assertEquals(11, counter.getCount());
    counter.reset();
    assertEquals(10, counter.getCount());
    assertEquals(10, counter.skip(100));
    assertEquals(20, counter.getCount());
  }

  public void testMarkNotSet() {
    IOException expected = assertThrows(IOException.class, () -> counter.reset());
    assertThat(expected).hasMessageThat().isEqualTo("Mark not set");
  }

  public void testMarkNotSupported() {