@ParameterizedTest
    @CsvSource({ "pkcs5.pem", "pkcs8.pem" })
    void tlsPkcsPrivateKeysWithCustomizer(String privateKeyFileName) {
        Server.builder()
              .tlsSelfSigned()
              .tlsCustomizer(sslCtxBuilder -> {
                  sslCtxBuilder.keyManager(
                          getClass().getResourceAsStream(RESOURCE_PATH_PREFIX + "cert.pem"),
                          getClass().getResourceAsStream(RESOURCE_PATH_PREFIX + privateKeyFileName));
              })
              .service("/", (ctx, req) -> HttpResponse.of(200))
              .build();
    }
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