.addEqualityGroup(original, same)
        .addEqualityGroup(reverse)
        .addEqualityGroup(diff2)
        .testEquals();
  }

  private static final Function<String, Integer> LENGTH_FUNCTION =
      new Function<String, Integer>() {
        @Override
        public Integer apply(String input) {
          return input.length();
        }
      };

  public void testAsMap() {

        .addEqualityGroup(original, same)
        .addEqualityGroup(reverse)
        .addEqualityGroup(diff2)
        .testEquals();
  }

  private static final Function<String, Integer> LENGTH_FUNCTION =
      new Function<String, Integer>() {
        @Override
        public Integer apply(String input) {
          return input.length();
        }
      };

  public void testAsMap() {