@Test
public void containsSubstring_shouldReturnsTrue_whenSeedIsPresentInsideString_ignoreCase() throws
    Exception {

  assertEquals(true, validateTor.containsSubstring("abcdEfgHiJK", "def"));
  assertEquals(true, validateTor.containsSubstring("abcdEfgHiJK", "DEFG"));
  assertEquals(true, validateTor.containsSubstring("abcdEfgHiJK", "f"));
  assertEquals(true, validateTor.containsSubstring("abcdEfgHiJK", "F"));
  assertEquals(true, validateTor.containsSubstring("abcdEfgHiJK", "E"));
}