@Test
 public final void testServerUsernameNullString() {
   String username = null;
   config.serverUsername(username);
   assertTrue(
       "Username is not String (nulls and others should not be allowed)",
       config.serverUsername() instanceof java.lang.String);
 }
 @Test
 public final void testServerUsernameString() {
   String username = "******";
   config.serverUsername(username);
   assertTrue("Failed to retrieve set username", config.serverUsername().equals(username));
 }