@Test
public void testCheckShipment_shipped() {

    StockOpImpl operator = new StockOpImpl();
    Shipment shipment = new Shipment();
    shipment.setShippedDate(new DateTime());
    shipment.setCost(100);
    ShipmentStatus actual = operator.checkShipment(shipment);
    assertThat(actual, is(ShipmentStatus.COMPLETED));
}