def test_check_in_a_guest():
hotel = Hotel()
hotel.check_in('Bob Barker', 302)
assert(('Bob Barker' in hotel.guests()) == True)
def test_check_out_a_guest():
hotel = Hotel()
hotel.check_in('Bob Dylan', 306)
hotel.check_out('Bob Dylan')
assert(('Bob Dylan' in hotel.guests()) == False)