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

        assertNotNull(result);
        assertTrue(result.contains("test_seed"));
        assertTrue(result.contains("tag1tag2"));
        assertTrue(result.contains("role1role2"));
        assertTrue(result.contains("field1field2"));
        assertTrue(result.contains("exclude1exclude2"));

        // Count separators