Add a timemachine tool script

- Wrapper around faketime
- Provides an interface to run tests at specific points in time

test/timemachine

@@ -0,0 +1,46 @@
#!/bin/bash

# parse options/arguments
until [[ -z "${1}" ]] ; do
  case "${1}" in
    --minute)
      shift
      minutes="${minutes} ${1}"
      ;;
    --hour)
      shift
      hours="${hours} ${1}"
      ;;
    --day)
      shift
      days="${days} ${1}"
      ;;
    --fail-at-end)
      fail_at_end=1
      ;;
    -*)
      echo "Unknown option '${1}'"
      exit 1
      ;;
    *)
      tests="${tests} ${1}"
      ;;
  esac
  shift
done

for day in ${days-$(date --rfc-3339=date)} ; do
  for minute in ${minutes-$(echo "0$(rand -M 60)" | sed "s|.\+\(..\)\$|\1|g")} ; do
    for hour in ${hours-$(seq -w 0 23)} ; do
      date="${day}T${hour}:${minute}"
      for single_test in ${tests} ; do
        echo "Running test ${single_test} at ${date}"
        faketime "@${date}" "${single_test}"
        if [[ $? -ne 0 ]] ; then
          echo "Test ${single_test} broke at ${date}!"
          [[ ${fail_at_end-0} -ne 0 ]] || break 2
        fi
      done
    done
  done
done