public function canNotWriteToReadOnlyFile()
{
$fp = fopen($this->baz2URL, 'rb');
$this->assertEquals('baz2', fread($fp, 4096));
$this->assertEquals(0, fwrite($fp, 'foo'));
fclose($fp);
$this->assertEquals('baz2', file_get_contents($this->baz2URL));
}