Train Driver: Force rest parameter on first test

[SleeplessByte]

toStrictEqual prevents CLI submissions of

export function getListOfWagons(a, b, c, d, e, f, g, h, i, j, k, l, m, n) {
  return [a, b, c, d, e, f, g, h, i, j, k, l, m, n]
}

This is important because we want the teaching goal of ...ids as function parameter.