Do not select old bookmarks in ntp_snippets::BookmarkSuggestionsProvider

components/ntp_snippets/bookmarks/bookmark_last_visit_utils_unittest.cc

+// 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.
+
+#include "components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h"
+
+#include <string>
+
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/bookmarks/browser/bookmark_model.h"
+#include "components/bookmarks/browser/bookmark_node.h"
+#include "components/bookmarks/test/test_bookmark_client.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+using bookmarks::BookmarkModel;
+using bookmarks::BookmarkNode;
+
+using testing::IsEmpty;
+using testing::SizeIs;
+using testing::UnorderedElementsAre;
+
+namespace ntp_snippets {
+
+namespace {
+
+const char kBookmarkLastVisitDateKey[] = "last_visited";
+
+std::unique_ptr<BookmarkModel> CreateModelWithRecentBookmarks(
+    int number_of_bookmarks,
+    int number_of_recent,
+    const base::Time& threshold_time) {
+  std::unique_ptr<BookmarkModel> model =
+      bookmarks::TestBookmarkClient::CreateModel();
+
+  base::TimeDelta week = base::TimeDelta::FromDays(7);
+  base::Time recent_time = threshold_time + week;
+  std::string recent_time_string =
+      base::Int64ToString(recent_time.ToInternalValue());
+  base::Time nonrecent_time = threshold_time - week;
+  std::string nonrecent_time_string =
+      base::Int64ToString(nonrecent_time.ToInternalValue());
+
+  for (int index = 0; index < number_of_bookmarks; ++index) {
+    base::string16 title =
+        base::ASCIIToUTF16(base::StringPrintf("title%d", index));
+    GURL url(base::StringPrintf("http://url%d.com", index));
+    const BookmarkNode* node =
+        model->AddURL(model->bookmark_bar_node(), index, title, url);
+
+    model->SetNodeMetaInfo(
+        node, kBookmarkLastVisitDateKey,
+        index < number_of_recent ? recent_time_string : nonrecent_time_string);
+  }
+
+  return model;
+}
+
+}  // namespace
+
+class GetRecentlyVisitedBookmarksTest : public testing::Test {
+ public:
+  GetRecentlyVisitedBookmarksTest() {
+    base::TimeDelta week = base::TimeDelta::FromDays(7);
+    threshold_time = base::Time::UnixEpoch() + 52 * week;
+  }
+
+  base::Time threshold_time;

[Marc Treib, 2016/09/01 11:16:32]

threshold_time_ (trailing underscore)

Also this should be private (or at least protected). If you make it private, you
could add a threshold_time() accessor.

[vitaliii, 2016/09/01 11:38:43]

Done.

+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GetRecentlyVisitedBookmarksTest);
+};
+
+TEST_F(GetRecentlyVisitedBookmarksTest,
+       WithoutDateFallbackShouldNotReturnNonRecent) {
+  const int number_of_recent = 0;
+  const int number_of_bookmarks = 3;
+  std::unique_ptr<BookmarkModel> model = CreateModelWithRecentBookmarks(
+      number_of_bookmarks, number_of_recent, threshold_time);
+
+  std::vector<const bookmarks::BookmarkNode*> result =
+      GetRecentlyVisitedBookmarks(model.get(), 0, number_of_bookmarks,
+                                  threshold_time,
+                                  /*creation_date_fallback=*/false);
+  EXPECT_THAT(result, IsEmpty());
+}
+
+TEST_F(GetRecentlyVisitedBookmarksTest, ShouldReturnNotMoreThanMaxCount) {
+  const int number_of_recent = 3;
+  const int number_of_bookmarks = number_of_recent;
+  std::unique_ptr<BookmarkModel> model = CreateModelWithRecentBookmarks(
+      number_of_bookmarks, number_of_recent, threshold_time);
+
+  std::vector<const bookmarks::BookmarkNode*> result =
+      GetRecentlyVisitedBookmarks(model.get(), number_of_recent - 1,

[Marc Treib, 2016/09/01 11:16:32]

nit: make a max_count variable, so it's clear what this value means?

[vitaliii, 2016/09/01 11:38:43]

Done.

+                                  number_of_recent - 1, threshold_time,
+                                  /*creation_date_fallback=*/false);
+  EXPECT_THAT(result, SizeIs(number_of_recent - 1));
+}
+
+}  // namespace ntp_snippets