chore: migrate Trace Viewer tests to use real Trace viewer

Author: mxschmitt

playwright/src/test/java/com/microsoft/playwright/Server.java

@@ -20,6 +20,7 @@
 
 import java.io.*;
 import java.net.InetSocketAddress;
+import java.nio.file.Path;
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Future;
@@ -40,6 +41,7 @@ public class Server implements HttpHandler {
   private final Map<String, String> csp = Collections.synchronizedMap(new HashMap<>());
   private final Map<String, HttpHandler> routes = Collections.synchronizedMap(new HashMap<>());
   private final Set<String> gzipRoutes = Collections.synchronizedSet(new HashSet<>());
+  private java.nio.file.Path staticFilesDirectory;
 
   private static class Auth {
     public final String user;
@@ -93,6 +95,10 @@ void enableGzip(String path) {
     gzipRoutes.add(path);
   }
 
+  void setStaticFilesDirectory(Path staticFilesDirectory) {
+    this.staticFilesDirectory = staticFilesDirectory;
+  }
+
   static class Request {
     public final String url;
     public final String method;
@@ -187,7 +193,19 @@ public void handle(HttpExchange exchange) throws IOException {
       path = "/index.html";
     }
 
-    // Resources from "src/test/resources/" are copied to "resources/" directory in the jar.
+    // If static files directory is set, serve from filesystem first
+    if (staticFilesDirectory != null) {
+      java.nio.file.Path filePath = staticFilesDirectory.resolve(path.substring(1)); // Remove leading /
+      if (java.nio.file.Files.exists(filePath) && !java.nio.file.Files.isDirectory(filePath)) {
+        exchange.getResponseHeaders().add("Content-Type", mimeType(filePath.toFile()));
+        exchange.sendResponseHeaders(200, java.nio.file.Files.size(filePath));
+        java.nio.file.Files.copy(filePath, exchange.getResponseBody());
+        exchange.getResponseBody().close();
+        return;
+      }
+    }
+
+    // Fallback: Resources from "src/test/resources/" are copied to "resources/" directory in the jar.
     String resourcePath = "resources" + path;
     InputStream resource = getClass().getClassLoader().getResourceAsStream(resourcePath);
     if (resource == null) {