sync/notifier/gcm_network_channel_unittest.cc - chromium/src.git - Git at Google

 // 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/run_loop.h"
 #include "base/strings/string_util.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_request_test_util.h"
 #include "sync/notifier/gcm_network_channel.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace syncer {

 class TestGCMNetworkChannelDelegate : public GCMNetworkChannelDelegate {
  public:
   TestGCMNetworkChannelDelegate()
       : register_call_count_(0) {}

   virtual void Initialize() OVERRIDE {}

   virtual void RequestToken(RequestTokenCallback callback) OVERRIDE {
     request_token_callback = callback;
   }

   virtual void InvalidateToken(const std::string& token) OVERRIDE {
     invalidated_token = token;
   }

   virtual void Register(RegisterCallback callback) OVERRIDE {
     ++register_call_count_;
     register_callback = callback;
   }

   virtual void SetMessageReceiver(MessageCallback callback) OVERRIDE {
     message_callback = callback;
   }

   RequestTokenCallback request_token_callback;
   std::string invalidated_token;
   RegisterCallback register_callback;
   int register_call_count_;
   MessageCallback message_callback;
 };

 // Backoff policy for test. Run first 5 retries without delay.
 const net::BackoffEntry::Policy kTestBackoffPolicy = {
   // Number of initial errors (in sequence) to ignore before applying
   // exponential back-off rules.
   5,

   // Initial delay for exponential back-off in ms.
   2000, // 2 seconds.

   // Factor by which the waiting time will be multiplied.
   2,

   // Fuzzing percentage. ex: 10% will spread requests randomly
   // between 90%-100% of the calculated time.
   0.2, // 20%.

   // Maximum amount of time we are willing to delay our request in ms.
   1000 * 3600 * 4, // 4 hours.

   // Time to keep an entry from being discarded even when it
   // has no significant state, -1 to never discard.
   -1,

   // Don't use initial delay unless the last request was an error.
   false,
 };

 class TestGCMNetworkChannel : public GCMNetworkChannel {
  public:
   TestGCMNetworkChannel(
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       scoped_ptr<GCMNetworkChannelDelegate> delegate)
       :  GCMNetworkChannel(request_context_getter, delegate.Pass()) {
     ResetRegisterBackoffEntryForTest(&kTestBackoffPolicy);
   }

  protected:
   // On Android GCMNetworkChannel::BuildUrl hits NOTREACHED(). I still want
   // tests to run.
   virtual GURL BuildUrl(const std::string& registration_id) OVERRIDE {
     return GURL("http://test.url.com");
   }
 };

 class GCMNetworkChannelTest;

 // Test needs to capture setting echo-token header on http request.
 // This class is going to do that.
 class TestNetworkChannelURLFetcher : public net::FakeURLFetcher {
  public:
   TestNetworkChannelURLFetcher(GCMNetworkChannelTest* test,
                                const GURL& url,
                                net::URLFetcherDelegate* delegate,
                                const std::string& response_data,
                                net::HttpStatusCode response_code,
                                net::URLRequestStatus::Status status)
       : net::FakeURLFetcher(url,
                             delegate,
                             response_data,
                             response_code,
                             status),
         test_(test) {}

   virtual void AddExtraRequestHeader(const std::string& header_line) OVERRIDE;

  private:
   GCMNetworkChannelTest* test_;
 };

 class GCMNetworkChannelTest
     : public ::testing::Test,
       public SyncNetworkChannel::Observer {
  public:
   GCMNetworkChannelTest()
       : delegate_(NULL),
         url_fetchers_created_count_(0),
         last_invalidator_state_(TRANSIENT_INVALIDATION_ERROR) {}

