Make SDCH dictionaries persistent across browser restart.

net/sdch/sdch_owner_unittest.cc

 // Copyright 2014 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 "base/memory/memory_pressure_listener.h"
+#include "base/prefs/testing_pref_store.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/simple_test_clock.h"
+#include "base/values.h"
 #include "net/base/net_log.h"
 #include "net/base/sdch_manager.h"
 #include "net/sdch/sdch_owner.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_error_job.h"
 #include "net/url_request/url_request_job.h"
 #include "net/url_request/url_request_job_factory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 94 matching lines @@
 
   bool IsHandledURL(const GURL& url) const override {
     return url.SchemeIs("http");
   }
 
   bool IsSafeRedirectTarget(const GURL& location) const override {
     return false;
   }
 };
 
+// TestingPrefStore with some additional helper methods.
+class SdchTestingPrefStore : public TestingPrefStore {
+ public:
+  void CreateFirstLevelDictionary(const std::string& key) {
+    SetValue(key, new base::DictionaryValue());
+  }
+
+  // All of the following require that the parent dictionaries already exist.
+  void CreateSecondLevelDictionary(const std::string& key1,
+                                   const std::string& key2) {
+    base::Value* dict1_as_value;
+    base::DictionaryValue* dict1_as_dict;
+    bool success = GetMutableValue(key1, &dict1_as_value);
+    DCHECK(success);
+    success = dict1_as_value->GetAsDictionary(&dict1_as_dict);
+    DCHECK(success);
+    dict1_as_dict->Set(key2, new base::DictionaryValue());
+  }
+
+  void SetSecondLevelInteger(const std::string& key1,
+                             const std::string& key2,
+                             int value) {
+    base::Value* dict1_as_value;
+    base::DictionaryValue* dict1_as_dict;
+    bool success = GetMutableValue(key1, &dict1_as_value);
+    DCHECK(success);
+    success = dict1_as_value->GetAsDictionary(&dict1_as_dict);
+    DCHECK(success);
+    dict1_as_dict->SetInteger(key2, value);
+  }
+
+  void CreateThirdLevelDictionary(const std::string& key1,
+                                  const std::string& key2,
+                                  const std::string& key3) {
+    GetSecondLevelDict(key1, key2)->Set(key3, new base::DictionaryValue());
+  }
+
+  void SetFourthLevelInteger(const std::string& key1,
+                             const std::string& key2,
+                             const std::string& key3,
+                             const std::string& key4,
+                             int value) {
+    GetThirdLevelDict(key1, key2, key3)->SetInteger(key4, value);
+  }
+
+  void SetFourthLevelString(const std::string& key1,
+                            const std::string& key2,
+                            const std::string& key3,
+                            const std::string& key4,
+                            const std::string& value) {
+    GetThirdLevelDict(key1, key2, key3)->SetString(key4, value);
+  }
+
+  void SetFourthLevelDouble(const std::string& key1,
+                            const std::string& key2,
+                            const std::string& key3,
+                            const std::string& key4,
+                            double value) {
+    GetThirdLevelDict(key1, key2, key3)->SetDouble(key4, value);
+  }
+
+ private:
+  base::DictionaryValue* GetSecondLevelDict(const std::string& key1,
+                                            const std::string& key2) {
+    base::Value* dict1_as_value;
+    base::DictionaryValue* dict1_as_dict;
+    bool success = GetMutableValue(key1, &dict1_as_value);
+    DCHECK(success);
+    success = dict1_as_value->GetAsDictionary(&dict1_as_dict);
+    DCHECK(success);
+
+    base::Value* dict2_as_value;
+    base::DictionaryValue* dict2_as_dict;
+    success = dict1_as_dict->Get(key2, &dict2_as_value);
+    DCHECK(success);
+    success = dict2_as_value->GetAsDictionary(&dict2_as_dict);
+    DCHECK(success);
+    return dict2_as_dict;
+  }
+
+  base::DictionaryValue* GetThirdLevelDict(const std::string& key1,
+                                           const std::string& key2,
+                                           const std::string& key3) {
+    base::Value* dict3_as_value;
+    base::DictionaryValue* dict3_as_dict;
+    bool success = GetSecondLevelDict(key1, key2)->Get(key3, &dict3_as_value);
+    DCHECK(success);
+    success = dict3_as_value->GetAsDictionary(&dict3_as_dict);
+    DCHECK(success);
+    return dict3_as_dict;
+  }
+};
+
+// File testing infrastructure summary:
+// * NewSdchDictionary(): Creates a dictionary of a specific size.
+// * URLRequestErrorCountingJob: A URLRequestJob that returns an error
+//   and counts the number of outstanding (started but not finished)
+//   jobs, and calls a global callback when that number transitions to zero.
+// * MockURLRequestJobFactory: Factory to create the above jobs.  Tracks
+//   the number of jobs created.
+// * SdchTestingPrefStore: A persistent pref store that can be configured
+//   for testing SdchOwner persistence functionality.
+// * SdchOwnerTest: Interfaces
+//      * Access manager, owner, and net log
+//      * Return the number of jobs created in a time interval
+//      * Return dictionary present in the manager
+//      * Notify SdchOwner of an incoming dictionary (& wait until jobs clear)
+//      * Attempt to add a dictionary and test for success.
+// Test patterns:
+//      * Let the owner know about a Get-Dictionary header and test for
+//        appropriate jobs being created.
+//      * Let the owner know that a dictionary was successfully fetched
+//        and test for appropriate outcome.
+//      * Either of the above, having previously added dictionaries to create
+//        a particular initial state.
 class SdchOwnerTest : public testing::Test {
  public:
   static const size_t kMaxSizeForTesting = 1000 * 50;
   static const size_t kMinFetchSpaceForTesting = 500;
 
