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{ runCommand, nix, expect }:

# We only use expect when necessary, e.g. for testing tab completion in nix repl.
# See also tests/functional/repl.sh

runCommand "repl-completion" {
  nativeBuildInputs = [
    expect
    nix
  ];
  expectScript = ''
    # Regression https://github.com/NixOS/nix/pull/10778
    spawn nix repl --offline --extra-experimental-features nix-command
    expect "nix-repl>"
    send "foo = import ./does-not-exist.nix\n"
    expect "nix-repl>"
    send "foo.\t"
    expect {
      "nix-repl>" {
        puts "Got another prompt. Good."
      }
      eof {
        puts "Got EOF. Bad."
        exit 1
      }
    }
    exit 0
  '';
  passAsFile = [ "expectScript" ];
}
''
  export NIX_STORE=$TMPDIR/store
  export NIX_STATE_DIR=$TMPDIR/state
  export HOME=$TMPDIR/home
  mkdir $HOME

  nix-store --init
  expect $expectScriptPath
  touch $out
''