@Test
public void
isAlphanumeric_shouldReturnFalse_whenStringContainsSpecialCharacterOtherThanAlphaNumericCharacters()
    throws Exception {

  assertEquals(false, validateTor.isAlphanumeric("#"));
  assertEquals(false, validateTor.isAlphanumeric("%"));
  assertEquals(false, validateTor.isAlphanumeric("\r"));
  assertEquals(false, validateTor.isAlphanumeric("123("));
  assertEquals(false, validateTor.isAlphanumeric("123(abc"));
  assertEquals(false, validateTor.isAlphanumeric(" ")); // space character
  assertEquals(false, validateTor.isAlphanumeric("  ")); //tab character
}