Clarify the specific returned driver connection type

tests/Doctrine/Tests/DBAL/Functional/Driver/PDOSqlsrv/DriverTest.php

@@ -3,7 +3,7 @@
 namespace Doctrine\Tests\DBAL\Functional\Driver\PDOSqlsrv;
 
 use Doctrine\DBAL\Driver as DriverInterface;
-use Doctrine\DBAL\Driver\Connection;
+use Doctrine\DBAL\Driver\PDOConnection;
 use Doctrine\DBAL\Driver\PDOSqlsrv\Driver;
 use Doctrine\Tests\DBAL\Functional\Driver\AbstractDriverTest;
 use Doctrine\Tests\TestUtil;
@@ -40,7 +40,7 @@ class DriverTest extends AbstractDriverTest
     /**
      * @param int[]|string[] $driverOptions
      */
-    protected function getConnection(array $driverOptions) : Connection
+    private function getConnection(array $driverOptions) : PDOConnection
     {
         $params = TestUtil::getConnectionParams();
 

tests/Doctrine/Tests/DBAL/Functional/Ticket/DBAL630Test.php

@@ -3,6 +3,7 @@
 namespace Doctrine\Tests\DBAL\Functional\Ticket;
 
 use Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Driver\PDOConnection;
 use Doctrine\DBAL\ParameterType;
 use Doctrine\Tests\DbalFunctionalTestCase;
 use PDO;
@@ -38,7 +39,7 @@ class DBAL630Test extends DbalFunctionalTestCase
     protected function tearDown() : void
     {
         if ($this->running) {
-            $this->connection->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+            $this->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
         }
 
         parent::tearDown();
@@ -72,7 +73,7 @@ class DBAL630Test extends DbalFunctionalTestCase
 
     public function testBooleanConversionBoolParamEmulatedPrepares() : void
     {
-        $this->connection->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
+        $this->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 
         $platform = $this->connection->getDatabasePlatform();
 
@@ -96,7 +97,7 @@ class DBAL630Test extends DbalFunctionalTestCase
         ?bool $statementValue,
         ?bool $databaseConvertedValue
     ) : void {
-        $this->connection->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
+        $this->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 
         $platform = $this->connection->getDatabasePlatform();
 
@@ -120,7 +121,7 @@ class DBAL630Test extends DbalFunctionalTestCase
         ?bool $statementValue,
         bool $databaseConvertedValue
     ) : void {
-        $this->connection->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
+        $this->getWrappedConnection()->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 
         $platform = $this->connection->getDatabasePlatform();
 
@@ -170,4 +171,12 @@ class DBAL630Test extends DbalFunctionalTestCase
             [null, null],
         ];
     }
+
+    private function getWrappedConnection() : PDOConnection
+    {
+        $connection = $this->connection->getWrappedConnection();
+        self::assertInstanceOf(PDOConnection::class, $connection);
+
+        return $connection;
+    }
 }