def test_arbitrary_line_split():
text = "100 100\n200 200\n300 300\n"
expected = ['100 100', '200 200', '300 300']
for i in xrange(1, len(text)):
buf = StringIO(text)
# make buf mimic a serial port object
buf.inWaiting = lambda : i
gen = arbitrary_line_split(buf, return_if_empty=True)
# See http://stackoverflow.com/a/406199/2823213
out = list(itertools.chain.from_iterable(gen))
ok_(out, expected)
