@Test
    void tlsCustomizationWithTlsSelfSigned() {
        tlsCustomization(ServerBuilder::tlsSelfSigned, VirtualHostBuilder::tlsSelfSigned);
    }
Makes sure that {@link ServerBuilder#decorator(DecoratingHttpServiceFunction)} works at every service and
virtual hosts and {@link VirtualHostBuilder#decorator(DecoratingHttpServiceFunction)} works only at
its own services.
core/src/test/java/com/linecorp/armeria/server/ServerBuilderTest.java