assertThrows(ClassCastException.class, () -> {
                referralData.unwrap(IncompatibleReferralData.class);
            });
        }
    }

    @Nested
    @DisplayName("Property Getter and Setter Tests")
    class PropertyTests {

        @Test
        @DisplayName("Should get and set domain")
        void testDomain() {
            assertNull(referralData.getDomain());

            assertEquals(expectedFlags, flags);
        }
    }

    @Nested
    @DisplayName("Getter and Setter Tests")
    class GetterSetterTests {

        @Test
        @DisplayName("setChallenge and getChallenge should work correctly")
        void testGetSetChallenge() {
            // Given