public Endpoint endpoint(SessionProtocol protocol) {
        return delegate.endpoint(protocol);
    }
Returns the {@link Endpoint} of the specified {@link SessionProtocol} for the {@link Server}.

@throws IllegalStateException if the {@link Server} is not started or
                              it did not open the port for the specified {@link SessionProtocol}.
junit5/src/main/java/com/linecorp/armeria/testing/junit5/server/ServerExtension.java