code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  package org.openqa.selenium.grid.data;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.openqa.selenium.grid.data.Availability.UP;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableSet;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.time.Duration;
  import java.time.Instant;
  import java.util.UUID;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.ImmutableCapabilities;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.remote.SessionId;
  
  class NodeStatusTest {
  
    @Test
    void ensureRoundTripWorks() throws URISyntaxException {
      ImmutableCapabilities stereotype = new ImmutableCapabilities("cheese", "brie");
      NodeId nodeId = new NodeId(UUID.randomUUID());
      NodeStatus status =
          new NodeStatus(
              nodeId,
              new URI("http://localhost:23456"),
              100,
              ImmutableSet.of(
                  new Slot(
                      new SlotId(nodeId, UUID.randomUUID()),
                      stereotype,
                      Instant.EPOCH,
                      new Session(
                          new SessionId(UUID.randomUUID()),
                          new URI("http://localhost:1235"),
                          stereotype,
                          new ImmutableCapabilities("peas", "sausages"),
                          Instant.now()))),
              UP,
              Duration.ofSeconds(10),
              "4.0.0",
              ImmutableMap.of(
                  "name", "Max OS X",
                  "arch", "x86_64",
                  "version", "10.15.7"));
  
      Json json = new Json();
      String source = json.toJson(status);
  
      System.out.println(source);
  
      Object seen = json.toType(source, NodeStatus.class);
  
      assertThat(seen).isEqualTo(status);
    }
  }
  