chromium/third_party/blink/common/page/content_to_visible_time_reporter_unittest.cc

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <string>
#include <utility>
#include <vector>

#include "base/containers/contains.h"
#include "base/containers/extend.h"
#include "base/rand_util.h"
#include "base/strings/strcat.h"
#include "base/strings/stringprintf.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/task_environment.h"
#include "components/viz/common/frame_timing_details.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/page/content_to_visible_time_reporter.h"

namespace blink {

constexpr char kBfcacheRestoreHistogram[] = …;

constexpr base::TimeDelta kDuration = …;
constexpr base::TimeDelta kOtherDuration = …;

// Combinations of tab states that log different histogram suffixes.
struct TabStateParams { … };

constexpr TabStateParams kTabStatesToTest[] = …;

class ContentToVisibleTimeReporterTest
    : public ::testing::TestWithParam<TabStateParams> { … };

INSTANTIATE_TEST_SUITE_P(…);

// Time is properly recorded to histogram if we have a proper matching
// TabWasShown and callback execution.
TEST_P(ContentToVisibleTimeReporterTest, TimeIsRecorded) { … }

// An incomplete tab switch is reported when no frame is shown before a tab is
// hidden.
TEST_P(ContentToVisibleTimeReporterTest, HideBeforePresentFrame) { … }

// If TabWasHidden is not called an incomplete tab switch is reported.
// TODO(crbug.com/1289266): Find and remove all cases where TabWasHidden is not
// called.
TEST_P(ContentToVisibleTimeReporterTest, MissingTabWasHidden) { … }

// Time is properly recorded to histogram when we have bfcache restore event.
TEST_P(ContentToVisibleTimeReporterTest, BfcacheRestoreTimeIsRecorded) { … }

// Time is properly recorded to histogram when we have unoccluded event
// and some other events too.
TEST_P(ContentToVisibleTimeReporterTest,
       TimeIsRecordedWithSavedFramesPlusBfcacheRestoreTimeIsRecorded) { … }

}  // namespace blink