### Question:
Main { public static char[] unfold(String s) throws GeneralSecurityException { char[] passwordCopy = null; if (null != s) { if (s.startsWith(__CRYPT)) { passwordCopy = decrypt(s).toCharArray(); } else if (s.startsWith(__OBFUSCATE)) { passwordCopy = deobfuscate(s).toCharArray(); } else if (s.equalsIgnoreCase(__CONSOLE)) { char[] passwordArray = System.console().readPassword("Please enter the password: "); passwordCopy = Arrays.copyOf(passwordArray, passwordArray.length); Arrays.fill(passwordArray, ' '); } else { passwordCopy = s.toCharArray(); } } return passwordCopy; }  static void main(String[] arg); static String obfuscate(String s); static String deobfuscate(String s); static String encrypt(String s); static String decrypt(String s); static char[] unfold(String s); static final String __OBFUSCATE; static final String __CRYPT; static final String __CONSOLE; }### Answer:
@Test public void testUnfold() throws Exception { String expectedA = "So Long, and Thanks for All the Fish"; String obfuscated = Main.obfuscate(expectedA); String expectedB = "How many roads must a man walk down?"; String encrypted = Main.encrypt(expectedB); Assert.assertEquals(Main.unfold(obfuscated), expectedA.toCharArray()); Assert.assertEquals(Main.unfold(encrypted), expectedB.toCharArray()); }