assertEquals(domain, referralData.getDomain());
        }

        @ParameterizedTest
        @NullAndEmptySource
        @DisplayName("Should handle null and empty links")
        void testNullAndEmptyLinks(String link) {
            referralData.setLink(link);
            assertEquals(link, referralData.getLink());
        }

        @ParameterizedTest
        @NullAndEmptySource