ImmutableBiMap<String, Integer> map =
        new Builder<String, Integer>().put(immutableEntry("one", 1)).build();
    assertMapEquals(map, "one", 1);
  }

  public void testBuilder() {
    ImmutableBiMap<String, Integer> map =
        ImmutableBiMap.<String, Integer>builder()
            .put("one", 1)
            .put("two", 2)
            .put("three", 3)
            .put("four", 4)

    ImmutableSortedMap<String, Integer> map =
        ImmutableSortedMap.<String, Integer>naturalOrder().put("one", 1).build();
    assertMapEquals(map, "one", 1);
  }

  public void testBuilder() {
    ImmutableSortedMap<String, Integer> map =
        ImmutableSortedMap.<String, Integer>naturalOrder()
            .put("one", 1)
            .put("two", 2)
            .put("three", 3)