public function testOverwrite()
{
$s = new Stream();
$s->open(STREAM_MODE_READWRITE);
$s->writeLine('Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Curabitur aliquam.');
$s->seek(20);
$s->writeLine('Lorem ipsum dolor sit amet.');
$this->assertEquals($s->buffer, "Lorem ipsum dolor siLorem ipsum dolor sit amet.\ning elit. Curabitur aliquam.\n");
}
