new EqualsTester()
        .addEqualityGroup(Invokable.from(getMethod), Invokable.from(getMethod))
        .addEqualityGroup(Invokable.from(setMethod))
        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(getMethod))
        .addEqualityGroup(new TypeToken<List<String>>() {}.method(getMethod))
        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(setMethod))

      Set<Set<Integer>> powerSet2 = powerSet(elements);
      new EqualsTester()
          .addEqualityGroup(powerSet1, powerSet2, toHashSets(powerSet1))
          .addEqualityGroup(ImmutableSet.of())
          .addEqualityGroup(ImmutableSet.of(9999999))
          .addEqualityGroup("notASet")
          .testEquals();
      assertEquals(toHashSets(powerSet1).hashCode(), powerSet1.hashCode());
    }

    new EqualsTester()
        .addEqualityGroup(Invokable.from(getMethod), Invokable.from(getMethod))
        .addEqualityGroup(Invokable.from(setMethod))
        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(getMethod))
        .addEqualityGroup(new TypeToken<List<String>>() {}.method(getMethod))
        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(setMethod))

    MapDifference<Integer, String> diff2 = Maps.difference(left, right2);

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

  public void testMapDifferencePredicateTypical() {