   virtual ~GCMNetworkChannelTest() {
   }

   virtual void SetUp() {
     request_context_getter_ = new net::TestURLRequestContextGetter(
         base::MessageLoopProxy::current());
     // Ownership of delegate goes to GCNMentworkChannel but test needs pointer
     // to it.
     delegate_ = new TestGCMNetworkChannelDelegate();
     scoped_ptr<GCMNetworkChannelDelegate> delegate(delegate_);
     gcm_network_channel_.reset(new TestGCMNetworkChannel(
         request_context_getter_,
         delegate.Pass()));
     gcm_network_channel_->AddObserver(this);
     gcm_network_channel_->SetMessageReceiver(
         invalidation::NewPermanentCallback(
             this, &GCMNetworkChannelTest::OnIncomingMessage));
     url_fetcher_factory_.reset(new net::FakeURLFetcherFactory(NULL,
         base::Bind(&GCMNetworkChannelTest::CreateURLFetcher,
             base::Unretained(this))));
   }

   virtual void TearDown() {
     gcm_network_channel_->RemoveObserver(this);
   }

   // Helper functions to call private methods from test
   GURL BuildUrl(const std::string& registration_id) {
     return gcm_network_channel_->GCMNetworkChannel::BuildUrl(registration_id);
   }

   static void Base64EncodeURLSafe(const std::string& input,
                                   std::string* output) {
     GCMNetworkChannel::Base64EncodeURLSafe(input, output);
   }

   static bool Base64DecodeURLSafe(const std::string& input,
                                   std::string* output) {
     return GCMNetworkChannel::Base64DecodeURLSafe(input, output);
   }

   virtual void OnNetworkChannelStateChanged(
       InvalidatorState invalidator_state) OVERRIDE {
     last_invalidator_state_ = invalidator_state;
   }

   void OnIncomingMessage(std::string incoming_message) {
   }

   GCMNetworkChannel* network_channel() {
     return gcm_network_channel_.get();
   }

   TestGCMNetworkChannelDelegate* delegate() {
     return delegate_;
   }

   int url_fetchers_created_count() {
     return url_fetchers_created_count_;
   }

   net::FakeURLFetcherFactory* url_fetcher_factory() {
     return url_fetcher_factory_.get();
   }

   scoped_ptr<net::FakeURLFetcher> CreateURLFetcher(
       const GURL& url,
       net::URLFetcherDelegate* delegate,
       const std::string& response_data,
       net::HttpStatusCode response_code,
       net::URLRequestStatus::Status status) {
     ++url_fetchers_created_count_;
     return scoped_ptr<net::FakeURLFetcher>(new TestNetworkChannelURLFetcher(
         this, url, delegate, response_data, response_code, status));
   }

   void set_last_echo_token(const std::string& echo_token) {
     last_echo_token_ = echo_token;
   }

   const std::string& get_last_echo_token() {
     return last_echo_token_;
   }

   InvalidatorState get_last_invalidator_state() {
     return last_invalidator_state_;
   }

   void RunLoopUntilIdle() {
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
   }

  private:
   base::MessageLoop message_loop_;
   TestGCMNetworkChannelDelegate* delegate_;
   scoped_ptr<GCMNetworkChannel> gcm_network_channel_;
   scoped_refptr<net::TestURLRequestContextGetter> request_context_getter_;
   scoped_ptr<net::FakeURLFetcherFactory> url_fetcher_factory_;
   int url_fetchers_created_count_;
   std::string last_echo_token_;
   InvalidatorState last_invalidator_state_;
 };

 void TestNetworkChannelURLFetcher::AddExtraRequestHeader(
     const std::string& header_line) {
   net::FakeURLFetcher::AddExtraRequestHeader(header_line);
   std::string header_name("echo-token: ");
   std::string echo_token;
   if (StartsWithASCII(header_line, header_name, false)) {
     echo_token = header_line;
     ReplaceFirstSubstringAfterOffset(
         &echo_token, 0, header_name, std::string());
     test_->set_last_echo_token(echo_token);
   }
 }

 TEST_F(GCMNetworkChannelTest, HappyCase) {
   EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
   EXPECT_FALSE(delegate()->message_callback.is_null());
   url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
                                          std::string(),
                                          net::HTTP_NO_CONTENT,
                                          net::URLRequestStatus::SUCCESS);

