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// Copyright 2017 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_observer.h"
#include <set>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/resource_coordinator/tab_helper.h"
#include "chrome/browser/resource_coordinator/tab_load_tracker.h"
#include "chrome/browser/resource_coordinator/tab_manager.h"
#include "chrome/browser/sessions/session_restore.h"
#include "chrome/browser/sessions/session_restore_stats_collector.h"
#include "chrome/browser/sessions/tab_loader.h"
#include "chrome/test/base/chrome_render_view_host_test_harness.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/web_contents_tester.h"
using content::WebContentsTester;
using resource_coordinator::TabLoadTracker;
using LoadingState = TabLoadTracker::LoadingState;
namespace {
const char kDefaultUrl[] = "https://www.google.com";
} // namespace
class MockSessionRestoreObserver : public SessionRestoreObserver {
public:
MockSessionRestoreObserver() { SessionRestore::AddObserver(this); }
MockSessionRestoreObserver(const MockSessionRestoreObserver&) = delete;
MockSessionRestoreObserver& operator=(const MockSessionRestoreObserver&) =
delete;
~MockSessionRestoreObserver() { SessionRestore::RemoveObserver(this); }
enum class SessionRestoreEvent {
STARTED_LOADING_TABS,
FINISHED_LOADING_TABS
};
const std::vector<SessionRestoreEvent>& session_restore_events() const {
return session_restore_events_;
}
// SessionRestoreObserver implementation:
void OnSessionRestoreStartedLoadingTabs() override {
session_restore_events_.emplace_back(
SessionRestoreEvent::STARTED_LOADING_TABS);
}
void OnSessionRestoreFinishedLoadingTabs() override {
session_restore_events_.emplace_back(
SessionRestoreEvent::FINISHED_LOADING_TABS);
}
private:
std::vector<SessionRestoreEvent> session_restore_events_;
};
class SessionRestoreObserverTest : public ChromeRenderViewHostTestHarness {
public:
using RestoredTab = SessionRestoreDelegate::RestoredTab;
SessionRestoreObserverTest() = default;
SessionRestoreObserverTest(const SessionRestoreObserverTest&) = delete;
SessionRestoreObserverTest& operator=(const SessionRestoreObserverTest&) =
delete;
// testing::Test:
void SetUp() override {
ChromeRenderViewHostTestHarness::SetUp();
SetContents(CreateRestoredWebContents());
restored_tabs_.emplace_back(web_contents(), false, false, false,
std::nullopt);
}
void TearDown() override {
ChromeRenderViewHostTestHarness::TearDown();
restored_tabs_.clear();
}
protected:
std::unique_ptr<content::WebContents> CreateRestoredWebContents() {
std::unique_ptr<content::WebContents> test_contents(
WebContentsTester::CreateTestWebContents(browser_context(), nullptr));
std::vector<std::unique_ptr<content::NavigationEntry>> entries;
entries.push_back(content::NavigationEntry::Create());
test_contents->GetController().Restore(0, content::RestoreType::kRestored,
&entries);
// TabLoadTracker needs the resource_coordinator WebContentsData to be
// initialized, which is needed by TabLoader.
resource_coordinator::ResourceCoordinatorTabHelper::CreateForWebContents(
test_contents.get());
return test_contents;
}
void RestoreTabs() {
TabLoader::RestoreTabs(restored_tabs_, base::TimeTicks());
}
void LoadWebContents(content::WebContents* contents) {
WebContentsTester::For(contents)->NavigateAndCommit(GURL(kDefaultUrl));
WebContentsTester::For(contents)->TestSetIsLoading(false);
// Transition through LOADING to LOADED in order to keep the
// SessionRestoreStatsCollector state machine happy.
if (TabLoadTracker::Get()->GetLoadingState(contents) !=
LoadingState::LOADING) {
TabLoadTracker::Get()->TransitionStateForTesting(contents,
LoadingState::LOADING);
}
TabLoadTracker::Get()->TransitionStateForTesting(contents,
LoadingState::LOADED);
}
const std::vector<MockSessionRestoreObserver::SessionRestoreEvent>&
session_restore_events() const {
return mock_observer_.session_restore_events();
}
size_t number_of_session_restore_events() const {
return session_restore_events().size();
}
private:
MockSessionRestoreObserver mock_observer_;
std::vector<RestoredTab> restored_tabs_;
};
TEST_F(SessionRestoreObserverTest, SingleSessionRestore) {
SessionRestore::NotifySessionRestoreStartedLoadingTabs();
RestoreTabs();
ASSERT_EQ(1u, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::STARTED_LOADING_TABS,
session_restore_events()[0]);
LoadWebContents(web_contents());
ASSERT_EQ(2u, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::FINISHED_LOADING_TABS,
session_restore_events()[1]);
}
TEST_F(SessionRestoreObserverTest, SequentialSessionRestores) {
const size_t number_of_session_restores = 3;
size_t event_index = 0;
std::vector<std::unique_ptr<content::WebContents>> different_test_contents;
for (size_t i = 0; i < number_of_session_restores; ++i) {
different_test_contents.emplace_back(CreateRestoredWebContents());
content::WebContents* test_contents = different_test_contents.back().get();
std::vector<RestoredTab> restored_tabs{
RestoredTab(test_contents, false, false, false, std::nullopt)};
SessionRestore::NotifySessionRestoreStartedLoadingTabs();
TabLoader::RestoreTabs(restored_tabs, base::TimeTicks());
ASSERT_EQ(event_index + 1, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::STARTED_LOADING_TABS,
session_restore_events()[event_index++]);
LoadWebContents(test_contents);
ASSERT_EQ(event_index + 1, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::FINISHED_LOADING_TABS,
session_restore_events()[event_index++]);
}
}
TEST_F(SessionRestoreObserverTest, ConcurrentSessionRestores) {
std::vector<RestoredTab> another_restored_tabs;
auto test_contents = CreateRestoredWebContents();
another_restored_tabs.emplace_back(test_contents.get(), false, false, false,
std::nullopt);
SessionRestore::NotifySessionRestoreStartedLoadingTabs();
RestoreTabs();
TabLoader::RestoreTabs(another_restored_tabs, base::TimeTicks());
ASSERT_EQ(1u, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::STARTED_LOADING_TABS,
session_restore_events()[0]);
LoadWebContents(web_contents());
LoadWebContents(test_contents.get());
ASSERT_EQ(2u, number_of_session_restore_events());
EXPECT_EQ(
MockSessionRestoreObserver::SessionRestoreEvent::FINISHED_LOADING_TABS,
session_restore_events()[1]);
}
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