assertEquals(link, referralData.getLink());
        }

        @ParameterizedTest
        @NullAndEmptySource
        @DisplayName("Should handle null and empty keys")
        void testNullAndEmptyKeys(String key) {
            referralData.setKey(key);
            assertEquals(key, referralData.getKey());
        }

        @Test
        @DisplayName("Should handle very long paths")