   // After construction GCMNetworkChannel should have called Register.
   EXPECT_FALSE(delegate()->register_callback.is_null());
   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   network_channel()->SendMessage("abra.cadabra");
   // SendMessage should have triggered RequestToken. No HTTP request should be
   // started yet.
   EXPECT_FALSE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(url_fetchers_created_count(), 0);
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);

   // Return another access token. Message should be cleared by now and shouldn't
   // be sent.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token2");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);
   EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
 }

 TEST_F(GCMNetworkChannelTest, FailedRegister) {
   // After construction GCMNetworkChannel should have called Register.
   EXPECT_FALSE(delegate()->register_callback.is_null());
   EXPECT_EQ(1, delegate()->register_call_count_);
   // Return transient error from Register call.
   delegate()->register_callback.Run("", gcm::GCMClient::NETWORK_ERROR);
   RunLoopUntilIdle();
   // GcmNetworkChannel should have scheduled Register retry.
   EXPECT_EQ(2, delegate()->register_call_count_);
   // Return persistent error from Register call.
   delegate()->register_callback.Run("", gcm::GCMClient::NOT_SIGNED_IN);
   RunLoopUntilIdle();
   // GcmNetworkChannel should give up trying.
   EXPECT_EQ(2, delegate()->register_call_count_);

   network_channel()->SendMessage("abra.cadabra");
   // SendMessage shouldn't trigger RequestToken.
   EXPECT_TRUE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(0, url_fetchers_created_count());
 }

 TEST_F(GCMNetworkChannelTest, RegisterFinishesAfterSendMessage) {
   url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
                                          "",
                                          net::HTTP_NO_CONTENT,
                                          net::URLRequestStatus::SUCCESS);

   // After construction GCMNetworkChannel should have called Register.
   EXPECT_FALSE(delegate()->register_callback.is_null());

   network_channel()->SendMessage("abra.cadabra");
   // SendMessage shouldn't trigger RequestToken.
   EXPECT_TRUE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(url_fetchers_created_count(), 0);

   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   EXPECT_FALSE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(url_fetchers_created_count(), 0);
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);
 }

 TEST_F(GCMNetworkChannelTest, RequestTokenFailure) {
   // After construction GCMNetworkChannel should have called Register.
   EXPECT_FALSE(delegate()->register_callback.is_null());
   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   network_channel()->SendMessage("abra.cadabra");
   // SendMessage should have triggered RequestToken. No HTTP request should be
   // started yet.
   EXPECT_FALSE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(url_fetchers_created_count(), 0);
   // RequestToken returns failure.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::FromConnectionError(1), "");

   // Should be no HTTP requests.
   EXPECT_EQ(url_fetchers_created_count(), 0);
 }

 TEST_F(GCMNetworkChannelTest, AuthErrorFromServer) {
   // Setup fake response to return AUTH_ERROR.
   url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
                                          "",
                                          net::HTTP_UNAUTHORIZED,
                                          net::URLRequestStatus::SUCCESS);

   // After construction GCMNetworkChannel should have called Register.
   EXPECT_FALSE(delegate()->register_callback.is_null());
   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   network_channel()->SendMessage("abra.cadabra");
   // SendMessage should have triggered RequestToken. No HTTP request should be
   // started yet.
   EXPECT_FALSE(delegate()->request_token_callback.is_null());
   EXPECT_EQ(url_fetchers_created_count(), 0);
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);
   EXPECT_EQ(delegate()->invalidated_token, "access.token");
 }

 // Following two tests are to check for memory leaks/crashes when Register and
 // RequestToken don't complete by the teardown.
 TEST_F(GCMNetworkChannelTest, RegisterNeverCompletes) {
   network_channel()->SendMessage("abra.cadabra");
   // Register should be called by now. Let's not complete and see what happens.
   EXPECT_FALSE(delegate()->register_callback.is_null());
 }

