
 use Doctrine\DBAL\Schema\Schema;
 use Doctrine\DBAL\Version;
@@ -87,7 +88,7 @@ public function testConfigureSchemaTableExists()
  private function createConnectionMock()
  {
  $connection = $this->createMock(Connection::class);
- $driver = $this->createMock(Driver::class);
+ $driver = $this->createMock(AbstractMySQLDriver::class);
  $driver->expects($this->any())
  ->method('getName')
  ->willReturn('pdo_mysql');