}

    @Nested
    @DisplayName("Interface Method Contract Tests")
    class InterfaceMethodTests {

        @Test
        @DisplayName("Should fixup host with FQDN")
        void testFixupHost() {
            String fqdn = "server.example.com";

            // Test with mock
            doNothing().when(mockReferralData).fixupHost(fqdn);
            mockReferralData.fixupHost(fqdn);