assertDoesNotThrow(() -> concreteImplementation.fixupHost(fqdn));
        }

        @Test
        @DisplayName("Should fixup domain")
        void testFixupDomain() {
            String domain = "example.com";

            // Test with mock
            doNothing().when(mockReferralData).fixupDomain(domain);
            mockReferralData.fixupDomain(domain);