}
    byte[] actual = out.toByteArray();
    for (int i = 0; i < 500 * chunkSize; i += chunkSize) {
      assertThat(Arrays.copyOfRange(actual, i, i + chunkSize)).isEqualTo(dummyData);
    }
  }

  public void testReadFully() throws IOException {
    byte[] b = new byte[10];

    assertThrows(
        NullPointerException.class, () -> ByteStreams.readFully(newTestStream(10), null, 0, 10));

    }
    byte[] actual = out.toByteArray();
    for (int i = 0; i < 500 * chunkSize; i += chunkSize) {
      assertThat(Arrays.copyOfRange(actual, i, i + chunkSize)).isEqualTo(dummyData);
    }
  }

  public void testReadFully() throws IOException {
    byte[] b = new byte[10];

    assertThrows(
        NullPointerException.class, () -> ByteStreams.readFully(newTestStream(10), null, 0, 10));