diff --git a/tests/PHPUnit/Service/MollieApi/ShipmentTest.php b/tests/PHPUnit/Service/MollieApi/ShipmentTest.php
index 55ab5cbcd..acf0818ca 100644
--- a/tests/PHPUnit/Service/MollieApi/ShipmentTest.php
+++ b/tests/PHPUnit/Service/MollieApi/ShipmentTest.php
@@ -135,7 +135,7 @@ public function testShipItem()
             ->method('createShipment')
             ->willReturn($this->createMock(MollieShipment::class));
 
-        $this->mollieOrder->method('lines')->willReturn($this->createMock(OrderLineCollection::class));
+        $this->mollieOrder->method('lines')->willReturn([]);
 
 
 
@@ -151,7 +151,7 @@ public function testShipItemCannotBeShippedException()
             ->expects($this->once())
             ->method('createShipment')
             ->willThrowException(new ApiException());
-        $this->mollieOrder->method('lines')->willReturn($this->createMock(OrderLineCollection::class));
+        $this->mollieOrder->method('lines')->willReturn([]);
 
         $this->expectException(MollieOrderCouldNotBeShippedException::class);