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.bidi.browsingcontext;
  
  import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
  import static org.openqa.selenium.testing.Safely.safelyCall;
  
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.WindowType;
  import org.openqa.selenium.bidi.BrowsingContextInspector;
  import org.openqa.selenium.environment.webserver.AppServer;
  import org.openqa.selenium.environment.webserver.NettyAppServer;
  import org.openqa.selenium.firefox.FirefoxDriver;
  import org.openqa.selenium.firefox.FirefoxOptions;
  import org.openqa.selenium.testing.drivers.Browser;
  
  class BrowsingContextInspectorTest {
  
    private AppServer server;
    private FirefoxDriver driver;
  
    @BeforeEach
    public void setUp() {
      FirefoxOptions options = (FirefoxOptions) Browser.FIREFOX.getCapabilities();
      options.setCapability("webSocketUrl", true);
  
      driver = new FirefoxDriver(options);
  
      server = new NettyAppServer();
      server.start();
    }
  
    @Test
    void canListenToWindowBrowsingContextCreatedEvent()
        throws ExecutionException, InterruptedException, TimeoutException {
      try (BrowsingContextInspector inspector = new BrowsingContextInspector(driver)) {
        CompletableFuture<BrowsingContextInfo> future = new CompletableFuture<>();
  
        inspector.onBrowsingContextCreated(future::complete);
  
        String windowHandle = driver.switchTo().newWindow(WindowType.WINDOW).getWindowHandle();
  
        BrowsingContextInfo browsingContextInfo = future.get(5, TimeUnit.SECONDS);
  
        assertThat(browsingContextInfo.getId()).isEqualTo(windowHandle);
        assertThat("about:blank").isEqualTo(browsingContextInfo.getUrl());
        assertThat(browsingContextInfo.getId()).isEqualTo(windowHandle);
        assertThat(browsingContextInfo.getChildren()).isEqualTo(null);
        assertThat(browsingContextInfo.getParentBrowsingContext()).isEqualTo(null);
      }
    }
  
    @Test
    void canListenToTabBrowsingContextCreatedEvent()
        throws ExecutionException, InterruptedException, TimeoutException {
      try (BrowsingContextInspector inspector = new BrowsingContextInspector(driver)) {
        CompletableFuture<BrowsingContextInfo> future = new CompletableFuture<>();
        inspector.onBrowsingContextCreated(future::complete);
  
        String windowHandle = driver.switchTo().newWindow(WindowType.TAB).getWindowHandle();
  
        BrowsingContextInfo browsingContextInfo = future.get(5, TimeUnit.SECONDS);
  
        assertThat(browsingContextInfo.getId()).isEqualTo(windowHandle);
        assertThat("about:blank").isEqualTo(browsingContextInfo.getUrl());
        assertThat(browsingContextInfo.getId()).isEqualTo(windowHandle);
        assertThat(browsingContextInfo.getChildren()).isEqualTo(null);
        assertThat(browsingContextInfo.getParentBrowsingContext()).isEqualTo(null);
      }
    }
  
    @Test
    void canListenToDomContentLoadedEvent()
        throws ExecutionException, InterruptedException, TimeoutException {
      try (BrowsingContextInspector inspector = new BrowsingContextInspector(driver)) {
        CompletableFuture<NavigationInfo> future = new CompletableFuture<>();
        inspector.onDomContentLoaded(future::complete);
  
        BrowsingContext context = new BrowsingContext(driver, driver.getWindowHandle());
        context.navigate(server.whereIs("/bidi/logEntryAdded.html"), ReadinessState.COMPLETE);
  
        NavigationInfo navigationInfo = future.get(5, TimeUnit.SECONDS);
        assertThat(navigationInfo.getBrowsingContextId()).isEqualTo(context.getId());
        assertThat(navigationInfo.getUrl()).contains("/bidi/logEntryAdded.html");
      }
    }
  
    @Test
    void canListenToBrowsingContextLoadedEvent()
        throws ExecutionException, InterruptedException, TimeoutException {
      try (BrowsingContextInspector inspector = new BrowsingContextInspector(driver)) {
        CompletableFuture<NavigationInfo> future = new CompletableFuture<>();
        inspector.onBrowsingContextLoaded(future::complete);
  
        BrowsingContext context = new BrowsingContext(driver, driver.getWindowHandle());
        context.navigate(server.whereIs("/bidi/logEntryAdded.html"), ReadinessState.COMPLETE);
  
        NavigationInfo navigationInfo = future.get(5, TimeUnit.SECONDS);
        assertThat(navigationInfo.getBrowsingContextId()).isEqualTo(context.getId());
        assertThat(navigationInfo.getUrl()).contains("/bidi/logEntryAdded.html");
      }
    }
  
    @AfterEach
    public void quitDriver() {
      if (driver != null) {
        driver.quit();
      }
      safelyCall(server::stop);
    }
  }
  