accessTokenHelper.setRandom(new Random(12345L));
        final String token2 = accessTokenHelper.generateAccessToken();

        assertEquals(token1, token2);
    }

    public void test_generateAccessToken_withCustomRandom() {
        final Random customRandom = new Random(0L);
        accessTokenHelper.setRandom(customRandom);

        final String token = accessTokenHelper.generateAccessToken();