 TEST_F(GCMNetworkChannelTest, RequestTokenNeverCompletes) {
   network_channel()->SendMessage("abra.cadabra");
   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);
   // RequestToken should be called by now. Let's not complete and see what
   // happens.
   EXPECT_FALSE(delegate()->request_token_callback.is_null());
 }

 TEST_F(GCMNetworkChannelTest, Base64EncodeDecode) {
   std::string input;
   std::string plain;
   std::string base64;
   // Empty string.
   Base64EncodeURLSafe(input, &base64);
   EXPECT_TRUE(base64.empty());
   EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
   EXPECT_EQ(input, plain);
   // String length: 1..7.
   for (int length = 1; length < 8; length++) {
     input = "abra.cadabra";
     input.resize(length);
     Base64EncodeURLSafe(input, &base64);
     // Ensure no padding at the end.
     EXPECT_NE(base64[base64.size() - 1], '=');
     EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
     EXPECT_EQ(input, plain);
   }
   // Presence of '-', '_'.
   input = "\xfb\xff";
   Base64EncodeURLSafe(input, &base64);
   EXPECT_EQ("-_8", base64);
   EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
   EXPECT_EQ(input, plain);
 }

 TEST_F(GCMNetworkChannelTest, TransientError) {
   EXPECT_FALSE(delegate()->message_callback.is_null());
   // POST will fail.
   url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
                                          std::string(),
                                          net::HTTP_SERVICE_UNAVAILABLE,
                                          net::URLRequestStatus::SUCCESS);

   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   network_channel()->SendMessage("abra.cadabra");
   EXPECT_FALSE(delegate()->request_token_callback.is_null());
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);
   // Failing HTTP POST should cause TRANSIENT_INVALIDATION_ERROR.
   EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
   // Network change to CONNECTION_NONE shouldn't affect invalidator state.
   network_channel()->OnNetworkChanged(
       net::NetworkChangeNotifier::CONNECTION_NONE);
   EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
   // Network change to something else should trigger retry.
   network_channel()->OnNetworkChanged(
       net::NetworkChangeNotifier::CONNECTION_WIFI);
   EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
   network_channel()->OnNetworkChanged(
       net::NetworkChangeNotifier::CONNECTION_NONE);
   EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
 }

 #if !defined(OS_ANDROID)
 TEST_F(GCMNetworkChannelTest, BuildUrl) {
   GURL url = BuildUrl("registration.id");
   EXPECT_TRUE(url.SchemeIsHTTPOrHTTPS());
   EXPECT_FALSE(url.host().empty());
   EXPECT_FALSE(url.path().empty());
   std::vector<std::string> parts;
   Tokenize(url.path(), "/", &parts);
   std::string buffer;
   EXPECT_TRUE(Base64DecodeURLSafe(parts[parts.size() - 1], &buffer));
 }

 TEST_F(GCMNetworkChannelTest, EchoToken) {
   url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
                                          std::string(),
                                          net::HTTP_OK,
                                          net::URLRequestStatus::SUCCESS);
   // After construction GCMNetworkChannel should have called Register.
   // Return valid registration id.
   delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

   network_channel()->SendMessage("abra.cadabra");
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 1);
   EXPECT_TRUE(get_last_echo_token().empty());

   // Trigger response.
   delegate()->message_callback.Run("abra.cadabra", "echo.token");
   // Send another message.
   network_channel()->SendMessage("abra.cadabra");
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 2);
   EXPECT_EQ("echo.token", get_last_echo_token());

   // Trigger response with empty echo token.
   delegate()->message_callback.Run("abra.cadabra", "");
   // Send another message.
   network_channel()->SendMessage("abra.cadabra");
   // Return valid access token. This should trigger HTTP request.
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 3);
   // Echo_token should be from second message.
   EXPECT_EQ("echo.token", get_last_echo_token());
 }
 #endif

