ImmutableMap<Integer, String> map = builder.buildKeepingLast();
    assertMapEquals(map, 1, "one", 2, "two", 70, "seventy");
  }

  public void testBuildKeepingLast_smallTableSameHash() {
    String key1 = "QED";
    String key2 = "R&D";
    assertThat(key1.hashCode()).isEqualTo(key2.hashCode());
    ImmutableMap<String, Integer> map =
        ImmutableMap.<String, Integer>builder()
            .put(key1, 1)