fix: correctly initialize page.isClosed() (#163)

Author: yury-s

playwright/src/main/java/com/microsoft/playwright/impl/PageImpl.java

@@ -55,6 +55,7 @@ public class PageImpl extends ChannelOwner implements Page {
     browserContext = (BrowserContextImpl) parent;
     mainFrame = connection.getExistingObject(initializer.getAsJsonObject("mainFrame").get("guid").getAsString());
     mainFrame.page = this;
+    isClosed = initializer.get("isClosed").getAsBoolean();
     keyboard = new KeyboardImpl(this);
     mouse = new MouseImpl(this);
     touchscreen = new TouchscreenImpl(this);
@@ -212,6 +213,9 @@ public void removeListener(EventType type, Listener<EventType> listener) {
 
   @Override
   public void close(CloseOptions options) {
+    if (isClosed) {
+      return;
+    }
     JsonObject params = options == null ? new JsonObject() : gson().toJsonTree(options).getAsJsonObject();
     try {
       sendMessage("close", params);

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

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed 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 com.microsoft.playwright;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.OutputStreamWriter;
+
+import static com.microsoft.playwright.BrowserContext.EventType.PAGE;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class TestBrowserContextBasic extends TestBase {
+  @Test
+  void shouldNotReportFramelessPagesOnError() {
+    BrowserContext context = browser.newContext();
+    Page page = context.newPage();
+    server.setRoute("/empty.html", exchange -> {
+      exchange.sendResponseHeaders(200, 0);
+      try (OutputStreamWriter writer = new OutputStreamWriter(exchange.getResponseBody())) {
+        writer.write("<a href='" + server.EMPTY_PAGE + "' target='_blank'>Click me</a>");
+      }
+    });
+    Page[] popup = {null};
+    context.addListener(PAGE, event -> popup[0] = (Page) event.data());
+    page.navigate(server.EMPTY_PAGE);
+    page.click("'Click me'");
+    context.close();
+    if (popup[0] != null) {
+      // This races on Firefox :/
+      assertTrue(popup[0].isClosed());
+      assertNotNull(popup[0].mainFrame());
+    }
+  }
+}