sucessfully opened fifo

Testing empty FIFO:
	testing POLLIN|POLLOUT
		1 fd(s) ready, revents == POLLOUT
	testing POLLIN
		0 fd(s) ready
	testing POLLOUT
		1 fd(s) ready, revents == POLLOUT

Testing full FIFO:
	testing POLLIN|POLLOUT
		1 fd(s) ready, revents == POLLIN POLLOUT
	testing POLLIN
		1 fd(s) ready, revents == POLLIN
	testing POLLOUT
		1 fd(s) ready, revents == POLLOUT
	received 'test' from FIFO