@Test
public void isAlphanumeric_shouldReturnTrue_whenStringContainsOnlyAlphaAndNumericCharacters()
    throws
    Exception {

  assertEquals(true, validateTor.isAlphanumeric("abcd123"));
  assertEquals(true, validateTor.isAlphanumeric("12452abcd"));
  assertEquals(true, validateTor.isAlphanumeric("abcdEfgHiJK"));
}