Add shutdown of Netty to driver server and unit test code

pom.xml

@@ -5,7 +5,7 @@
 
   <groupId>com.nordstrom.ui-tools</groupId>
   <artifactId>htmlunit-remote</artifactId>
-  <version>4.29.1-SNAPSHOT</version>
+  <version>4.30.1-SNAPSHOT</version>
 
   <name>htmlunit-remote</name>
   <description>This is the remote wrapper for HtmlUnitDriver</description>
@@ -34,6 +34,7 @@
     <maven.compiler.target>11</maven.compiler.target>
     <selenium.version>4.30.0</selenium.version>
     <htmlunit.version>4.30.0</htmlunit.version>
+    <junit.version>4.13.2</junit.version>
     <checkstyle.version>10.15.0</checkstyle.version>
     <spotbugs.version>4.8.4</spotbugs.version>
     <dependencycheck.version>9.1.0</dependencycheck.version>
@@ -91,7 +92,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.2</version>
+      <version>${junit.version}</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

src/main/java/org/openqa/selenium/htmlunit/remote/HtmlUnitDriverServer.java

@@ -82,7 +82,7 @@ public class HtmlUnitDriverServer extends NettyServer {
      * @param options {@link BaseServerOptions} object
      */
     public HtmlUnitDriverServer(BaseServerOptions options) {
-        super(options, createHandlers().httpHandler);
+        super(options, HANDLERS.httpHandler);
     }
 
     private static final Type MAP_OF_LONGS = new TypeToken<Map<String, Long>>() {}.getType();
@@ -92,10 +92,20 @@ public HtmlUnitDriverServer(BaseServerOptions options) {
     private static final Type MAP_OF_ACTIONS = new TypeToken<Map<String, ActionsCoercer>>() {}.getType();
     private static final Type MAP_OF_COOKIES = new TypeToken<Map<String, CookieCoercer>>() {}.getType();
 
+    private static final Handlers HANDLERS = createHandlers();
     private static final Logger LOG = Logger.getLogger(HtmlUnitDriverServer.class.getName());
-
     private static Map<String, HtmlUnitDriver> driverMap = new ConcurrentHashMap<>();
 
+    static {
+        Runtime.getRuntime().addShutdownHook(new Thread() {
+            @Override
+            public void run() {
+                HANDLERS.close();
+                LOG.info("HtmlUnitDriverServer handlers have closed");
+            }
+        });
+    }
+
     /**
      * Define the handlers for the routes supported by this server.
      * 
@@ -386,7 +396,6 @@ public HttpResponse execute(final HttpRequest req) throws UncheckedIOException {
                 public HttpResponse execute(final HttpRequest req) throws UncheckedIOException {
                     return releaseActions(sessionIdFrom(params));
                 }
-
             }),
             post("/session/{sessionId}/alert/dismiss").to(params -> new HttpHandler() {
                 @Override
@@ -422,7 +431,7 @@ public HttpResponse execute(final HttpRequest req) throws UncheckedIOException {
         ) {
             @Override
             public void close() {
-                // TODO: Add implementation
+                // nothing to do here
             }
         };
     }

src/test/java/org/openqa/selenium/htmlunit/WebDriverTestCase.java

@@ -59,19 +59,23 @@ public abstract class WebDriverTestCase extends WebTestCase {
     private static final Executor EXECUTOR_POOL = Executors.newFixedThreadPool(4);
 
     private static class ServerHolder {
-        private static final Server<?> INSTANCE;
+        private static final Handlers HANDLERS = createHandlers();
+        private static final Server<?> INSTANCE = new NettyServer(defaultOptions(), HANDLERS.httpHandler);
 
         static {
-            INSTANCE = new NettyServer(defaultOptions(), createHandlers().httpHandler);
             INSTANCE.start();
 
             Runtime.getRuntime().addShutdownHook(
                     new Thread() {
                         @Override
                         public void run() {
                             INSTANCE.stop();
+                            HANDLERS.close();
+                            LOG.info("Example site web server has stopped");
                         }
                     });
+
+            LOG.info("Example site web server has started");
         }
 
         private static Handlers createHandlers() {