PageLoadMetrics renderer and browser implementation.

components/page_load_metrics/renderer/metrics_render_frame_observer_unittest.cc

+// Copyright (c) 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/page_load_metrics/renderer/metrics_render_frame_observer.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
+#include "base/timer/mock_timer.h"
+#include "components/page_load_metrics/common/page_load_metrics_messages.h"
+#include "components/page_load_metrics/common/page_load_timing.h"
+#include "ipc/ipc_message_macros.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::NiceMock;
+using testing::Return;
+using testing::StrictMock;
+
+namespace page_load_metrics {
+
+// IPC interceptor class, which we use to verify that certain IPC
+// messages get sent.
+class MockIPCInterceptor {
+ public:
+  void OnMessage(const IPC::Message& message) {
+    IPC_BEGIN_MESSAGE_MAP(MockIPCInterceptor, message)
+      IPC_MESSAGE_HANDLER(PageLoadMetricsMsg_TimingUpdated, OnTimingUpdated)
+      IPC_MESSAGE_UNHANDLED(ADD_FAILURE())
+    IPC_END_MESSAGE_MAP()
+  }
+
+  MOCK_METHOD1(OnTimingUpdated, void(PageLoadTiming));
+};
+
+// Implementation of the MetricsRenderFrameObserver class we're testing,
+// with the GetTiming() and ShouldSendMetrics() methods stubbed out to make
+// the rest of the class more testable.
+class MockMetricsRenderFrameObserver : public MetricsRenderFrameObserver {
+ public:
+  MockMetricsRenderFrameObserver() : MetricsRenderFrameObserver(nullptr) {
+    ON_CALL(*this, ShouldSendMetrics()).WillByDefault(Return(true));
+  }
+
+  scoped_ptr<base::Timer> CreateTimer() const override {
+    if (!mock_timer_)
+      ADD_FAILURE() << "CreateTimer() called, but no MockTimer available.";
+    return mock_timer_.Pass();
+  }
+
+  // We intercept sent messages and dispatch them to a MockIPCInterceptor, which
+  // we use to verify that the expected IPC messages get sent.
+  virtual bool Send(IPC::Message* message) {
+    interceptor_.OnMessage(*message);
+    delete message;
+    return true;
+  }
+
+  void set_mock_timer(scoped_ptr<base::Timer> timer) {
+    ASSERT_EQ(nullptr, mock_timer_);
+    mock_timer_ = timer.Pass();
+  }
+
+  MOCK_CONST_METHOD0(GetTiming, PageLoadTiming());
+  MOCK_CONST_METHOD0(ShouldSendMetrics, bool());
+  MockIPCInterceptor* ipc_interceptor() { return &interceptor_; }
+
+ private:
+  StrictMock<MockIPCInterceptor> interceptor_;
+  mutable scoped_ptr<base::Timer> mock_timer_;
+};
+
+typedef testing::Test MetricsRenderFrameObserverTest;
+
+TEST_F(MetricsRenderFrameObserverTest, NoMetrics) {
+  NiceMock<MockMetricsRenderFrameObserver> observer;
+  base::MockTimer* mock_timer = new base::MockTimer(false, false);
+  observer.set_mock_timer(make_scoped_ptr(mock_timer));
+  observer.DidCommitProvisionalLoad(true, false);
+
+  EXPECT_CALL(observer, GetTiming()).WillRepeatedly(Return(PageLoadTiming()));
+  observer.DidChangePerformanceTiming();
+  ASSERT_FALSE(mock_timer->IsRunning());
+}
+
+TEST_F(MetricsRenderFrameObserverTest, SingleMetric) {
+  base::Time nav_start = base::Time::FromDoubleT(10);
+  base::TimeDelta first_layout = base::TimeDelta::FromMillisecondsD(10);
+
+  NiceMock<MockMetricsRenderFrameObserver> observer;
+  base::MockTimer* mock_timer = new base::MockTimer(false, false);
+  observer.set_mock_timer(make_scoped_ptr(mock_timer));
+  observer.DidCommitProvisionalLoad(true, false);
+
+  PageLoadTiming timing;
+  timing.navigation_start = nav_start;
+  timing.first_layout = first_layout;
+  EXPECT_CALL(observer, GetTiming()).WillRepeatedly(Return(timing));
+
+  EXPECT_CALL(*observer.ipc_interceptor(), OnTimingUpdated(timing));
+
+  observer.DidChangePerformanceTiming();
+  mock_timer->Fire();
+}
+
+TEST_F(MetricsRenderFrameObserverTest, MultipleMetrics) {
+  base::Time nav_start = base::Time::FromDoubleT(10);
+  base::TimeDelta first_layout = base::TimeDelta::FromMillisecondsD(2);
+  base::TimeDelta dom_event = base::TimeDelta::FromMillisecondsD(2);
+  base::TimeDelta load_event = base::TimeDelta::FromMillisecondsD(2);
+
+  NiceMock<MockMetricsRenderFrameObserver> observer;
+  base::MockTimer* mock_timer = new base::MockTimer(false, false);
+  observer.set_mock_timer(make_scoped_ptr(mock_timer));
+  observer.DidCommitProvisionalLoad(true, false);
+
+  PageLoadTiming timing;
+  timing.navigation_start = nav_start;
+  timing.first_layout = first_layout;
+  timing.dom_content_loaded_event_start = dom_event;
+  EXPECT_CALL(observer, GetTiming()).WillRepeatedly(Return(timing));
+
+  EXPECT_CALL(*observer.ipc_interceptor(), OnTimingUpdated(timing));
+  observer.DidChangePerformanceTiming();
+  mock_timer->Fire();
+
+  // At this point, we should have triggered the generation of two metrics.