   SdchOwnerTest()
       : last_jobs_created_(error_jobs_created),
         dictionary_creation_index_(0),
+        pref_store_(new SdchTestingPrefStore),
         sdch_owner_(&sdch_manager_, &url_request_context_) {
     // Any jobs created on this context will immediately error,
     // which leaves the test in control of signals to SdchOwner.
     url_request_context_.set_job_factory(&job_factory_);
 
     // Reduce sizes to reduce time for string operations.
     sdch_owner_.SetMaxTotalDictionarySize(kMaxSizeForTesting);
     sdch_owner_.SetMinSpaceForDictionaryFetch(kMinFetchSpaceForTesting);
   }
 
   SdchManager& sdch_manager() { return sdch_manager_; }
   SdchOwner& sdch_owner() { return sdch_owner_; }
   BoundNetLog& bound_net_log() { return net_log_; }
+  SdchTestingPrefStore& pref_store() { return *(pref_store_.get()); }
 
   int JobsRecentlyCreated() {
     int result = error_jobs_created - last_jobs_created_;
     last_jobs_created_ = error_jobs_created;
     return result;
   }
 
   bool DictionaryPresentInManager(const std::string& server_hash) {
     // Presumes all tests use generic url.
     SdchProblemCode tmp;
     scoped_ptr<SdchManager::DictionarySet> set(
         sdch_manager_.GetDictionarySetByHash(GURL(generic_url), server_hash,
                                              &tmp));
     return !!set.get();
   }
 
-  void SignalGetDictionaryAndClearJobs(GURL request_url, GURL dictionary_url) {
-    sdch_owner().OnGetDictionary(&sdch_manager_, request_url, dictionary_url);
+  void WaitForNoJobs() {
     if (outstanding_url_request_error_counting_jobs == 0)
       return;
+
     base::RunLoop run_loop;
     base::Closure quit_closure(run_loop.QuitClosure());
     empty_url_request_jobs_callback = &quit_closure;
     run_loop.Run();
     empty_url_request_jobs_callback = NULL;
   }
 
