assertThrows(IndexOutOfBoundsException.class, () -> checkPositionIndex(-1, 1));
    assertThat(expected).hasMessageThat().isEqualTo("index (-1) must not be negative");
  }

  public void testCheckPositionIndex_tooHigh() {
    IndexOutOfBoundsException expected =
        assertThrows(IndexOutOfBoundsException.class, () -> checkPositionIndex(2, 1));