PlzNavigate: Refactor unit test helper functions

content/test/browser_side_navigation_test_utils.h

+// Copyright 2014 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_BROWSER_SIDE_NAVIGATION_TEST_UTILS_H_
+#define CONTENT_TEST_BROWSER_SIDE_NAVIGATION_TEST_UTILS_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace content {
+
+class StreamHandle;
+class StreamRegistry;
+class TestNavigationURLLoaderFactory;
+
+// PlzNavigate
+// A UI thread singleton helper class for browser side navigations. When browser
+// side navigations are enabled, initialize this class before doing any
+// operation that may start a navigation request on the UI thread. Use TearDown
+// at the end of the test.
+class BrowserSideNavigationTestUtils {
+ public:
+  // Initializes the BrowserSideNavigationsTestUtils. Following this call, all
+  // NavigationURLLoader objects created will be TestNavigationURLLoaders
+  // instead of NavigationURLloaderImpls. This should be called before any call
+  // in the UI thread unit tests that will start a navigation (eg.
+  // TestWebContents::NavigateAndCommit).
+  static void SetUp();
+
+  // Destroys the BrowserSideNavigationTestUtils singleton.
+  static void TearDown();
+
+  // Returns an empty stream. Used when faking a navigation commit notification
+  // from the IO thread with a TestNavigationURLLoader.
+  static scoped_ptr<StreamHandle> MakeEmptyStream();

[nasko, 2014/11/17 22:40:02]

A class full of static methods is equivalent to a bunch of methods in a
namespace. This is what other utils files do, so I wonder which one is a better
approach.

[clamy, 2014/11/18 12:33:22]

When writing the web_url_request_util, jam@ specifically commented on this
subject that we do not use nested namespaces inside content. So unless I have
another namespace outside of content (which looks a bit weird IMO), I can't
bundle them in a namespace. I have uploaded a new version with more specific
functions names not in a class. Do you like it better?

+
+  static void EnableBrowserSideNavigation();
+
+  ~BrowserSideNavigationTestUtils();
+
+ private:
+  BrowserSideNavigationTestUtils();
+
+  scoped_ptr<StreamRegistry> stream_registry_;
+  scoped_ptr<TestNavigationURLLoaderFactory> loader_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserSideNavigationTestUtils);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_BROWSER_SIDE_NAVIGATION_TEST_UTILS_H_