Spy exit code

[RevanProdigalKnight]

Right now bashunit::spy thing essentially creates a no-op mock that always returns 0. It would be useful to be able to add an optional exit code or mock implementation, e.g.: bashunit::spy thing 1 or bashunit::spy thing mock_thing for testing different branches in a function while also being able to make assertions on the spy itself.

Larger example of what I'm trying to do:

# function being spied upon
function thing() {
  if [ "${#1}" -lt 3 ]; then
    return 0
  else
    return 1
  fi
}

# function being tested
function do_things() {
  for word in "$@"; do
    if ! thing "$word"; then
      return 0
    fi
  done

  return 1
}

# test cases
function test_do_things() {
  bashunit::spy thing

  do_things "hi" "my" "name" "is" "bob"
  # FAILS because thing spy always returns 0
  assert_exit_code 0
  # FAILS because do_things didn't return early
  assert_have_been_called_times 3 thing
}