Create base class for TabHelpers.

chrome/browser/tab_contents/web_contents_user_data_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/tab_contents/web_contents_user_data.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/test/base/chrome_render_view_host_test_harness.h"
+#include "chrome/test/base/testing_profile.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/web_contents_tester.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class WebContentsAttachedClass1
+    : public WebContentsUserData<WebContentsAttachedClass1> {
+ public:
+  explicit WebContentsAttachedClass1(content::WebContents* contents) {}
+  virtual ~WebContentsAttachedClass1() {}
+  static int kUserDataKey;
+};
+
+class WebContentsAttachedClass2
+    : public WebContentsUserData<WebContentsAttachedClass2> {
+ public:
+  explicit WebContentsAttachedClass2(content::WebContents* contents) {}
+  virtual ~WebContentsAttachedClass2() {}
+  static int kUserDataKey;
+};
+
+int WebContentsAttachedClass1::kUserDataKey;
+int WebContentsAttachedClass2::kUserDataKey;
+
+}  // namespace
+
+typedef ChromeRenderViewHostTestHarness WebContentsUserDataTest;
+
+TEST_F(WebContentsUserDataTest, OneInstanceTwoAttachments) {
+  content::WebContents* contents = web_contents();
+  WebContentsAttachedClass1* class1 =
+      WebContentsAttachedClass1::FromWebContents(contents);
+  ASSERT_EQ(NULL, class1);
+  WebContentsAttachedClass2* class2 =
+      WebContentsAttachedClass2::FromWebContents(contents);
+  ASSERT_EQ(NULL, class2);
+
+  WebContentsAttachedClass1::CreateForWebContents(contents);
+  class1 = WebContentsAttachedClass1::FromWebContents(contents);
+  ASSERT_TRUE(class1 != NULL);
+  class2 = WebContentsAttachedClass2::FromWebContents(contents);
+  ASSERT_EQ(NULL, class2);
+
+  WebContentsAttachedClass2::CreateForWebContents(contents);
+  WebContentsAttachedClass1* class1again =
+      WebContentsAttachedClass1::FromWebContents(contents);
+  ASSERT_TRUE(class1again != NULL);
+  class2 = WebContentsAttachedClass2::FromWebContents(contents);
+  ASSERT_TRUE(class2 != NULL);
+  ASSERT_EQ(class1, class1again);
+  ASSERT_NE(static_cast<void*>(class1), static_cast<void*>(class2));
+}
+
+TEST_F(WebContentsUserDataTest, TwoInstancesOneAttachment) {
+  content::WebContents* contents1 = web_contents();
+  scoped_ptr<content::WebContents> contents2(
+      content::WebContentsTester::CreateTestWebContents(profile(), NULL));
+
+  WebContentsAttachedClass1* one_class =
+      WebContentsAttachedClass1::FromWebContents(contents1);
+  ASSERT_EQ(NULL, one_class);
+  WebContentsAttachedClass1* two_class =
+      WebContentsAttachedClass1::FromWebContents(contents2.get());
+  ASSERT_EQ(NULL, two_class);
+
+  WebContentsAttachedClass1::CreateForWebContents(contents1);
+  one_class = WebContentsAttachedClass1::FromWebContents(contents1);
+  ASSERT_TRUE(one_class != NULL);
+  two_class = WebContentsAttachedClass1::FromWebContents(contents2.get());
+  ASSERT_EQ(NULL, two_class);
+
+  WebContentsAttachedClass1::CreateForWebContents(contents2.get());
+  WebContentsAttachedClass1* one_class_again =
+      WebContentsAttachedClass1::FromWebContents(contents1);
+  ASSERT_TRUE(one_class_again != NULL);
+  two_class = WebContentsAttachedClass1::FromWebContents(contents2.get());
+  ASSERT_TRUE(two_class != NULL);
+  ASSERT_EQ(one_class, one_class_again);
+  ASSERT_NE(one_class, two_class);
+}