@Test

    public void output() throws Exception {

        // I don't like "test all at once" tests either, but the class

        // is soo trivial

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        CountingOutputStream o = new CountingOutputStream(bos);

        o.write(1);

        assertEquals(1, o.getBytesWritten());

        o.write(new byte[] { 2, 3 });

        assertEquals(3, o.getBytesWritten());

        o.write(new byte[] { 2, 3, 4, 5, }, 2, 1);

        assertEquals(4, o.getBytesWritten());

        o.count(-1);

        assertEquals(4, o.getBytesWritten());

        o.count(-2);

        assertEquals(2, o.getBytesWritten());

        o.close();

        assertArrayEquals(new byte[] { 1, 2, 3, 4 }, bos.toByteArray());

    }

    private long bytesWritten = 0;

        super(out);

    }

        out.write(b);

        count(1);

    }

        write(b, 0, b.length);

    }

        out.write(b, off, len);

        count(len);

    }

        if (written != -1) {

            bytesWritten += written;

    }

        return bytesWritten;