Set<Integer> values = bimap.values();
    assertEquals(newHashSet(1, 2, 3, 4), values);
    assertThat(values).containsExactly(1, 2, 3, 4).inOrder();
  }

  public void testDoubleInverse() {
    ImmutableBiMap<String, Integer> bimap =
        ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2));
    assertThat(bimap.inverse().inverse()).isSameInstanceAs(bimap);
  }

  @J2ktIncompatible