public static boolean isAnonymousUser(final String customerId) {
    return customerId != null && customerId.toLowerCase(Locale.ROOT).equals(
        CONFLUENT_SUPPORT_CUSTOMER_ID_DEFAULT);
  }
@Test
  public void testInvalidAnonymousUser() {
    String[] invalidIds = Stream.concat(
        CustomerIdExamples.INVALID_ANONYMOUS_IDS.stream(),
        CustomerIdExamples.VALID_CUSTOMER_IDS.stream()).
        toArray(String[]::new);
    for (String invalidId : invalidIds) {
      assertFalse(invalidId + " is a valid anonymous user identifier",
          BaseSupportConfig.isAnonymousUser(invalidId));
    }
  }