Activate the VariationsService for ChromeOS and ensure that it does not ping the server until the E…

chrome/browser/metrics/variations/variations_service_unittest.cc

 // Copyright (c) 2012 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/base64.h"
 #include "base/string_split.h"
 #include "chrome/browser/metrics/proto/study.pb.h"
+#include "chrome/browser/metrics/variations/resource_request_allowed_notifier_test_util.h"
 #include "chrome/browser/metrics/variations/variations_service.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_pref_service.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chrome_variations {
 
 namespace {
 
 // A test class used to validate expected functionality in VariationsService.
 class TestVariationsService : public VariationsService {
  public:
-  TestVariationsService() : VariationsService(),
-                            fetch_attempted_(false) {
-  }
-  virtual ~TestVariationsService() {}
+  explicit TestVariationsService();
+  virtual ~TestVariationsService();
 
   bool fetch_attempted() const { return fetch_attempted_; }
-  void SetFetchAttempted(bool attempted) { fetch_attempted_ = attempted; }
+
+  void SetRequestsAllowed(bool allowed);

[Alexei Svitkine (slow), 2012/09/20 21:39:03]

It seems both SetRequestsAllowed() and NotifyObservers() just pipe things
through to the underlying TestRequestAllowedNotifier and the constructor of this
class is quite complex.

I think you can simplify things by just having TestVariationsService() offer the
same constructor that takes the RequestAllowedNotifier as a param.

Then, the test itself could just allocate the TestRequestedAllowedNotifier and
call stuff on it (like SetRequestsAllowed() and NotifyObservers()).

e.g. the test code in ResourceRequestAllowedNotifierTest look like:

TestRequestAllowedNotifier* test_notifier = new TestRequestAllowedNotifier;
TestVariationsService test_variations_service(test_notifier);
test_notifier->SetRequestsAllowed(false);
....



For the other tests that don't need to call these functions, they can either do:


TestVariationsService test_variations_service(new TestRequestAllowedNotifier);

Or you can add a default constructor that does that too.

[SteveT, 2012/09/21 15:16:17]

Thanks for that suggestion - made things a lot nicer. Getting rid of the
GetRRANotifierForTesting method...

+
+  void NotifyObservers();
 
  protected:
-  virtual void FetchVariationsSeed() OVERRIDE {
+  virtual void DoActualFetch() OVERRIDE {
     fetch_attempted_ = true;
   }
 
  private:
   bool fetch_attempted_;
 
+  // Weak pointer to the base class' copy of the notifier.
+  TestRequestAllowedNotifier* test_notifier_;
+
   DISALLOW_COPY_AND_ASSIGN(TestVariationsService);
 };
 
-// Override NetworkChangeNotifier to simulate connection type changes for tests.
-class TestNetworkChangeNotifier : public net::NetworkChangeNotifier {
- public:
-  TestNetworkChangeNotifier()
-    : net::NetworkChangeNotifier(),
-      connection_type_to_return_(
-          net::NetworkChangeNotifier::CONNECTION_UNKNOWN) {
-  }
+TestVariationsService::TestVariationsService()
+    : VariationsService(new TestRequestAllowedNotifier),
+      fetch_attempted_(false),
+      // This is known to return a TestRequestAllowedNotifier* since it was
+      // created just above.
+      test_notifier_(static_cast<TestRequestAllowedNotifier*>(
+           GetResourceRequestAllowedNotifierForTesting())) {
+  // Set this so StartRepeatedVariationsSeedFetch can be called in tests.
+  SetCreateTrialsFromSeedCalledForTesting(true);
+}
 
-  void SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::ConnectionType type) {
-    connection_type_to_return_ = type;
-    net::NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
-    MessageLoop::current()->RunAllPending();
-  }
+TestVariationsService::~TestVariationsService() {
+}
 
- private:
-  virtual ConnectionType GetCurrentConnectionType() const OVERRIDE {
-    return connection_type_to_return_;
-  }
+void TestVariationsService::SetRequestsAllowed(bool allowed) {
+  test_notifier_->SetRequestsAllowed(allowed);
+}
 
-  net::NetworkChangeNotifier::ConnectionType connection_type_to_return_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestNetworkChangeNotifier);
-};
+void TestVariationsService::NotifyObservers() {
+  test_notifier_->NotifyObservers();
+}
 
 // Converts |time| to Study proto format.
 int64 TimeToProtoTime(const base::Time& time) {
   return (time - base::Time::UnixEpoch()).InSeconds();
 }
 
 // Populates |seed| with simple test data. The resulting seed will contain one
 // study called "test", which contains one experiment called "abc" with
 // probability weight 100. |seed|'s study field will be cleared before adding
 // the new study.
 TrialsSeed CreateTestSeed() {
   TrialsSeed seed;
   Study* study = seed.add_study();
   study->set_name("test");
   study->set_default_experiment_name("abc");
   Study_Experiment* experiment = study->add_experiment();
   experiment->set_name("abc");
   experiment->set_probability_weight(100);
   return seed;
 }
 
