assertThat(empty).isEmpty();
  }

  public void testCharacterSplitWithTrim() {
    String jacksons = "arfo(Marlon)aorf, (Michael)orfa, afro(Jackie)orfa, ofar(Jemaine), aff(Tito)";
    Iterable<String> family =
        COMMA_SPLITTER
            .trimResults(CharMatcher.anyOf("afro").or(CharMatcher.whitespace()))
            .split(jacksons);
    assertThat(family)