public abstract boolean compare(A actual, E expected);
@Test
  public void testTransforming_both_compare() {
    assertThat(HYPHENS_MATCH_COLONS.compare("mailing-list", "abcdefg:hij")).isTrue();
    assertThat(HYPHENS_MATCH_COLONS.compare("chat-room", "abcd:efghij")).isTrue();
    assertThat(HYPHENS_MATCH_COLONS.compare("chat-room", "abcdefg:hij")).isFalse();
  }