+  void SignalGetDictionaryAndClearJobs(GURL request_url, GURL dictionary_url) {
+    sdch_owner().OnGetDictionary(&sdch_manager_, request_url, dictionary_url);
+    WaitForNoJobs();
+  }
+
   // Create a unique (by hash) dictionary of the given size,
   // associate it with a unique URL, add it to the manager through
   // SdchOwner::OnDictionaryFetched(), and return whether that
   // addition was successful or not.
-  bool CreateAndAddDictionary(size_t size, std::string* server_hash_p) {
+  bool CreateAndAddDictionary(size_t size,
+                              std::string* server_hash_p,
+                              base::Time last_used_time) {
     GURL dictionary_url(
         base::StringPrintf("%s/d%d", generic_url, dictionary_creation_index_));
     std::string dictionary_text(NewSdchDictionary(size - 4));
     dictionary_text += base::StringPrintf("%04d", dictionary_creation_index_);
     ++dictionary_creation_index_;
     std::string client_hash;
     std::string server_hash;
     SdchManager::GenerateHash(dictionary_text, &client_hash, &server_hash);
 
     if (DictionaryPresentInManager(server_hash))
       return false;
-    sdch_owner().OnDictionaryFetched(dictionary_text, dictionary_url, net_log_);
+    sdch_owner().OnDictionaryFetched(last_used_time, 0, dictionary_text,
+                                     dictionary_url, net_log_);
     if (server_hash_p)
       *server_hash_p = server_hash;
     return DictionaryPresentInManager(server_hash);
   }
 
  private:
   int last_jobs_created_;
   BoundNetLog net_log_;
   int dictionary_creation_index_;
 
   // The dependencies of these objects (sdch_owner_ -> {sdch_manager_,
   // url_request_context_}, url_request_context_->job_factory_) require
   // this order for correct destruction semantics.
   MockURLRequestJobFactory job_factory_;
   URLRequestContext url_request_context_;
   SdchManager sdch_manager_;
+  scoped_refptr<SdchTestingPrefStore> pref_store_;
   SdchOwner sdch_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(SdchOwnerTest);
 };
 
 // Does OnGetDictionary result in a fetch when there's enough space, and not
 // when there's not?
 TEST_F(SdchOwnerTest, OnGetDictionary_Fetching) {
   GURL request_url(std::string(generic_url) + "/r1");
 
   // Fetch generated when empty.
   GURL dict_url1(std::string(generic_url) + "/d1");
   EXPECT_EQ(0, JobsRecentlyCreated());
   SignalGetDictionaryAndClearJobs(request_url, dict_url1);
   EXPECT_EQ(1, JobsRecentlyCreated());
 
   // Fetch generated when half full.
   GURL dict_url2(std::string(generic_url) + "/d2");
   std::string dictionary1(NewSdchDictionary(kMaxSizeForTesting / 2));
-  sdch_owner().OnDictionaryFetched(dictionary1, dict_url1, bound_net_log());
+  sdch_owner().OnDictionaryFetched(base::Time::Now(), 1, dictionary1, dict_url1,
+                                   bound_net_log());
   EXPECT_EQ(0, JobsRecentlyCreated());
   SignalGetDictionaryAndClearJobs(request_url, dict_url2);
   EXPECT_EQ(1, JobsRecentlyCreated());
 
   // Fetch not generated when close to completely full.
   GURL dict_url3(std::string(generic_url) + "/d3");
   std::string dictionary2(NewSdchDictionary(
       (kMaxSizeForTesting / 2 - kMinFetchSpaceForTesting / 2)));
-  sdch_owner().OnDictionaryFetched(dictionary2, dict_url2, bound_net_log());
+  sdch_owner().OnDictionaryFetched(base::Time::Now(), 1, dictionary2, dict_url2,
+                                   bound_net_log());
   EXPECT_EQ(0, JobsRecentlyCreated());
   SignalGetDictionaryAndClearJobs(request_url, dict_url3);
   EXPECT_EQ(0, JobsRecentlyCreated());
 }
 
 // Make sure attempts to add dictionaries do what they should.
 TEST_F(SdchOwnerTest, OnDictionaryFetched_Fetching) {
   GURL request_url(std::string(generic_url) + "/r1");
   std::string client_hash;
   std::string server_hash;
 
+  // In the past, but still fresh for an unused dictionary.
+  base::Time dictionary_last_used_time(base::Time::Now() -
+                                       base::TimeDelta::FromMinutes(30));
+
   // Add successful when empty.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr,
+                                     dictionary_last_used_time));
   EXPECT_EQ(0, JobsRecentlyCreated());
 
   // Add successful when half full.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr,
+                                     dictionary_last_used_time));
   EXPECT_EQ(0, JobsRecentlyCreated());
 
