def test_pipe():
from popysh.syscmd import cat, grep, tr
out = cat(input="bla\nbli\nblo").pipe(grep("bl[ai]")).pipe(tr("b", "c")).as_bytes()
eq_(out, "cla\ncli\n")
def test_as_lines():
from popysh.syscmd import cat
lines = cat(input="bla\nbli").as_lines()
eq_(lines, ["bla", "bli"])