Add another unittest for configuring sign-in dependency.

components/ntp_snippets/remote/ntp_snippets_status_service.h

-// Copyright 2016 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 COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_STATUS_SERVICE_H_
-#define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_STATUS_SERVICE_H_
-
-#include "base/callback.h"
-#include "base/gtest_prod_util.h"
-#include "base/scoped_observer.h"
-#include "components/prefs/pref_change_registrar.h"
-
-class PrefRegistrySimple;
-class PrefService;
-class SigninManagerBase;
-
-namespace ntp_snippets {
-
-enum class SnippetsStatus : int {
-  // Snippets are enabled and the user is signed in.
-  ENABLED_AND_SIGNED_IN,
-  // Snippets are enabled and the user is signed out (sign in is not required).
-  ENABLED_AND_SIGNED_OUT,
-  // Snippets have been disabled as part of the service configuration.
-  EXPLICITLY_DISABLED,
-  // The user is not signed in, and the service requires it to be enabled.
-  SIGNED_OUT_AND_DISABLED,
-};
-
-// Aggregates data from preferences and signin to notify the snippet service of
-// relevant changes in their states.
-class NTPSnippetsStatusService {
- public:
-  using SnippetsStatusChangeCallback =
-      base::Callback<void(SnippetsStatus /*old_status*/,
-                          SnippetsStatus /*new_status*/)>;
-
-  NTPSnippetsStatusService(SigninManagerBase* signin_manager,
-                           PrefService* pref_service);
-
-  virtual ~NTPSnippetsStatusService();
-
-  static void RegisterProfilePrefs(PrefRegistrySimple* registry);
-
-  // Starts listening for changes from the dependencies. |callback| will be
-  // called when a significant change in state is detected.
-  void Init(const SnippetsStatusChangeCallback& callback);
-
-  // To be called when the signin state changed. Will compute the new
-  // state considering the initialisation configuration and the preferences,
-  // and notify via the registered callback if appropriate.
-  void OnSignInStateChanged();
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(NTPSnippetsStatusServiceTest,
-                           SigninStateCompatibility);
-  FRIEND_TEST_ALL_PREFIXES(NTPSnippetsStatusServiceTest, DisabledViaPref);
-
-  // Callback for the PrefChangeRegistrar.
-  void OnSnippetsEnabledChanged();
-
-  void OnStateChanged(SnippetsStatus new_snippets_status);
-
-  bool IsSignedIn() const;
-
-  SnippetsStatus GetSnippetsStatusFromDeps() const;
-
-  SnippetsStatus snippets_status_;
-  SnippetsStatusChangeCallback snippets_status_change_callback_;
-
-  bool require_signin_;
-  SigninManagerBase* signin_manager_;
-  PrefService* pref_service_;
-
-  PrefChangeRegistrar pref_change_registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(NTPSnippetsStatusService);
-};
-
-}  // namespace ntp_snippets
-
-#endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_STATUS_SERVICE_H_