diff --git a/tests/ContainsManyTest.php b/tests/ContainsManyTest.php
index 40fd90b5e..357b4ab8a 100644
--- a/tests/ContainsManyTest.php
+++ b/tests/ContainsManyTest.php
@@ -322,7 +322,6 @@ private function createInvoiceEntityWithLogger(&$log): Invoice
             return $line;
         };
         \Closure::bind(static fn () => $invoice->getField($invoice->fieldName()->lines)->getReference()->model = $createTheirModelFx, null, Reference::class)();
-
         $invoiceEntity = $invoice->loadBy($invoice->fieldName()->ref_no, 'A1');
 
         $invoice->getField($invoice->fieldName()->lines)
@@ -476,4 +475,49 @@ public function testUnmanagedDataModificationException(): void
         $this->expectExceptionMessageIs('Contained model data cannot be modified directly');
         $i->set($i->fieldName()->lines, [0]);
     }
+
+    public function testSortOrder(): void
+    {
+        $i = new Invoice($this->db);
+        $i = $i->loadBy($i->fieldName()->ref_no, 'A1');
+        $l = $i->lines;
+
+        $l->insert([
+            $l->fieldName()->id => 1,
+            $l->fieldName()->vat_rate_id => 1,
+            $l->fieldName()->price => 10,
+            $l->fieldName()->qty => 2,
+        ]);
+        $l->insert([
+            $l->fieldName()->id => 2,
+            $l->fieldName()->vat_rate_id => 1,
+            $l->fieldName()->price => 15,
+            $l->fieldName()->qty => 5,
+        ]);
+        $l->insert([
+            $l->fieldName()->id => 3,
+            $l->fieldName()->vat_rate_id => 1,
+            $l->fieldName()->price => 5,
+            $l->fieldName()->qty => 6,
+        ]);
+        $l->insert([
+            $l->fieldName()->id => 4,
+            $l->fieldName()->vat_rate_id => 1,
+            $l->fieldName()->price => 15,
+            $l->fieldName()->qty => 3,
+        ]);
+        $l->insert([
+            $l->fieldName()->id => 5,
+            $l->fieldName()->vat_rate_id => 1,
+            $l->fieldName()->price => 9,
+            $l->fieldName()->qty => 2,
+        ]);
+
+        $expectedSortOrder = [5, 3, 1, 4, 3];
+        $ids = [];
+        foreach ($i->lines->setOrder(['price' => 'ASC', 'qty' => 'ASC']) as $line) {
+            $ids[] = $line->id;
+        }
+        self::assertSame($expectedSortOrder, $ids);
+    }
 }