Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();
    ImmutableSortedMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).build();
    ImmutableSortedMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).build();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapTwo, "four", 4, "one", 1, "three", 3, "two", 2);
  }

    Builder<String, Integer> builder = new Builder<>();
    ImmutableBiMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).build();
    ImmutableBiMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).build();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapOne.inverse(), 1, "one", 2, "two");
    assertMapEquals(mapTwo, "one", 1, "two", 2, "three", 3, "four", 4);

  public void testBuilderReuse() {
    Builder<String, Integer> builder = new Builder<>();
    ImmutableMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).buildOrThrow();
    ImmutableMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).buildOrThrow();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapTwo, "one", 1, "two", 2, "three", 3, "four", 4);
  }

    Builder<String, Integer> builder = new Builder<>();
    ImmutableBiMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).build();
    ImmutableBiMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).build();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapOne.inverse(), 1, "one", 2, "two");
    assertMapEquals(mapTwo, "one", 1, "two", 2, "three", 3, "four", 4);

  public void testBuilderReuse() {
    Builder<String, Integer> builder = new Builder<>();
    ImmutableMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).buildOrThrow();
    ImmutableMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).buildOrThrow();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapTwo, "one", 1, "two", 2, "three", 3, "four", 4);
  }

    Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();
    ImmutableSortedMap<String, Integer> mapOne = builder.put("one", 1).put("two", 2).build();
    ImmutableSortedMap<String, Integer> mapTwo = builder.put("three", 3).put("four", 4).build();

    assertMapEquals(mapOne, "one", 1, "two", 2);
    assertMapEquals(mapTwo, "four", 4, "one", 1, "three", 3, "two", 2);
  }