@Override
            public void configureWebSocketClient(WebSocketClientBuilder wscb)
                    throws Exception {
                ServerExtension.this.configureWebSocketClient(wscb);
            }
Creates a new instance.

@param autoStart {@code true} if the {@link Server} should start automatically.
                 {@code false} if the {@link Server} should start when a user calls {@link #start()}.
junit5/src/main/java/com/linecorp/armeria/testing/junit5/server/ServerExtension.java