Report Precache.TimeSinceLastPrecache

components/precache/content/precache_manager_unittest.cc

 // Copyright 2013 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/precache/content/precache_manager.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
@@ skipping 225 matching lines @@
   unfinished_work->add_top_host()->set_hostname("evil-manifest.com");
   unfinished_work->set_start_time(base::Time::Now().ToInternalValue());
   precache_database_->SaveUnfinishedWork(std::move(unfinished_work));
 
   EXPECT_FALSE(precache_manager_->IsPrecaching());
 
   factory_.SetFakeResponse(
       GURL(kEvilManifestURL), "",
       net::HTTP_OK, net::URLRequestStatus::SUCCESS);
 
+  ASSERT_TRUE(precache_database_->GetLastPrecacheTimestamp().is_null());
+
   precache_manager_->StartPrecaching(precache_callback_.GetCallback());
   EXPECT_TRUE(precache_manager_->IsPrecaching());
 
   base::RunLoop().RunUntilIdle();  // For PrecacheFetcher.
   EXPECT_FALSE(precache_manager_->IsPrecaching());
   EXPECT_TRUE(precache_callback_.was_on_done_called());
 
+  // The LastPrecacheTimestamp has been set.
+  EXPECT_FALSE(precache_database_->GetLastPrecacheTimestamp().is_null());
+
   std::multiset<GURL> expected_requested_urls;
   expected_requested_urls.insert(GURL(kConfigURL));
   expected_requested_urls.insert(GURL(kEvilManifestURL));
   EXPECT_EQ(expected_requested_urls, url_callback_.requested_urls());
 }
 
 TEST_F(PrecacheManagerTest,
        StartAndCancelPrecachingBeforeUnfinishedWorkRetrieved) {
   EXPECT_FALSE(precache_manager_->IsPrecaching());
 
@@ skipping 235 matching lines @@
 
   // A fetch for the same URL as the expired precache was served from the cache,
   // but it isn't reported as saved bytes because it had expired in the precache
   // history.
   precache_manager_->RecordStatsForFetch(GURL("http://old-fetch.com"), GURL(),
                                         base::TimeDelta(), kCurrentTime, 1000,
                                         true);
   expected_histogram_count_map["Precache.Fetch.TimeToComplete"]++;
   expected_histogram_count_map["Precache.Latency.NonPrefetch"]++;
   expected_histogram_count_map["Precache.Latency.NonPrefetch.NonTopHosts"]++;
+  expected_histogram_count_map["Precache.TimeSinceLastPrecache"] += 1;
 
   base::RunLoop().RunUntilIdle();
   EXPECT_THAT(histograms_.GetTotalCountsForPrefix("Precache."),
               ContainerEq(expected_histogram_count_map));
 
   // The other precaches should not have expired, so the following fetches from
   // the cache should count as saved bytes.
   precache_manager_->RecordStatsForFetch(GURL("http://recent-fetch.com"), GURL(),
                                         base::TimeDelta(), kCurrentTime, 1000,
                                         true);
   precache_manager_->RecordStatsForFetch(GURL("http://yesterday-fetch.com"),
                                         GURL(), base::TimeDelta(), kCurrentTime,
                                         1000, true);
   expected_histogram_count_map["Precache.Latency.NonPrefetch"] += 2;
   expected_histogram_count_map["Precache.Latency.NonPrefetch.NonTopHosts"] += 2;
   expected_histogram_count_map["Precache.Saved"] += 2;
+  expected_histogram_count_map["Precache.TimeSinceLastPrecache"] += 2;
 
   base::RunLoop().RunUntilIdle();
   EXPECT_THAT(histograms_.GetTotalCountsForPrefix("Precache."),
               ContainerEq(expected_histogram_count_map));
 }
 
 }  // namespace precache