    @Test
    public void testGetBody() throws Exception {

        Inventory update = new Inventory();
        update.setIdentifier(123);
        update.setPrice(new BigDecimal("1.00"));
        String body = new UpdateInventoryRequest(update, "inventory_id", "unit_price").getBody();
        assertEquals("{\"inventory_id\":123,\"unit_price\":1.00}", body);
    }