Merge branch 'bpo/2.9/#3549' into 2.9

Author: morozov

tests/Doctrine/Tests/DBAL/Functional/ConnectionTest.php

@@ -12,6 +12,7 @@
 use Doctrine\Tests\DbalFunctionalTestCase;
 use Error;
 use Exception;
+use PDO;
 use RuntimeException;
 use Throwable;
 use function in_array;
@@ -311,4 +312,16 @@ public function testDeterminesDatabasePlatformWhenConnectingToNonExistentDatabas
 
         $connection->close();
     }
+
+    /**
+     * @requires extension pdo_sqlite
+     */
+    public function testUserProvidedPDOConnection() : void
+    {
+        self::assertTrue(
+            DriverManager::getConnection([
+                'pdo' => new PDO('sqlite::memory:'),
+            ])->ping()
+        );
+    }
 }