   // Add unsuccessful when full.
-  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr));
+  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting / 2, nullptr,
+                                      dictionary_last_used_time));
   EXPECT_EQ(0, JobsRecentlyCreated());
 }
 
 // Confirm auto-eviction happens if space is needed.
 TEST_F(SdchOwnerTest, ConfirmAutoEviction) {
   std::string server_hash_d1;
   std::string server_hash_d2;
   std::string server_hash_d3;
 
   // Add two dictionaries, one recent, one more than a day in the past.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d1));
+  base::Time fresh(base::Time::Now() - base::TimeDelta::FromHours(23));
+  base::Time stale(base::Time::Now() - base::TimeDelta::FromHours(25));
 
-  scoped_ptr<base::SimpleTestClock> clock(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(2));
-  sdch_owner().SetClockForTesting(clock.Pass());
-
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d2));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d1, fresh));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d2, stale));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
 
-  // The addition of a new dictionary should succeed, evicting the old one.
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now());
-  sdch_owner().SetClockForTesting(clock.Pass());
-
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d3));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d3, fresh));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
 }
 
 // Confirm auto-eviction happens if space is needed, with a more complicated
 // situation
 TEST_F(SdchOwnerTest, ConfirmAutoEviction_2) {
   std::string server_hash_d1;
   std::string server_hash_d2;
   std::string server_hash_d3;
 
   // Add dictionaries, one recent, two more than a day in the past that
   // between them add up to the space needed.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d1));
+  base::Time fresh(base::Time::Now() - base::TimeDelta::FromHours(23));
+  base::Time stale(base::Time::Now() - base::TimeDelta::FromHours(25));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d1, fresh));
 
-  scoped_ptr<base::SimpleTestClock> clock(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(2));
-  sdch_owner().SetClockForTesting(clock.Pass());
-
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2));
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2, stale));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3, stale));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
 
-  // The addition of a new dictionary should succeed, evicting the old one.
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now());
-  sdch_owner().SetClockForTesting(clock.Pass());
-
   std::string server_hash_d4;
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4, fresh));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d3));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d4));
 }
 
 // Confirm if only one dictionary needs to be evicted it's the oldest.
 TEST_F(SdchOwnerTest, ConfirmAutoEviction_Oldest) {
   std::string server_hash_d1;
   std::string server_hash_d2;
   std::string server_hash_d3;
 
   // Add dictionaries, one recent, one two days in the past, and one
   // four days in the past.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1));
+  base::Time fresh(base::Time::Now() - base::TimeDelta::FromHours(23));
+  base::Time stale_newer(base::Time::Now() - base::TimeDelta::FromHours(47));
+  base::Time stale_older(base::Time::Now() - base::TimeDelta::FromHours(71));
 
-  scoped_ptr<base::SimpleTestClock> clock(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(2));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1, fresh));
 
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(4));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2,
+                                     stale_newer));
+
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3,
+                                     stale_older));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
 
   // The addition of a new dictionary should succeed, evicting only the
   // oldest one.
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now());
-  sdch_owner().SetClockForTesting(clock.Pass());
 
   std::string server_hash_d4;
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4, fresh));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d3));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d4));
 }
 
 // Confirm using a dictionary changes eviction behavior properly.
 TEST_F(SdchOwnerTest, UseChangesEviction) {
   std::string server_hash_d1;
   std::string server_hash_d2;
   std::string server_hash_d3;
 
   // Add dictionaries, one recent, one two days in the past, and one
   // four days in the past.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1));
+  base::Time fresh(base::Time::Now() - base::TimeDelta::FromHours(23));
+  base::Time stale_newer(base::Time::Now() - base::TimeDelta::FromHours(47));
+  base::Time stale_older(base::Time::Now() - base::TimeDelta::FromHours(71));
 
-  scoped_ptr<base::SimpleTestClock> clock(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(2));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1, fresh));
 
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(4));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2,
+                                     stale_newer));
+
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3,
+                                     stale_older));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
 
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now());
-  sdch_owner().SetClockForTesting(clock.Pass());
-
   // Use the oldest dictionary.
   sdch_owner().OnDictionaryUsed(&sdch_manager(), server_hash_d3);
 
