chromium/chrome/browser/sessions/session_restore_stats_collector_unittest.cc

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/sessions/session_restore_stats_collector.h"

#include <stddef.h>
#include <memory>
#include <utility>
#include <vector>

#include "base/memory/raw_ptr.h"
#include "chrome/test/base/testing_profile.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/test_web_contents_factory.h"
#include "content/public/test/web_contents_tester.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace {

TabLoaderStats;
StatsReportingDelegate;

// A mock StatsReportingDelegate. This is used by the unittests to validate the
// reporting and lifetime behaviour of the SessionRestoreStatsCollector under
// test.
class MockStatsReportingDelegate : public StatsReportingDelegate { … };

// A pass-through stats reporting delegate. This is used to decouple the
// lifetime of the mock reporting delegate from the SessionRestoreStatsCollector
// under test. The SessionRestoreStatsCollector has ownership of this delegate,
// which will notify the mock delegate upon its death.
class PassthroughStatsReportingDelegate : public StatsReportingDelegate { … };

}  // namespace

class SessionRestoreStatsCollectorTest : public testing::Test { … };

TEST_F(SessionRestoreStatsCollectorTest, MultipleTabsLoadSerially) { … }

// Test that if a single restored foreground tab is occluded at any point
// before first paint, the time to first paint is not recorded, and the
// FinishReason is PAINT_FINISHED_UMA_NO_COMPLETELY_VISIBLE_TABS.
TEST_F(SessionRestoreStatsCollectorTest, ForegroundTabOccluded) { … }

// Test that if the first tab painted was hidden/occluded before first paint,
// the first paint time of the second tab to be painted is recorded.
TEST_F(SessionRestoreStatsCollectorTest, FirstOfTwoTabsOccluded) { … }

TEST_F(SessionRestoreStatsCollectorTest, LoadingTabDestroyedBeforePaint) { … }

TEST_F(SessionRestoreStatsCollectorTest, FocusSwitchNoForegroundPaintOrLoad) { … }