diff --git a/tests/ORM/Functional/Driver/Common/Integration/Case321/CaseTest.php b/tests/ORM/Functional/Driver/Common/Integration/Case321/CaseTest.php
new file mode 100644
index 00000000..110b98a3
--- /dev/null
+++ b/tests/ORM/Functional/Driver/Common/Integration/Case321/CaseTest.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321;
+
+use Cycle\ORM\Select;
+use Cycle\ORM\Tests\Functional\Driver\Common\BaseTest;
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\IntegrationTestTrait;
+use Cycle\ORM\Tests\Traits\TableTrait;
+
+abstract class CaseTest extends BaseTest
+{
+    use IntegrationTestTrait;
+    use TableTrait;
+
+    public function setUp(): void
+    {
+        // Init DB
+        parent::setUp();
+        $this->makeTables();
+
+        $this->loadSchema(__DIR__ . '/schema.php');
+    }
+
+    public function test1(): void
+    {
+        $user = new Entity\User1();
+
+        // Store changes and calc write queries
+        $this->captureWriteQueries();
+        $this->save($user);
+
+        // Check write queries count
+        $this->assertNumWrites(1);
+    }
+
+    public function test2(): void
+    {
+        $user = new Entity\User2();
+
+        // Store changes and calc write queries
+        $this->captureWriteQueries();
+        $this->save($user);
+
+        // Check write queries count
+        $this->assertNumWrites(1);
+    }
+
+    private function makeTables(): void
+    {
+        // Make tables
+        $this->makeTable('user1', [
+            'id' => 'primary', // autoincrement
+        ]);
+
+        $this->makeTable('user2', [
+            'id' => 'primary', // autoincrement
+        ]);
+    }
+}
diff --git a/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User1.php b/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User1.php
new file mode 100644
index 00000000..292e31c5
--- /dev/null
+++ b/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User1.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\Entity;
+
+class User1
+{
+    public ?int $id = null;
+}
diff --git a/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User2.php b/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User2.php
new file mode 100644
index 00000000..c6f5296d
--- /dev/null
+++ b/tests/ORM/Functional/Driver/Common/Integration/Case321/Entity/User2.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\Entity;
+
+class User2
+{
+    public int $id;
+}
diff --git a/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php b/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php
new file mode 100644
index 00000000..e4862582
--- /dev/null
+++ b/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+use Cycle\ORM\Mapper\Mapper;
+use Cycle\ORM\SchemaInterface as Schema;
+use Cycle\ORM\Select\Source;
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\Entity\User1;
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\Entity\User2;
+
+return [
+    'user1' => [
+        Schema::ENTITY => User1::class,
+        Schema::MAPPER => Mapper::class,
+        Schema::SOURCE => Source::class,
+        Schema::DATABASE => 'default',
+        Schema::TABLE => 'user1',
+        Schema::PRIMARY_KEY => ['id'],
+        Schema::FIND_BY_KEYS => ['id'],
+        Schema::COLUMNS => [
+            'id' => 'id',
+        ],
+        Schema::RELATIONS => [],
+        Schema::SCOPE => null,
+        Schema::TYPECAST => [
+            'id' => 'int',
+        ],
+        Schema::SCHEMA => [],
+    ],
+    'user2' => [
+        Schema::ENTITY => User2::class,
+        Schema::MAPPER => Mapper::class,
+        Schema::SOURCE => Source::class,
+        Schema::DATABASE => 'default',
+        Schema::TABLE => 'user2',
+        Schema::PRIMARY_KEY => ['id'],
+        Schema::FIND_BY_KEYS => ['id'],
+        Schema::COLUMNS => [
+            'id' => 'id',
+        ],
+        Schema::RELATIONS => [],
+        Schema::SCOPE => null,
+        Schema::TYPECAST => [
+            'id' => 'int',
+        ],
+        Schema::SCHEMA => [],
+    ],
+];
diff --git a/tests/ORM/Functional/Driver/MySQL/Integration/Case321/CaseTest.php b/tests/ORM/Functional/Driver/MySQL/Integration/Case321/CaseTest.php
new file mode 100644
index 00000000..7b3318f0
--- /dev/null
+++ b/tests/ORM/Functional/Driver/MySQL/Integration/Case321/CaseTest.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\MySQL\Integration\Case321;
+
+// phpcs:ignore
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\CaseTest as CommonClass;
+
+/**
+ * @group driver
+ * @group driver-mysql
+ */
+class CaseTest extends CommonClass
+{
+    public const DRIVER = 'mysql';
+}
diff --git a/tests/ORM/Functional/Driver/Postgres/Integration/Case321/CaseTest.php b/tests/ORM/Functional/Driver/Postgres/Integration/Case321/CaseTest.php
new file mode 100644
index 00000000..0b591e54
--- /dev/null
+++ b/tests/ORM/Functional/Driver/Postgres/Integration/Case321/CaseTest.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\Postgres\Integration\Case321;
+
+// phpcs:ignore
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\CaseTest as CommonClass;
+
+/**
+ * @group driver
+ * @group driver-postgres
+ */
+class CaseTest extends CommonClass
+{
+    public const DRIVER = 'postgres';
+}
diff --git a/tests/ORM/Functional/Driver/SQLServer/Integration/Case321/CaseTest.php b/tests/ORM/Functional/Driver/SQLServer/Integration/Case321/CaseTest.php
new file mode 100644
index 00000000..fe4fbffb
--- /dev/null
+++ b/tests/ORM/Functional/Driver/SQLServer/Integration/Case321/CaseTest.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\SQLServer\Integration\Case321;
+
+// phpcs:ignore
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\CaseTest as CommonClass;
+
+/**
+ * @group driver
+ * @group driver-sqlserver
+ */
+class CaseTest extends CommonClass
+{
+    public const DRIVER = 'sqlserver';
+}
diff --git a/tests/ORM/Functional/Driver/SQLite/Integration/Case321/CaseTest.php b/tests/ORM/Functional/Driver/SQLite/Integration/Case321/CaseTest.php
new file mode 100644
index 00000000..8a5af565
--- /dev/null
+++ b/tests/ORM/Functional/Driver/SQLite/Integration/Case321/CaseTest.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\ORM\Tests\Functional\Driver\SQLite\Integration\Case321;
+
+// phpcs:ignore
+use Cycle\ORM\Tests\Functional\Driver\Common\Integration\Case321\CaseTest as CommonClass;
+
+/**
+ * @group driver
+ * @group driver-sqlite
+ */
+class CaseTest extends CommonClass
+{
+    public const DRIVER = 'sqlite';
+}