String result2 = popularWordHelper.getCacheKey(seed, tags, roles, fields, excludes);

        assertEquals(result1, result2);
    }

    public void test_getCacheKey_differentOrder() {
        String seed = "test_seed";
        String[] tags1 = { "tag1", "tag2" };
        String[] tags2 = { "tag2", "tag1" };
        String[] roles = { "role1" };
        String[] fields = { "field1" };