+  // Verify and reset the observer's expectations before moving on to the next
+  // part of the test.
+  testing::Mock::VerifyAndClearExpectations(observer.ipc_interceptor());
+
+  timing.load_event_start = load_event;
+  EXPECT_CALL(observer, GetTiming()).WillRepeatedly(Return(timing));
+
+  EXPECT_CALL(*observer.ipc_interceptor(), OnTimingUpdated(timing));
+  observer.DidChangePerformanceTiming();
+  mock_timer->Fire();
+
+  // Verify and reset the observer's expectations before moving on to the next
+  // part of the test.
+  testing::Mock::VerifyAndClearExpectations(observer.ipc_interceptor());
+
+  // The PageLoadTiming above includes timing information for the first layout,
+  // dom content, and load metrics. However, since we've already generated
+  // timing information for all of these metrics previously, we do not expect
+  // this invocation to generate any additional metrics.
+  observer.DidChangePerformanceTiming();
+  ASSERT_FALSE(mock_timer->IsRunning());
+}
+
+TEST_F(MetricsRenderFrameObserverTest, MultipleNavigations) {
+  base::Time nav_start = base::Time::FromDoubleT(10);
+  base::TimeDelta first_layout = base::TimeDelta::FromMillisecondsD(2);
+  base::TimeDelta dom_event = base::TimeDelta::FromMillisecondsD(2);
+  base::TimeDelta load_event = base::TimeDelta::FromMillisecondsD(2);
+
+  NiceMock<MockMetricsRenderFrameObserver> observer;
+  base::MockTimer* mock_timer = new base::MockTimer(false, false);
+  observer.set_mock_timer(make_scoped_ptr(mock_timer));
+  observer.DidCommitProvisionalLoad(true, false);
+
+  PageLoadTiming timing;
+  timing.navigation_start = nav_start;
+  timing.first_layout = first_layout;
+  timing.dom_content_loaded_event_start = dom_event;
+  timing.load_event_start = load_event;
+  EXPECT_CALL(observer, GetTiming()).WillRepeatedly(Return(timing));
+  EXPECT_CALL(*observer.ipc_interceptor(), OnTimingUpdated(timing));
+  observer.DidChangePerformanceTiming();
+  mock_timer->Fire();
+
+  // At this point, we should have triggered the generation of two metrics.
+  // Verify and reset the observer's expectations before moving on to the next
+  // part of the test.
+  testing::Mock::VerifyAndClearExpectations(observer.ipc_interceptor());
+
+  base::Time nav_start_2 = base::Time::FromDoubleT(100);
+  base::TimeDelta first_layout_2 = base::TimeDelta::FromMillisecondsD(20);
+  base::TimeDelta dom_event_2 = base::TimeDelta::FromMillisecondsD(20);
+  base::TimeDelta load_event_2 = base::TimeDelta::FromMillisecondsD(20);
+  PageLoadTiming timing_2;
+  timing_2.navigation_start = nav_start_2;
+  timing_2.first_layout = first_layout_2;
+  timing_2.dom_content_loaded_event_start = dom_event_2;
+  timing_2.load_event_start = load_event_2;
+
+  base::MockTimer* mock_timer2 = new base::MockTimer(false, false);
+  observer.set_mock_timer(make_scoped_ptr(mock_timer2));
+  observer.DidCommitProvisionalLoad(true, false);
+  EXPECT_CALL(*observer.ipc_interceptor(), OnTimingUpdated(timing));
+  observer.DidChangePerformanceTiming();
+  mock_timer2->Fire();
+}
+
+}  // namespace page_load_metrics