 }  // namespace
 
-// A test fixture class for VariationsService tests that require network state
-// simulations.
-class VariationsServiceNetworkTest : public testing::Test {
- public:
-  VariationsServiceNetworkTest()
-    : ui_thread(content::BrowserThread::UI, &message_loop) { }
-  ~VariationsServiceNetworkTest() { }
-
-  void SetWasOfflineDuringLastRequestAttempt(bool offline) {
-    test_service.SetWasOfflineDuringLastRequestAttemptForTesting(offline);
-  }
-
-  void SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::ConnectionType type) {
-    notifier.SimulateNetworkConnectionChange(type);
-  }
-
-  bool fetch_attempted() const {
-    return test_service.fetch_attempted();
-  }
-
- private:
-  MessageLoopForUI message_loop;
-  content::TestBrowserThread ui_thread;
-  TestNetworkChangeNotifier notifier;
-  TestVariationsService test_service;
-
-  DISALLOW_COPY_AND_ASSIGN(VariationsServiceNetworkTest);
-};
-
 TEST(VariationsServiceTest, CheckStudyChannel) {
   const chrome::VersionInfo::Channel channels[] = {
     chrome::VersionInfo::CHANNEL_CANARY,
     chrome::VersionInfo::CHANNEL_DEV,
     chrome::VersionInfo::CHANNEL_BETA,
     chrome::VersionInfo::CHANNEL_STABLE,
   };
   const Study_Channel study_channels[] = {
     Study_Channel_CANARY,
     Study_Channel_DEV,
@@ skipping 265 matching lines @@
 
   // Store good seed data to test if loading from prefs works.
   TrialsSeed seed = CreateTestSeed();
 
   std::string serialized_seed;
   seed.SerializeToString(&serialized_seed);
   std::string base64_serialized_seed;
   ASSERT_TRUE(base::Base64Encode(serialized_seed, &base64_serialized_seed));
   pref_service.SetString(prefs::kVariationsSeed, base64_serialized_seed);
 
-  VariationsService variations_service;
+  TestVariationsService variations_service;
   TrialsSeed loaded_seed;
   EXPECT_TRUE(
       variations_service.LoadTrialsSeedFromPref(&pref_service, &loaded_seed));
 
   std::string serialized_loaded_seed;
   loaded_seed.SerializeToString(&serialized_loaded_seed);
   // Check that the loaded data is the same as the original.
   EXPECT_EQ(serialized_seed, serialized_loaded_seed);
   // Make sure the pref hasn't been changed.
   EXPECT_FALSE(
@@ skipping 13 matching lines @@
 }
 
 TEST(VariationsServiceTest, StoreSeed) {
   TestingPrefService pref_service;
 
   VariationsService::RegisterPrefs(&pref_service);
   const base::Time now = base::Time::Now();
 
   TrialsSeed seed = CreateTestSeed();
 
-  VariationsService variations_service;
+  TestVariationsService variations_service;
   std::string serialized_seed;
   seed.SerializeToString(&serialized_seed);
   EXPECT_TRUE(
       variations_service.StoreSeedData(serialized_seed, now, &pref_service));
   // Make sure the pref was actually set.
   EXPECT_FALSE(
       pref_service.FindPreference(prefs::kVariationsSeed)->IsDefaultValue());
 
   std::string loaded_serialized_seed =
       pref_service.GetString(prefs::kVariationsSeed);
@@ skipping 78 matching lines @@
       &total_probability);
   ASSERT_TRUE(valid);
   Study_Experiment* repeated_group = study.add_experiment();
   repeated_group->set_name("abc");
   repeated_group->set_probability_weight(1);
   valid = VariationsService::ValidateStudyAndComputeTotalProbability(study,
       &total_probability);
   EXPECT_FALSE(valid);
 }
 
-TEST_F(VariationsServiceNetworkTest, DoNotFetchIfOffline) {
-  SetWasOfflineDuringLastRequestAttempt(true);
-  SimulateNetworkConnectionChange(net::NetworkChangeNotifier::CONNECTION_NONE);
-  EXPECT_FALSE(fetch_attempted());
-}
+TEST(VariationsServiceTest, ResourceRequestAllowedNotifierTest) {
+  MessageLoopForUI message_loop;
+  content::TestBrowserThread ui_thread(content::BrowserThread::UI,
+                                       &message_loop);
 
-TEST_F(VariationsServiceNetworkTest, DoNotFetchIfOnlineToOnline) {
-  SetWasOfflineDuringLastRequestAttempt(false);
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_ETHERNET);
-  EXPECT_FALSE(fetch_attempted());
-}
-
-TEST_F(VariationsServiceNetworkTest, FetchOnReconnect) {
-  SetWasOfflineDuringLastRequestAttempt(true);
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_ETHERNET);
-  EXPECT_TRUE(fetch_attempted());
-}
-
-TEST_F(VariationsServiceNetworkTest, NoFetchOnWardriving) {
-  SetWasOfflineDuringLastRequestAttempt(false);
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_WIFI);
-  EXPECT_FALSE(fetch_attempted());
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_3G);
-  EXPECT_FALSE(fetch_attempted());
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_4G);
-  EXPECT_FALSE(fetch_attempted());
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_WIFI);
-  EXPECT_FALSE(fetch_attempted());
-}
-
-TEST_F(VariationsServiceNetworkTest, NoFetchOnFlakyConnection) {
-  SetWasOfflineDuringLastRequestAttempt(false);
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_WIFI);
-  EXPECT_FALSE(fetch_attempted());
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_NONE);
-  EXPECT_FALSE(fetch_attempted());
-  SimulateNetworkConnectionChange(
-      net::NetworkChangeNotifier::CONNECTION_WIFI);
-  EXPECT_FALSE(fetch_attempted());
+  // Pass ownership to TestVariationsService, but keep a weak pointer to
+  // manipulate it for this test.
+  TestVariationsService test_service;
+  test_service.SetRequestsAllowed(false);
+  test_service.StartRepeatedVariationsSeedFetch();
+  EXPECT_FALSE(test_service.fetch_attempted());
+  test_service.NotifyObservers();
+  EXPECT_TRUE(test_service.fetch_attempted());
 }
 
 }  // namespace chrome_variations