public abstract boolean compare(A actual, E expected);
@Test
  public void testTransforming_both_compare_nullInputValues() {
    try {
      HYPHENS_MATCH_COLONS.compare(null, "abcde:fghij");
      fail("Expected NullPointerException to be thrown but wasn't");
    } catch (NullPointerException expected) {
    }
    try {
      HYPHENS_MATCH_COLONS.compare("mailing-list", null);
      fail("Expected NullPointerException to be thrown but wasn't");
    } catch (NullPointerException expected) {
    }
  }