   // The addition of a new dictionary should succeed, evicting only the
   // newer stale one.
   std::string server_hash_d4;
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4, fresh));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d4));
 }
 
 // Confirm using a dictionary can prevent the addition of a new dictionary.
 TEST_F(SdchOwnerTest, UsePreventsAddition) {
   std::string server_hash_d1;
   std::string server_hash_d2;
   std::string server_hash_d3;
 
   // Add dictionaries, one recent, one two days in the past, and one
   // four days in the past.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1));
+  base::Time fresh(base::Time::Now() - base::TimeDelta::FromMinutes(30));
+  base::Time stale_newer(base::Time::Now() - base::TimeDelta::FromHours(47));
+  base::Time stale_older(base::Time::Now() - base::TimeDelta::FromHours(71));
 
-  scoped_ptr<base::SimpleTestClock> clock(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(2));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d1, fresh));
 
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now() - base::TimeDelta::FromDays(4));
-  sdch_owner().SetClockForTesting(clock.Pass());
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d2,
+                                     stale_newer));
+
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting / 4, &server_hash_d3,
+                                     stale_older));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
 
-  clock.reset(new base::SimpleTestClock);
-  clock->SetNow(base::Time::Now());
-  sdch_owner().SetClockForTesting(clock.Pass());
-
   // Use the older dictionaries.
   sdch_owner().OnDictionaryUsed(&sdch_manager(), server_hash_d2);
   sdch_owner().OnDictionaryUsed(&sdch_manager(), server_hash_d3);
 
   // The addition of a new dictionary should fail, not evicting anything.
   std::string server_hash_d4;
-  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4));
+  EXPECT_FALSE(
+      CreateAndAddDictionary(kMaxSizeForTesting / 2, &server_hash_d4, fresh));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d2));
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d3));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d4));
 }
 
 // Confirm clear gets all the space back.
 TEST_F(SdchOwnerTest, ClearReturnsSpace) {
   std::string server_hash_d1;
   std::string server_hash_d2;
 
   // Take up all the space.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d1));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d1,
+                                     base::Time::Now()));
 
   // Addition should fail.
-  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d2));
+  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d2,
+                                      base::Time::Now()));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
 
   sdch_manager().ClearData();
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
 
   // Addition should now succeed.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, nullptr));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting, nullptr, base::Time::Now()));
 }
 
 // Confirm memory pressure gets all the space back.
 TEST_F(SdchOwnerTest, MemoryPressureReturnsSpace) {
   std::string server_hash_d1;
   std::string server_hash_d2;
 
   // Take up all the space.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d1));
+  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d1,
+                                     base::Time::Now()));
 
   // Addition should fail.
-  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d2));
+  EXPECT_FALSE(CreateAndAddDictionary(kMaxSizeForTesting, &server_hash_d2,
+                                      base::Time::Now()));
 
   EXPECT_TRUE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
 
   base::MemoryPressureListener::NotifyMemoryPressure(
       base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE);
   // The notification may have (implementation note: does :-}) use a PostTask,
   // so we drain the local message queue.  This should be safe (i.e. not have
   // an inifinite number of messages) in a unit test.
   base::RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d1));
   EXPECT_FALSE(DictionaryPresentInManager(server_hash_d2));
 
