{
  pkgs,
  lib,
}:
pkgs.writeShellScriptBin "run_test_description" ''
  set -eu

  [ "$#" -ne 1 ] && {
    echo "Usage: $0 <Test description file>";
    exit 2
  }
  description="$(realpath "$1")"

  base="$(mktemp -d)"
  cd "$base"

  __TEST_TMUX="${lib.getExe pkgs.tmux}"
  __TEST_SHELL="${lib.getExe pkgs.dash}"
  __TEST_TMUX_PANE="__TEST_TMUX_PANE"

  __TEST_EVAL_USE_ALTERNATE_SCREEN="false"
  __TEST_EVAL_AWK_CLEAN_FILE="${./clean.awk}"
  __TEST_EVAL_LOG_FILE="__test_log"
  __TEST_EVAL_GOLDEN_FILE="$(mktemp)"
  printf "%s" "__test_golden" >"$__TEST_EVAL_GOLDEN_FILE"

  . ${./driver.sh}

  echo "Setting up a session.."
  if "$__TEST_TMUX" has-session -t "$__TEST_TMUX_PANE"; then
    echo "Killing old '$__TEST_TMUX_PANE' session."
    "$__TEST_TMUX" kill-session -t "$__TEST_TMUX_PANE"
  fi
  "$__TEST_TMUX" new-session -d -s "$__TEST_TMUX_PANE"

  echo "Initializing pipe.."
  "$__TEST_TMUX" pipe-pane -t "$__TEST_TMUX_PANE" -o 'cat >>./test.golden'

  echo "Evaluating description.."
  __test_eval "$description"

  "$__TEST_TMUX" pipe-pane -t "$__TEST_TMUX_PANE"

  echo "Base dir: $base"
''