Card PAN generating (random numbers)

cardsgenerate.java

 public long givenUsingPlainJava_whenGeneratingRandomLongBounded_thenCorrect() {
    long leftLimit = 10000000000L;
    long rightLimit = 1000L;
    long generatedLong = leftLimit + (long) (Math.random() * (rightLimit - leftLimit));
    return generatedLong;
}

    public long generateRandomCard() {
        long card = this.givenUsingPlainJava_whenGeneratingRandomLongBounded_thenCorrect();
        return card;
    }