 }  // namespace syncer
	// 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/run_loop.h"
	#include "base/strings/string_util.h"
	#include "google_apis/gaia/google_service_auth_error.h"
	#include "net/url_request/test_url_fetcher_factory.h"
	#include "net/url_request/url_request_test_util.h"
	#include "sync/notifier/gcm_network_channel.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace syncer {

	class TestGCMNetworkChannelDelegate : public GCMNetworkChannelDelegate {
	public:
	TestGCMNetworkChannelDelegate()
	: register_call_count_(0) {}

	virtual void Initialize() OVERRIDE {}

	virtual void RequestToken(RequestTokenCallback callback) OVERRIDE {
	request_token_callback = callback;
	}

	virtual void InvalidateToken(const std::string& token) OVERRIDE {
	invalidated_token = token;
	}

	virtual void Register(RegisterCallback callback) OVERRIDE {
	++register_call_count_;
	register_callback = callback;
	}

	virtual void SetMessageReceiver(MessageCallback callback) OVERRIDE {
	message_callback = callback;
	}

	RequestTokenCallback request_token_callback;
	std::string invalidated_token;
	RegisterCallback register_callback;
	int register_call_count_;
	MessageCallback message_callback;
	};

	// Backoff policy for test. Run first 5 retries without delay.
	const net::BackoffEntry::Policy kTestBackoffPolicy = {
	// Number of initial errors (in sequence) to ignore before applying
	// exponential back-off rules.
	5,

	// Initial delay for exponential back-off in ms.
	2000, // 2 seconds.

	// Factor by which the waiting time will be multiplied.
	2,

	// Fuzzing percentage. ex: 10% will spread requests randomly
	// between 90%-100% of the calculated time.
	0.2, // 20%.

	// Maximum amount of time we are willing to delay our request in ms.
	1000 * 3600 * 4, // 4 hours.

	// Time to keep an entry from being discarded even when it
	// has no significant state, -1 to never discard.
	-1,

	// Don't use initial delay unless the last request was an error.
	false,
	};

	class TestGCMNetworkChannel : public GCMNetworkChannel {
	public:
	TestGCMNetworkChannel(
	scoped_refptr<net::URLRequestContextGetter> request_context_getter,
	scoped_ptr<GCMNetworkChannelDelegate> delegate)
	: GCMNetworkChannel(request_context_getter, delegate.Pass()) {
	ResetRegisterBackoffEntryForTest(&kTestBackoffPolicy);
	}

	protected:
	// On Android GCMNetworkChannel::BuildUrl hits NOTREACHED(). I still want
	// tests to run.
	virtual GURL BuildUrl(const std::string& registration_id) OVERRIDE {
	return GURL("http://test.url.com");
	}
	};

	class GCMNetworkChannelTest;

	// Test needs to capture setting echo-token header on http request.
	// This class is going to do that.
	class TestNetworkChannelURLFetcher : public net::FakeURLFetcher {
	public:
	TestNetworkChannelURLFetcher(GCMNetworkChannelTest* test,
	const GURL& url,
	net::URLFetcherDelegate* delegate,
	const std::string& response_data,
	net::HttpStatusCode response_code,
	net::URLRequestStatus::Status status)
	: net::FakeURLFetcher(url,
	delegate,
	response_data,
	response_code,
	status),
	test_(test) {}

	virtual void AddExtraRequestHeader(const std::string& header_line) OVERRIDE;

	private:
	GCMNetworkChannelTest* test_;
	};

	class GCMNetworkChannelTest
	: public ::testing::Test,
	public SyncNetworkChannel::Observer {
	public:
	GCMNetworkChannelTest()
	: delegate_(NULL),
	url_fetchers_created_count_(0),
	last_invalidator_state_(TRANSIENT_INVALIDATION_ERROR) {}

