def expect_next from p (str):
    expect /(.*)/ from p capture line
    guard (line == str)

test Test:
    node n
    shell on n as p:
        cat

    send "a" to p
    send "b" to p
    send "x" to p
    expect /x/ from p

    ignore from p matching /a/
    send "a" to p
    send "c" to p

    expect_next "b" from p
    expect_next "c" from p

    send "a" to p
    send "b" to p
    with p:
        send "c"
        ignore matching /[bcd]/
        send "d"
        send "e"
        expect_next "e" from p

    send "a" to p
    send "b" to p
    local:
        send "c" to p
        send "d" to p

        expect_next "b" from p
        expect_next "c" from p
        expect_next "d" from p