   // Addition should now succeed.
-  EXPECT_TRUE(CreateAndAddDictionary(kMaxSizeForTesting, nullptr));
+  EXPECT_TRUE(
+      CreateAndAddDictionary(kMaxSizeForTesting, nullptr, base::Time::Now()));
+}
+
+// Test an empty persistence store.
+TEST_F(SdchOwnerTest, Persistent_Empty) {
+  pref_store().SetInitializationCompleted();
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(0, JobsRecentlyCreated());
+}
+
+// Test a persistence store with an empty dictionary.
+TEST_F(SdchOwnerTest, Persistent_EmptyDict) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(0, JobsRecentlyCreated());
+}
+
+// Test a persistence store with a bad version number.
+TEST_F(SdchOwnerTest, Persistent_BadVersion) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetSecondLevelInteger("SDCH", "version", 2);
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(0, JobsRecentlyCreated());
+}
+
+// Test a persistence store with a bad version number.
+TEST_F(SdchOwnerTest, Persistent_EmptyDictList) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetSecondLevelInteger("SDCH", "version", 1);
+  pref_store().CreateSecondLevelDictionary("SDCH", "dictionaries");
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(0, JobsRecentlyCreated());
+}
+
+// Test a persistence store with a single good dictionary.
+TEST_F(SdchOwnerTest, Persistent_OneDict) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetSecondLevelInteger("SDCH", "version", 1);
+  pref_store().CreateSecondLevelDictionary("SDCH", "dictionaries");
+  pref_store().CreateThirdLevelDictionary("SDCH", "dictionaries", "hashhash");
+  pref_store().SetFourthLevelString("SDCH", "dictionaries", "hashhash", "url",
+                                    "http://sample.toplevel.com/dict");
+  pref_store().SetFourthLevelInteger("SDCH", "dictionaries", "hashhash",
+                                     "use_count", 1);
+  pref_store().SetFourthLevelDouble("SDCH", "dictionaries", "hashhash",
+                                    "last_used", base::Time::Now().ToDoubleT());
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(1, JobsRecentlyCreated());
+}
+
+// Test a persistence store with two good dictionaries.
+TEST_F(SdchOwnerTest, Persistent_TwoDict) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetSecondLevelInteger("SDCH", "version", 1);
+  pref_store().CreateSecondLevelDictionary("SDCH", "dictionaries");
+  pref_store().CreateThirdLevelDictionary("SDCH", "dictionaries", "hashhash");
+  pref_store().SetFourthLevelString("SDCH", "dictionaries", "hashhash", "url",
+                                    "http://sample.toplevel.com/dict");
+  pref_store().SetFourthLevelInteger("SDCH", "dictionaries", "hashhash",
+                                     "use_count", 1);
+  pref_store().SetFourthLevelDouble("SDCH", "dictionaries", "hashhash",
+                                    "last_used", base::Time::Now().ToDoubleT());
+  pref_store().CreateThirdLevelDictionary("SDCH", "dictionaries", "hashhss2");
+  pref_store().SetFourthLevelString("SDCH", "dictionaries", "hashhss2", "url",
+                                    "http://sample.toplevel.com/dict2");
+  pref_store().SetFourthLevelInteger("SDCH", "dictionaries", "hashhss2",
+                                     "use_count", 1);
+  pref_store().SetFourthLevelDouble("SDCH", "dictionaries", "hashhss2",
+                                    "last_used", base::Time::Now().ToDoubleT());
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(2, JobsRecentlyCreated());
+}
+
+// Test a persistence store with one good and one bad dictionary.
+TEST_F(SdchOwnerTest, Persistent_OneBad) {
+  pref_store().CreateFirstLevelDictionary("SDCH");
+  pref_store().SetSecondLevelInteger("SDCH", "version", 1);
+  pref_store().CreateSecondLevelDictionary("SDCH", "dictionaries");
+  pref_store().CreateThirdLevelDictionary("SDCH", "dictionaries", "hashhash");
+  pref_store().SetFourthLevelString("SDCH", "dictionaries", "hashhash", "url",
+                                    "http://sample.toplevel.com/dict");
+  pref_store().SetFourthLevelInteger("SDCH", "dictionaries", "hashhash",
+                                     "use_count", 1);
+  pref_store().SetFourthLevelDouble("SDCH", "dictionaries", "hashhash",
+                                    "last_used", base::Time::Now().ToDoubleT());
+
+  pref_store().CreateThirdLevelDictionary("SDCH", "dictionaries", "hashhss2");
+  pref_store().SetFourthLevelString("SDCH", "dictionaries", "hashhss2", "url",
+                                    "http://sample.toplevel.com/dict2");
+  pref_store().SetFourthLevelDouble("SDCH", "dictionaries", "hashhss2",
+                                    "last_used", base::Time::Now().ToDoubleT());
+  pref_store().SetInitializationCompleted();
+
+  EXPECT_EQ(0, JobsRecentlyCreated());
+  sdch_owner().EnablePersistentStorage(&pref_store());
+  WaitForNoJobs();
+  EXPECT_EQ(1, JobsRecentlyCreated());
 }
 
 }  // namespace net