builder.put(key, value);
      expected.put(key, value);
    }
    ImmutableMap<Integer, String> map = builder.buildKeepingLast();
    assertThat(map).hasSize(500);
    assertThat(map).containsExactlyEntriesIn(expected).inOrder();
  }

  // This method tests the int case.
  public void testBuildKeepingLast_bigTable() {
    Builder<Integer, String> builder = ImmutableMap.builder();

    for (int i = 0; i < alternatingKeysAndValues.length; i += 2) {
      expected.put(alternatingKeysAndValues[i], alternatingKeysAndValues[i + 1]);
    }
    assertThat(map).containsExactlyEntriesIn(expected).inOrder();
  }

  /** No-op test so that the class has at least one method, making Maven's test runner happy. */
  public void testNoop() {}

    for (int i = 0; i < alternatingKeysAndValues.length; i += 2) {
      expected.put(alternatingKeysAndValues[i], alternatingKeysAndValues[i + 1]);
    }
    assertThat(map).containsExactlyEntriesIn(expected).inOrder();
  }

  private static class IntHolder implements Serializable {
    private int value;

    IntHolder(int value) {
      this.value = value;
    }

    @Override