	virtual ~GCMNetworkChannelTest() {
	}

	virtual void SetUp() {
	request_context_getter_ = new net::TestURLRequestContextGetter(
	base::MessageLoopProxy::current());
	// Ownership of delegate goes to GCNMentworkChannel but test needs pointer
	// to it.
	delegate_ = new TestGCMNetworkChannelDelegate();
	scoped_ptr<GCMNetworkChannelDelegate> delegate(delegate_);
	gcm_network_channel_.reset(new TestGCMNetworkChannel(
	request_context_getter_,
	delegate.Pass()));
	gcm_network_channel_->AddObserver(this);
	gcm_network_channel_->SetMessageReceiver(
	invalidation::NewPermanentCallback(
	this, &GCMNetworkChannelTest::OnIncomingMessage));
	url_fetcher_factory_.reset(new net::FakeURLFetcherFactory(NULL,
	base::Bind(&GCMNetworkChannelTest::CreateURLFetcher,
	base::Unretained(this))));
	}

	virtual void TearDown() {
	gcm_network_channel_->RemoveObserver(this);
	}

	// Helper functions to call private methods from test
	GURL BuildUrl(const std::string& registration_id) {
	return gcm_network_channel_->GCMNetworkChannel::BuildUrl(registration_id);
	}

	static void Base64EncodeURLSafe(const std::string& input,
	std::string* output) {
	GCMNetworkChannel::Base64EncodeURLSafe(input, output);
	}

	static bool Base64DecodeURLSafe(const std::string& input,
	std::string* output) {
	return GCMNetworkChannel::Base64DecodeURLSafe(input, output);
	}

	virtual void OnNetworkChannelStateChanged(
	InvalidatorState invalidator_state) OVERRIDE {
	last_invalidator_state_ = invalidator_state;
	}

	void OnIncomingMessage(std::string incoming_message) {
	}

	GCMNetworkChannel* network_channel() {
	return gcm_network_channel_.get();
	}

	TestGCMNetworkChannelDelegate* delegate() {
	return delegate_;
	}

	int url_fetchers_created_count() {
	return url_fetchers_created_count_;
	}

	net::FakeURLFetcherFactory* url_fetcher_factory() {
	return url_fetcher_factory_.get();
	}

	scoped_ptr<net::FakeURLFetcher> CreateURLFetcher(
	const GURL& url,
	net::URLFetcherDelegate* delegate,
	const std::string& response_data,
	net::HttpStatusCode response_code,
	net::URLRequestStatus::Status status) {
	++url_fetchers_created_count_;
	return scoped_ptr<net::FakeURLFetcher>(new TestNetworkChannelURLFetcher(
	this, url, delegate, response_data, response_code, status));
	}

	void set_last_echo_token(const std::string& echo_token) {
	last_echo_token_ = echo_token;
	}

	const std::string& get_last_echo_token() {
	return last_echo_token_;
	}

	InvalidatorState get_last_invalidator_state() {
	return last_invalidator_state_;
	}

	void RunLoopUntilIdle() {
	base::RunLoop run_loop;
	run_loop.RunUntilIdle();
	}

	private:
	base::MessageLoop message_loop_;
	TestGCMNetworkChannelDelegate* delegate_;
	scoped_ptr<GCMNetworkChannel> gcm_network_channel_;
	scoped_refptr<net::TestURLRequestContextGetter> request_context_getter_;
	scoped_ptr<net::FakeURLFetcherFactory> url_fetcher_factory_;
	int url_fetchers_created_count_;
	std::string last_echo_token_;
	InvalidatorState last_invalidator_state_;
	};

	void TestNetworkChannelURLFetcher::AddExtraRequestHeader(
	const std::string& header_line) {
	net::FakeURLFetcher::AddExtraRequestHeader(header_line);
	std::string header_name("echo-token: ");
	std::string echo_token;
	if (StartsWithASCII(header_line, header_name, false)) {
	echo_token = header_line;
	ReplaceFirstSubstringAfterOffset(
	&echo_token, 0, header_name, std::string());
	test_->set_last_echo_token(echo_token);
	}
	}

	TEST_F(GCMNetworkChannelTest, HappyCase) {
	EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
	EXPECT_FALSE(delegate()->message_callback.is_null());
	url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
	std::string(),
	net::HTTP_NO_CONTENT,
	net::URLRequestStatus::SUCCESS);

