@Test
public void
isAlpha_shouldReturnFalse_whenStringContainsAnyOtherCharacterOtherThanAlphaCharacters()
    throws
    Exception {

  assertEquals(false, validateTor.isAlpha("1"));
  assertEquals(false, validateTor.isAlpha("&"));
  assertEquals(false, validateTor.isAlpha("abc123"));
  assertEquals(false, validateTor.isAlpha("123abc"));
  assertEquals(false, validateTor.isAlpha(" ")); // space character
  assertEquals(false, validateTor.isAlpha("  ")); //tab character
}