{ inko
, writeText
, runCommand
, ...
}:

let
  source = writeText "hello.inko" /* inko */ ''
    import std.process (sleep)
    import std.stdio (STDOUT)
    import std.time (Duration)

    class async Printer {
      fn async print(message: String, channel: Channel[Nil]) {
        let _ = STDOUT.new.print(message)

        channel.send(nil)
      }
    }

    class async Main {
      fn async main {
        let channel = Channel.new(size: 2)

        Printer().print('Hello', channel)
        Printer().print('world', channel)

        channel.receive
        channel.receive
      }
    }
  '';
in

runCommand "inko-test" { } ''
  ${inko}/bin/inko run ${source} > $out
  cat $out | grep -q Hello
  cat $out | grep -q world
''