}

  private static <T> Map<T, T> map(T... keysAndValues) {
    assertThat(keysAndValues.length % 2).isEqualTo(0);
    LinkedHashMap<T, T> map = new LinkedHashMap<>();
    for (int i = 0; i < keysAndValues.length; i += 2) {
      T key = keysAndValues[i];
      T value = keysAndValues[i + 1];
      T old = map.put(key, value);