	// After construction GCMNetworkChannel should have called Register.
	EXPECT_FALSE(delegate()->register_callback.is_null());
	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	network_channel()->SendMessage("abra.cadabra");
	// SendMessage should have triggered RequestToken. No HTTP request should be
	// started yet.
	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(url_fetchers_created_count(), 0);
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);

	// Return another access token. Message should be cleared by now and shouldn't
	// be sent.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token2");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);
	EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
	}

	TEST_F(GCMNetworkChannelTest, FailedRegister) {
	// After construction GCMNetworkChannel should have called Register.
	EXPECT_FALSE(delegate()->register_callback.is_null());
	EXPECT_EQ(1, delegate()->register_call_count_);
	// Return transient error from Register call.
	delegate()->register_callback.Run("", gcm::GCMClient::NETWORK_ERROR);
	RunLoopUntilIdle();
	// GcmNetworkChannel should have scheduled Register retry.
	EXPECT_EQ(2, delegate()->register_call_count_);
	// Return persistent error from Register call.
	delegate()->register_callback.Run("", gcm::GCMClient::NOT_SIGNED_IN);
	RunLoopUntilIdle();
	// GcmNetworkChannel should give up trying.
	EXPECT_EQ(2, delegate()->register_call_count_);

	network_channel()->SendMessage("abra.cadabra");
	// SendMessage shouldn't trigger RequestToken.
	EXPECT_TRUE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(0, url_fetchers_created_count());
	}

	TEST_F(GCMNetworkChannelTest, RegisterFinishesAfterSendMessage) {
	url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
	"",
	net::HTTP_NO_CONTENT,
	net::URLRequestStatus::SUCCESS);

	// After construction GCMNetworkChannel should have called Register.
	EXPECT_FALSE(delegate()->register_callback.is_null());

	network_channel()->SendMessage("abra.cadabra");
	// SendMessage shouldn't trigger RequestToken.
	EXPECT_TRUE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(url_fetchers_created_count(), 0);

	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(url_fetchers_created_count(), 0);
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);
	}

	TEST_F(GCMNetworkChannelTest, RequestTokenFailure) {
	// After construction GCMNetworkChannel should have called Register.
	EXPECT_FALSE(delegate()->register_callback.is_null());
	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	network_channel()->SendMessage("abra.cadabra");
	// SendMessage should have triggered RequestToken. No HTTP request should be
	// started yet.
	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(url_fetchers_created_count(), 0);
	// RequestToken returns failure.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::FromConnectionError(1), "");

	// Should be no HTTP requests.
	EXPECT_EQ(url_fetchers_created_count(), 0);
	}

	TEST_F(GCMNetworkChannelTest, AuthErrorFromServer) {
	// Setup fake response to return AUTH_ERROR.
	url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
	"",
	net::HTTP_UNAUTHORIZED,
	net::URLRequestStatus::SUCCESS);

	// After construction GCMNetworkChannel should have called Register.
	EXPECT_FALSE(delegate()->register_callback.is_null());
	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	network_channel()->SendMessage("abra.cadabra");
	// SendMessage should have triggered RequestToken. No HTTP request should be
	// started yet.
	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	EXPECT_EQ(url_fetchers_created_count(), 0);
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);
	EXPECT_EQ(delegate()->invalidated_token, "access.token");
	}

	// Following two tests are to check for memory leaks/crashes when Register and
	// RequestToken don't complete by the teardown.
	TEST_F(GCMNetworkChannelTest, RegisterNeverCompletes) {
	network_channel()->SendMessage("abra.cadabra");
	// Register should be called by now. Let's not complete and see what happens.
	EXPECT_FALSE(delegate()->register_callback.is_null());
	}

	TEST_F(GCMNetworkChannelTest, RequestTokenNeverCompletes) {
	network_channel()->SendMessage("abra.cadabra");
	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);
	// RequestToken should be called by now. Let's not complete and see what
	// happens.
	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	}

