Add missing connection test

Author: DanielBadura

tests/Unit/Store/StreamDoctrineDbalStoreTest.php

@@ -25,6 +25,7 @@
 use EmptyIterator;
 use Patchlevel\EventSourcing\Message\Message;
 use Patchlevel\EventSourcing\Message\Serializer\HeadersSerializer;
+use Patchlevel\EventSourcing\Metadata\Event\EventRegistry;
 use Patchlevel\EventSourcing\Serializer\EventSerializer;
 use Patchlevel\EventSourcing\Serializer\SerializedEvent;
 use Patchlevel\EventSourcing\Store\ArchivedHeader;
@@ -43,6 +44,7 @@
 use Patchlevel\EventSourcing\Store\LockingNotImplemented;
 use Patchlevel\EventSourcing\Store\MissingDataForStorage;
 use Patchlevel\EventSourcing\Store\StreamDoctrineDbalStore;
+use Patchlevel\EventSourcing\Store\TaggableDoctrineDbalStore;
 use Patchlevel\EventSourcing\Store\UniqueConstraintViolation;
 use Patchlevel\EventSourcing\Store\UnsupportedCriterion;
 use Patchlevel\EventSourcing\Store\WrongQueryResult;
@@ -3005,4 +3007,19 @@ public function testWaitNotPostgres(): void
         );
         $doctrineDbalStore->wait(100);
     }
+
+    public function testConnection(): void
+    {
+        $connection = $this->createMock(Connection::class);
+        $eventSerializer = $this->createMock(EventSerializer::class);
+        $headersSerializer = $this->createMock(HeadersSerializer::class);
+
+        $doctrineDbalStore = new StreamDoctrineDbalStore(
+            $connection,
+            $eventSerializer,
+            $headersSerializer,
+        );
+
+        self::assertSame($connection, $doctrineDbalStore->connection());
+    }
 }