Add a unit test for the BookmarkSuggestionsProvider.

components/ntp_snippets/mock_content_suggestions_provider.cc

+// 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.
+
+#include "components/ntp_snippets/mock_content_suggestions_provider.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/strings/utf_string_conversions.h"
+
+namespace ntp_snippets {
+
+MockProvider::MockProvider(Observer* observer,
+               const std::vector<Category>& provided_categories)
+      : ContentSuggestionsProvider(observer) {
+    SetProvidedCategories(provided_categories);
+}
+
+MockProvider::~MockProvider() {}
+
+void MockProvider::SetProvidedCategories(
+    const std::vector<Category>& provided_categories) {
+  statuses_.clear();
+  provided_categories_ = provided_categories;
+  for (Category category : provided_categories) {
+    statuses_[category.id()] = CategoryStatus::AVAILABLE;
+  }
+}
+
+CategoryStatus MockProvider::GetCategoryStatus(Category category) {
+  return statuses_[category.id()];
+}
+
+CategoryInfo MockProvider::GetCategoryInfo(Category category) {
+  return CategoryInfo(base::ASCIIToUTF16("Section title"),
+                      ContentSuggestionsCardLayout::FULL_CARD, true, false,
+                      true, false,
+                      base::ASCIIToUTF16("No suggestions message"));
+}
+
+void MockProvider::FireSuggestionsChanged(
+    Category category,
+    std::vector<ContentSuggestion> suggestions) {
+  observer()->OnNewSuggestions(this, category, std::move(suggestions));
+}
+
+void MockProvider::FireCategoryStatusChanged(Category category,
+                                             CategoryStatus new_status) {
+  statuses_[category.id()] = new_status;
+  observer()->OnCategoryStatusChanged(this, category, new_status);
+}
+
+void MockProvider::FireCategoryStatusChangedWithCurrentStatus(
+    Category category) {
+  observer()->OnCategoryStatusChanged(this, category, statuses_[category.id()]);
+}
+
+void MockProvider::FireSuggestionInvalidated(
+    const ContentSuggestion::ID& suggestion_id) {
+  observer()->OnSuggestionInvalidated(this, suggestion_id);
+}
+
+}  // namespace ntp_snippets