int bytesRead = stream.read(buffer, 2, 5);

        assertEquals(5, bytesRead);
        assertEquals("01234", new String(buffer, 2, 5));
    }

    public void test_available_delegatesToUnderlying() throws IOException {
        // Test that available() delegates to underlying stream
        byte[] data = "Test data".getBytes();
        InputStream underlyingStream = new ByteArrayInputStream(data);