assertThat(anyOf("ab").trimLeadingFrom("abacatbab")).isEqualTo("catbab");
  }

  private void doTestTrimLeadingFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertThat(is('-').trimLeadingFrom(in)).isEqualTo(out);
    assertThat(is('-').or(is('#')).trimLeadingFrom(in)).isEqualTo(out);
    assertThat(isNot('x').trimLeadingFrom(in)).isEqualTo(out);