Add a unit test for the BookmarkSuggestionsProvider.

components/ntp_snippets/mock_content_suggestions_provider.h

Index: components/ntp_snippets/mock_content_suggestions_provider.h
diff --git a/components/ntp_snippets/mock_content_suggestions_provider.h b/components/ntp_snippets/mock_content_suggestions_provider.h
new file mode 100644
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+++ b/components/ntp_snippets/mock_content_suggestions_provider.h
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+// 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 COMPONENTS_NTP_SNIPPETS_MOCK_CONTENT_SUGGESTIONS_PROVIDER_H_
+#define COMPONENTS_NTP_SNIPPETS_MOCK_CONTENT_SUGGESTIONS_PROVIDER_H_
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "components/ntp_snippets/content_suggestions_provider.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace ntp_snippets {
+
+// TODO(treib): This is a weird combination of a mock and a fake. Fix this.
+class MockContentSuggestionsProvider : public ContentSuggestionsProvider {
+ public:
+  MockContentSuggestionsProvider(
+      Observer* observer,
+      const std::vector<Category>& provided_categories);
+  ~MockContentSuggestionsProvider();
+
+  void SetProvidedCategories(const std::vector<Category>& provided_categories);
+
+  // Returns the status for |category|. The initial status in
+  // CatgoryStatus::AVAILABLE. Will be updated on FireCategoryStatusChanged
+  // events.
+  CategoryStatus GetCategoryStatus(Category category) override;
+
+  // Returns a hard-coded category info object.
+  CategoryInfo GetCategoryInfo(Category category) override;
+
+  // Forwards events to the underlying oberservers.
+  // TODO(tschumann): This functionality does not belong here. Whoever injected
+  // the observer into the constructor can as well notify the observer itself.
+  void FireSuggestionsChanged(Category category,
+                              std::vector<ContentSuggestion> suggestions);
+  void FireCategoryStatusChanged(Category category, CategoryStatus new_status);
+  void FireCategoryStatusChangedWithCurrentStatus(Category category);
+  void FireSuggestionInvalidated(const ContentSuggestion::ID& suggestion_id);
+
+  MOCK_METHOD3(ClearHistory,
+               void(base::Time begin,
+                    base::Time end,
+                    const base::Callback<bool(const GURL& url)>& filter));
+  MOCK_METHOD3(Fetch,
+               void(const Category&,
+                    const std::set<std::string>&,
+                    const FetchDoneCallback&));
+  MOCK_METHOD1(ClearCachedSuggestions, void(Category category));
+  MOCK_METHOD2(GetDismissedSuggestionsForDebugging,
+               void(Category category,
+                    const DismissedSuggestionsCallback& callback));
+  MOCK_METHOD1(ClearDismissedSuggestionsForDebugging, void(Category category));
+  MOCK_METHOD1(DismissSuggestion,
+               void(const ContentSuggestion::ID& suggestion_id));
+  MOCK_METHOD2(FetchSuggestionImage,
+               void(const ContentSuggestion::ID& suggestion_id,
+                    const ImageFetchedCallback& callback));
+
+ private:
+  std::vector<Category> provided_categories_;
+  std::map<int, CategoryStatus> statuses_;
+};
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_MOCK_CONTENT_SUGGESTIONS_PROVIDER_H_