@Test public void testEmpty() { Exchange raw = new Exchange(); raw.id = 1; Exchange exchange = io(raw); assertTrue(exchange != raw); ExchangeExtension extension = new ExchangeExtension(exchange); assertNull(extension.getAmount()); assertNull(extension.getFormula()); assertNull(extension.getPropertyId()); assertNull(extension.getUnitId()); assertFalse(extension.isValid()); }