org\bovigo\vfs\vfsStreamWrapperSetOptionTestCase::setWriteBufferDoesNotWork PHP Method

    public function setWriteBufferDoesNotWork()
    {
        $fp = fopen(vfsStream::url('root/foo.txt'), 'rb');
        $this->assertEquals(-1, stream_set_write_buffer($fp, 512));
        fclose($fp);
    }