diff --git a/demos/form-control/multiline.php b/demos/form-control/multiline.php
index 399cb50ab0..d5a605c9f1 100644
--- a/demos/form-control/multiline.php
+++ b/demos/form-control/multiline.php
@@ -60,7 +60,7 @@ protected function init(): void
         ]);
         $this->addExpression('total', [
             'expr' => function (Model $row) {
-                return $row->get('qty') * $row->get('box');
+                return $row->expr('[qty] * [box]'); // @phpstan-ignore-line
             },
             'type' => 'integer',
             'ui' => ['multiline' => [Form\Control\Multiline::TABLE_CELL => ['width' => 1, 'class' => 'blue']]],
@@ -68,11 +68,20 @@ protected function init(): void
     }
 });
 
-$inventory = new $inventoryItemClass(new Persistence\Array_(), ['countryPersistence' => $app->db]);
+$inventory = new $inventoryItemClass($app->db, ['table' => 'atk4_ui_multiline_test', 'countryPersistence' => $app->db]);
+
+$migrator = new \Atk4\Data\Schema\Migrator($inventory);
+if (!$migrator->isTableExists($inventory->table)) {
+    $migrator->create();
+}
 
 // Populate some data.
 $total = 0;
 for ($i = 1; $i < 3; ++$i) {
+    if ($inventory->tryLoad($i) !== null) {
+        continue;
+    }
+
     $entity = $inventory->createEntity();
     $entity->set('id', $i);
     $entity->set('inv_date', new \DateTime());
diff --git a/tests-behat/multiline.feature b/tests-behat/multiline.feature
new file mode 100644
index 0000000000..178b21b6a3
--- /dev/null
+++ b/tests-behat/multiline.feature
@@ -0,0 +1,7 @@
+Feature: Multiline
+
+  Scenario:
+    Given I am on "form-control/multiline.php"
+    When I fill in "-box" with "3693"
+    Then I press button "Save"
+    Then Toast display should contain text '"box": 3693,'