@Test
    void duplicatedPort() {
        // Known to fail on WSL (Windows Subsystem for Linux)
        assumeThat(System.getenv("WSLENV")).isNull();

        final Server duplicatedPortServer = Server.builder()
                                                  .http(server.httpPort())
                                                  .service("/", (ctx, res) -> HttpResponse.of(""))
                                                  .build();
        assertThatThrownBy(() -> duplicatedPortServer.start().join())
                .hasCauseInstanceOf(IOException.class);
    }
Ensure that the connection is not broken even if {@link Service#serve(ServiceRequestContext, Request)}
raises an exception.
core/src/test/java/com/linecorp/armeria/server/ServerTest.java