	TEST_F(GCMNetworkChannelTest, Base64EncodeDecode) {
	std::string input;
	std::string plain;
	std::string base64;
	// Empty string.
	Base64EncodeURLSafe(input, &base64);
	EXPECT_TRUE(base64.empty());
	EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
	EXPECT_EQ(input, plain);
	// String length: 1..7.
	for (int length = 1; length < 8; length++) {
	input = "abra.cadabra";
	input.resize(length);
	Base64EncodeURLSafe(input, &base64);
	// Ensure no padding at the end.
	EXPECT_NE(base64[base64.size() - 1], '=');
	EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
	EXPECT_EQ(input, plain);
	}
	// Presence of '-', '_'.
	input = "\xfb\xff";
	Base64EncodeURLSafe(input, &base64);
	EXPECT_EQ("-_8", base64);
	EXPECT_TRUE(Base64DecodeURLSafe(base64, &plain));
	EXPECT_EQ(input, plain);
	}

	TEST_F(GCMNetworkChannelTest, TransientError) {
	EXPECT_FALSE(delegate()->message_callback.is_null());
	// POST will fail.
	url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
	std::string(),
	net::HTTP_SERVICE_UNAVAILABLE,
	net::URLRequestStatus::SUCCESS);

	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	network_channel()->SendMessage("abra.cadabra");
	EXPECT_FALSE(delegate()->request_token_callback.is_null());
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);
	// Failing HTTP POST should cause TRANSIENT_INVALIDATION_ERROR.
	EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
	// Network change to CONNECTION_NONE shouldn't affect invalidator state.
	network_channel()->OnNetworkChanged(
	net::NetworkChangeNotifier::CONNECTION_NONE);
	EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
	// Network change to something else should trigger retry.
	network_channel()->OnNetworkChanged(
	net::NetworkChangeNotifier::CONNECTION_WIFI);
	EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
	network_channel()->OnNetworkChanged(
	net::NetworkChangeNotifier::CONNECTION_NONE);
	EXPECT_EQ(INVALIDATIONS_ENABLED, get_last_invalidator_state());
	}

	#if !defined(OS_ANDROID)
	TEST_F(GCMNetworkChannelTest, BuildUrl) {
	GURL url = BuildUrl("registration.id");
	EXPECT_TRUE(url.SchemeIsHTTPOrHTTPS());
	EXPECT_FALSE(url.host().empty());
	EXPECT_FALSE(url.path().empty());
	std::vector<std::string> parts;
	Tokenize(url.path(), "/", &parts);
	std::string buffer;
	EXPECT_TRUE(Base64DecodeURLSafe(parts[parts.size() - 1], &buffer));
	}

	TEST_F(GCMNetworkChannelTest, EchoToken) {
	url_fetcher_factory()->SetFakeResponse(GURL("http://test.url.com"),
	std::string(),
	net::HTTP_OK,
	net::URLRequestStatus::SUCCESS);
	// After construction GCMNetworkChannel should have called Register.
	// Return valid registration id.
	delegate()->register_callback.Run("registration.id", gcm::GCMClient::SUCCESS);

	network_channel()->SendMessage("abra.cadabra");
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 1);
	EXPECT_TRUE(get_last_echo_token().empty());

	// Trigger response.
	delegate()->message_callback.Run("abra.cadabra", "echo.token");
	// Send another message.
	network_channel()->SendMessage("abra.cadabra");
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 2);
	EXPECT_EQ("echo.token", get_last_echo_token());

	// Trigger response with empty echo token.
	delegate()->message_callback.Run("abra.cadabra", "");
	// Send another message.
	network_channel()->SendMessage("abra.cadabra");
	// Return valid access token. This should trigger HTTP request.
	delegate()->request_token_callback.Run(
	GoogleServiceAuthError::AuthErrorNone(), "access.token");
	RunLoopUntilIdle();
	EXPECT_EQ(url_fetchers_created_count(), 3);
	// Echo_token should be from second message.
	EXPECT_EQ("echo.token", get_last_echo_token());
	}
	#endif

	} // namespace syncer