Introduce NavigationSimulator to use in unit tests

content/test/navigation_simulator_impl.h

+// Copyright 2017 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_NAVIGATION_SIMULATOR_IMPL_H_
+#define CONTENT_TEST_NAVIGATION_SIMULATOR_IMPL_H_
+
+#include <vector>
+
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/referrer.h"
+#include "content/public/test/navigation_simulator.h"
+#include "ui/base/page_transition_types.h"
+
+namespace content {
+
+class NavigationHandleImpl;
+class TestRenderFrameHost;
+
+// See NavigationSimulator for a description of what this class does.
+class NavigationSimulatorImpl : public NavigationSimulator,

[ncarter (slow), 2017/02/28 23:27:44]

It looks like this ought to be preferred over
RenderFrameHostTester::For(rfh)->SimulateNavigationStart, etc. Should we put a
comment in the render_frame_host_tester.h saying that those methods are
deprecated?

[clamy, 2017/03/01 16:18:09]

Done.

+                                WebContentsObserver {

[ncarter (slow), 2017/02/28 23:27:44]

should be public WebContentsObserver

[clamy, 2017/03/01 16:18:09]

Done.

+ public:
+  static void NavigateAndCommitFromDocument(
+      const GURL& original_url,
+      TestRenderFrameHost* render_frame_host);
+  static void NavigateAndFailFromDocument(
+      const GURL& original_url,
+      int net_error_code,
+      TestRenderFrameHost* render_frame_host);
+
+  NavigationSimulatorImpl(const GURL& original_url,
+                          TestRenderFrameHost* render_frame_host);
+  ~NavigationSimulatorImpl() override;
+
+  // NavigationSimulator:
+  void Start() override;
+  void Redirect(const GURL& new_url) override;
+  void Commit() override;
+  void Fail(int error_code) override;
+  void CommitErrorPage() override;
+  void CommitSamePage() override;
+  void SetTransition(ui::PageTransition transition) override;
+  void SetReferrer(const Referrer& referrer) override;
+
+  // WebContentsObserver:
+  void DidStartNavigation(NavigationHandle* navigation_handle) override;
+  void DidRedirectNavigation(NavigationHandle* navigation_handle) override;
+  void ReadyToCommitNavigation(NavigationHandle* navigation_handle) override;
+  void DidFinishNavigation(NavigationHandle* navigation_handle) override;
+
+ private:
+  void OnWillStartRequest();
+  void OnWillRedirectRequest();
+  void OnWillProcessResponse();
+
+  enum State {
+    INITIALIZATION,
+    STARTED,
+    FAILED,
+    FINISHED,
+  };
+
+  State state_ = INITIALIZATION;
+
+  // The renderer associated with this navigation.
+  TestRenderFrameHost* render_frame_host_;
+
+  // The NavigationHandle associated with this navigation.
+  NavigationHandleImpl* handle_;
+
+  GURL navigation_url_;
+  Referrer referrer_;
+  ui::PageTransition transition_ = ui::PAGE_TRANSITION_LINK;
+
+  // These are used to sanity check the content/public/ API calls emitted as
+  // part of the navigation.
+  int num_did_start_navigation_called_ = 0;
+  int num_will_start_request_called_ = 0;
+  int num_will_redirect_request_called_ = 0;
+  int num_did_redirect_navigation_called_ = 0;
+  int num_will_process_response_called_ = 0;
+  int num_ready_to_commit_called_ = 0;
+  int num_did_finish_navigation_called_ = 0;
+
+  base::WeakPtrFactory<NavigationSimulatorImpl> weak_factory_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_NAVIGATION_SIMULATOR_IMPL_H_