Add abstractions that let embedders drive tests of WebContents.

content/test/web_contents_tester.h

Index: content/test/web_contents_tester.h
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+// 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.
+
+#ifndef CONTENT_TEST_WEB_CONTENTS_TESTER_H_
+#define CONTENT_TEST_WEB_CONTENTS_TESTER_H_
+#pragma once
+
+#include "content/public/common/page_transition_types.h"
+
+class GURL;
+struct WebPreferences;
+
+namespace content {
+
+class BrowserContext;
+struct Referrer;
+class RenderViewHost;
+class SiteInstance;
+class WebContents;
+
+// This interface allows embedders of content/ to write tests that
+// depend on a test version of WebContents.  This interface can be
+// retrieved from any content::WebContents that was retrieved via a
+// call to RenderViewHostTestHarness::GetWebContents() (directly or
+// indirectly) or constructed explicitly via one of the
+// WebContentsTester::Create...  methods.
+//
+// Tests within content/ can directly static_cast WebContents objects
+// retrieved or created as described above to
+// content::TestWebContents.
+//
+// Design note: We considered two alternatives to this separate test
+// interface approach:
+//
+// a) Define a TestWebContents interface that inherits fromn
+// WebContents, and have the concrete TestWebContents inherit from it
+// as well as from content::WebContentsImpl.  This approach was
+// discarded as it introduces a diamond inheritance pattern, which
+// means we wouldn't be e.g. able to downcast from WebContents to
+// WebContentsImpl using static_cast.
+//
+// b) Define a TestWebContents interface that inherits from
+// WebContents, and have the concrete TestWebContents implement it,
+// using composition of a content::WebContentsImpl to implement most
+// methods.  This approach was discarded as there is a fundamental
+// assumption in content/ that a WebContents* can be downcast to a
+// WebContentsImpl*, and this wouldn't be true for TestWebContents
+// objects.
+class WebContentsTester {
+ public:
+  // Retrieves a WebContentsTester to drive tests of the specified
+  // WebContents.  As noted above you need to be sure the 'contents'
+  // object supports testing, i.e. is either created using one of the
+  // Create... functions below, or is retrieved via
+  // RenderViewHostTestHarness::GetWebContents().
+  static WebContentsTester* For(WebContents* contents);
+
+  // Creates a WebContents enabled for testing.
+  static WebContents* CreateTestWebContents(
+      BrowserContext* browser_context,
+      SiteInstance* instance);
+
+  // Deprecated.  Creates a WebContents enabled for testing, that
+  // counts the number of times SetFocusToLocationBar is called.
+  static WebContents*
+      CreateTestWebContentsCountSetFocusToLocationBar(
+          BrowserContext* browser_context,
+          SiteInstance* instance);
+
+  // Deprecated.  Creates a WebContents enabled for testing, that
+  // counts the number of times Focus is called.
+  static WebContents* CreateTestWebContentsCountFocus(
+      BrowserContext* browser_context,
+      SiteInstance* instance);
+
+  // Simulates the appropriate RenderView (pending if any, current otherwise)
+  // sending a navigate notification for the NavigationController pending entry.
+  virtual void CommitPendingNavigation() = 0;
+
+  // Only implementations retrieved via the deprecated
+  // CreateTestWebContentsFor... methods above will implement this
+  // method.  It retrieves the number of times the focus-related calls
+  // in question have been made.
+  virtual int GetNumberOfFocusCalls() = 0;
+
+  // TODO(joi): Rename this and other hacker_style virtual methods.
+  virtual content::RenderViewHost* pending_rvh() const = 0;
+
+  // Creates a pending navigation to the given URL with the default parameters
+  // and then commits the load with a page ID one larger than any seen. This
+  // emulates what happens on a new navigation.
+  virtual void NavigateAndCommit(const GURL& url) = 0;
+
+  // Simulates the current RVH notifying that it has unloaded so that the
+  // pending RVH navigation can proceed.
+  // Does nothing if no cross-navigation is pending.
+  virtual void ProceedWithCrossSiteNavigation() = 0;
+
+  virtual void TestDidNavigate(content::RenderViewHost* render_view_host,
+                               int page_id,
+                               const GURL& url,
+                               content::PageTransition transition) = 0;
+
+  virtual void TestDidNavigateWithReferrer(
+      content::RenderViewHost* render_view_host,
+      int page_id,
+      const GURL& url,
+      const content::Referrer& referrer,
+      content::PageTransition transition) = 0;
+
+  // Promote GetWebkitPrefs to public.
+  virtual WebPreferences TestGetWebkitPrefs() = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_WEB_CONTENTS_TESTER_H_