@Test public void testCopyLargeBuffer() throws IOException { final byte[] buf = new byte[1024]; final byte[] expected = new byte[10000]; final long seed = System.currentTimeMillis(); final Random rng = new Random(seed); rng.nextBytes(expected); final ByteArrayInputStream in = new ByteArrayInputStream(expected); final ByteArrayOutputStream out = new ByteArrayOutputStream(); final long count = IOUtils.copyLarge(in, out, buf); assertEquals("seed == " + seed, expected.length, count); assertArrayEquals("seed == " + seed, expected, out.toByteArray()); }