BufferedReader r = Files.newReader(asciiFile, US_ASCII);
    try {
      assertThat(r.readLine()).isEqualTo(ASCII);
    } finally {
      r.close();
    }
  }

  public void testNewWriter() throws IOException {
    File temp = createTempFile();
    assertThrows(NullPointerException.class, () -> Files.newWriter(temp, null));

    assertThrows(NullPointerException.class, () -> Files.newWriter(null, UTF_8));