Add Testcase for ee8/ee9 nested HandlerCollection

jetty-ee9/jetty-ee9-servlet/src/test/java/org/eclipse/jetty/ee9/servlet/HandlerCollectionTest.java

@@ -0,0 +1,83 @@
+package org.eclipse.jetty.ee9.servlet;
+
+import java.io.IOException;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.eclipse.jetty.ee9.nested.ContextHandler;
+import org.eclipse.jetty.ee9.nested.HandlerCollection;
+import org.eclipse.jetty.http.HttpTester;
+import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.LocalConnector;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.handler.ContextHandlerCollection;
+import org.eclipse.jetty.util.component.LifeCycle;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.is;
+
+public class HandlerCollectionTest
+{
+    private Server server;
+    private LocalConnector localConnector;
+
+    @AfterEach
+    public void stopServer()
+    {
+        LifeCycle.stop(server);
+    }
+
+    private void startServer(Handler coreHandler) throws Exception
+    {
+        server = new Server();
+        localConnector = new LocalConnector(server);
+        server.addConnector(localConnector);
+        server.setHandler(coreHandler);
+        server.start();
+    }
+
+    @Test
+    public void testHandlerCollection() throws Exception
+    {
+        // ee9 specific nested HandlerCollection
+        HandlerCollection ee9HandlerCollection = new HandlerCollection();
+        ServletContextHandler ee9ContextHandler = new ServletContextHandler();
+        ee9ContextHandler.setContextPath("/test");
+
+        ServletHolder ee9ServletHolder = new ServletHolder(new HttpServlet()
+        {
+            @Override
+            protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
+            {
+                resp.setCharacterEncoding("utf-8");
+                resp.setContentType("text/plain");
+                resp.getWriter().println("Got GET Request");
+            }
+        });
+        ee9ContextHandler.addServlet(ee9ServletHolder, "/info");
+
+        ee9HandlerCollection.addHandler(ee9ContextHandler);
+        ContextHandler ee9RootContext = new ContextHandler("/", ee9HandlerCollection);
+
+        // Core ContextHandlerCollection
+        ContextHandlerCollection coreContextHandlerCollection = new ContextHandlerCollection();
+        coreContextHandlerCollection.addHandler(ee9RootContext);
+
+        startServer(coreContextHandlerCollection);
+
+        String rawRequest = """
+            GET /test/info HTTP/1.1
+            Host: local
+            Connection: close
+            
+            """;
+        HttpTester.Response response = HttpTester.parseResponse(localConnector.getResponse(rawRequest));
+        assertThat("status", response.getStatus(), is(200));
+        assertThat("response content", response.getContent(), containsString("Got GET Request"));
+    }
+}