Junit testing case

Here are my methods I want to test.

Scanner scan = new Scanner(System.in).useDelimiter("");

public String prompt_FirstName() {    System.out.println("First Name:");    String firstName = scan.next();    return firstName;}

Here's what i have so far

@Testpublic void testPrompt_first(){    Menu inputOutput= new Menu();    String input = "Jane";    InputStream in = new ByteArrayInputStream(input.getBytes());    System.setIn(in);    String s = inputOutput.prompt_FirstName();    assertEquals("Jane", s);}