Support needed to measure user and service traffic in Chrome.

components/data_use_measurement/content/data_use_measurement_unittest.cc

+// Copyright 2015 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/data_use_measurement/content/data_use_measurement.h"
+
+#include "base/test/histogram_tester.h"
+#include "content/public/browser/resource_request_info.h"
+#include "net/base/network_change_notifier.h"
+#include "net/socket/socket_test_util.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_ANDROID)
+#include "base/android/application_status_listener.h"
+#endif
+
+namespace data_use_measurement {
+
+class DataUseMeasurementTest : public testing::Test {
+ public:
+  DataUseMeasurementTest() : context_(new net::TestURLRequestContext(true)) {
+    context_->set_client_socket_factory(&socket_factory_);
+    context_->set_network_delegate(&test_network_delegate_);
+    context_->Init();
+
+    UpdateConnectionType();
+  }
+
+ protected:

[mmenke, 2015/09/04 20:51:46]

No need for the protected section.

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+  // This function makes one user request and one service request and confirms
+  // that their effect is reflected in proper histograms.
+  void TestForAUserAndAServicePacket(const std::string& target_dimension) {
+    net::MockRead reads[] = {net::MockRead("HTTP/1.1 200 OK\r\n"
+                                           "Content-Length: 12\r\n\r\n"),
+                             net::MockRead("Test Content"),
+                             net::MockRead("HTTP/1.1 200 OK\r\n"
+                                           "Content-Length: 13\r\n\r\n"),
+                             net::MockRead("Test Content2")};

[mmenke, 2015/09/04 20:51:46]

Relying on reusing the socket is really ugly.  I suggest just splitting up the
tests, with one request per test (Could also use the embedded test server, but
that's a bigger change, which I suspect you'd rather not do).

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+
+    net::StaticSocketDataProvider socket_data(reads, arraysize(reads), nullptr,
+                                              0);
+    socket_factory_.AddSocketDataProvider(&socket_data);
+    base::HistogramTester histogram_tester;
+    scoped_ptr<net::URLRequest> request(context_->CreateRequest(
+        GURL("http://foo.com"), net::DEFAULT_PRIORITY, &test_delegate_));
+    request->SetUserData(
+        data_use_measurement::DataUseUserData::kUserDataKey,
+        new data_use_measurement::DataUseUserData(
+            data_use_measurement::DataUseUserData::SUGGESTIONS));
+    request->Start();
+    loop_.Run();
+    data_use_measurement_.ReportDataUseUMA(request.get());
+    histogram_tester.ExpectTotalCount("DataUse.TrafficSize.System.Downstream." +
+                                          target_dimension + connection_type_,
+                                      1);
+    histogram_tester.ExpectTotalCount("DataUse.TrafficSize.System.Upstream." +
+                                          target_dimension + connection_type_,
+                                      1);
+    // One upload and one download message, so total count should be 2.
+    histogram_tester.ExpectTotalCount("DataUse.MessageSize.Suggestions", 2);
+
+    scoped_ptr<net::URLRequest> request2(context_->CreateRequest(

[mmenke, 2015/09/04 20:51:46]

include base/memory/scoped_ptr.h

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+        GURL("http://foo.com"), net::DEFAULT_PRIORITY, &test_delegate_));

[mmenke, 2015/09/04 20:51:46]

include url/gurl.h and net/base/request_priority.h

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+    content::ResourceRequestInfo::AllocateForTesting(
+        request2.get(), content::RESOURCE_TYPE_MAIN_FRAME, nullptr, -2, -2, -2,
+        true, false, true, true);
+    request2->Start();
+    loop_.Run();
+    data_use_measurement_.ReportDataUseUMA(request2.get());
+    histogram_tester.ExpectTotalCount("DataUse.TrafficSize.User.Downstream." +
+                                          target_dimension + connection_type_,
+                                      1);
+    histogram_tester.ExpectTotalCount("DataUse.TrafficSize.User.Upstream." +
+                                          target_dimension + connection_type_,
+                                      1);

[mmenke, 2015/09/04 20:51:46]

Check DataUse.MessageSize.AllServices, too?

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+  }
+
+  void UpdateConnectionType() {
+    if (net::NetworkChangeNotifier::IsConnectionCellular(
+            net::NetworkChangeNotifier::GetConnectionType())) {

[mmenke, 2015/09/04 20:51:46]

This always returns CONNECTION_TYPE_UNKNOWN when we have no network change
notifier, so can get rid of this method.  Note that if we were reading live
values, this test wouldn't be safe, as that can actually change during the
coarse of a test.

Could optionally add a DCHECK on connection type, with a comment, to make the
dependency clearer.

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+      connection_type_ = "Cellular";
+    } else {
+      connection_type_ = "NotCellular";
+    }
+  }
+
+  DataUseMeasurement data_use_measurement_;

[mmenke, 2015/09/04 20:51:46]

This can be private.

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+
+ private:
+  base::MessageLoopForIO loop_;
+  scoped_ptr<net::TestURLRequestContext> context_;
+  net::TestNetworkDelegate test_network_delegate_;
+  net::TestDelegate test_delegate_;

[mmenke, 2015/09/04 20:51:46]

Suggest removing this as a member variable, and just adding it to the stack in
TestForAUserAndAServicePacket.

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+  std::string connection_type_;

[mmenke, 2015/09/04 20:51:46]

include <string>

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+  net::MockClientSocketFactory socket_factory_;

[mmenke, 2015/09/04 20:51:46]

Order these based on dependencies:

socket_factory_
test_network_delegate_
context_

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(DataUseMeasurementTest);
+};
+
+// This test function tests recording of data use information in UMA histogram
+// when packet is originated from user or services.
+// TODO(amohammadkhan): Add tests for Cellular/non-cellular connection types
+// when support for testing is provided in its class.
+TEST_F(DataUseMeasurementTest, UserNotUserTest) {
+#if defined(OS_ANDROID)
+  data_use_measurement_.OnApplicationStateChangeForTesting(
+      base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES);
+#endif
+  UpdateConnectionType();
+  TestForAUserAndAServicePacket("Foreground.");
+}
+
+#if defined(OS_ANDROID)
+TEST_F(DataUseMeasurementTest, ApplicationStateTest) {
+  data_use_measurement_.OnApplicationStateChangeForTesting(
+      base::android::APPLICATION_STATE_HAS_STOPPED_ACTIVITIES);
+  UpdateConnectionType();
+  TestForAUserAndAServicePacket("Background.");
+}
+#endif
+
+}  // namespace data_use_measurement