IllegalStateException ex =
        assertThrows(IllegalStateException.class, () -> in.readFully(actual));
    assertThat(ex).hasCauseThat().isInstanceOf(EOFException.class);
  }

  public void testNewDataInput_readFullyWithOffset() {
    ByteArrayDataInput in = ByteStreams.newDataInput(bytes);
    byte[] actual = new byte[4];
    in.readFully(actual, 2, 2);
    assertEquals(0, actual[0]);
    assertEquals(0, actual[1]);