@Test
  public void alternateSolution() {
    Integer actualResult = LengthOfLongestSubstring.alternateFunction(s);
    Integer expectResult = 3;

    assertEquals(expectResult, actualResult);
  }
  @Test
  public void lengthOfLongestSubstring() {
    Integer actualResult = LengthOfLongestSubstring.lengthOfLongestSubstring(s);
    Integer expectResult = 3;

    assertEquals(expectResult, actualResult);
  }