@Test
public void testWrongConstructor() {

	String inputCommand = "py4j.examples.Stack\ni5\ne\n";
	try {
		command.execute("i", new BufferedReader(new StringReader(inputCommand)), writer);
		assertTrue(sWriter.toString().startsWith("!x"));
	} catch (Exception e) {
		e.printStackTrace();
		fail();
	}
}