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// Copyright 2020 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/ui/thumbnails/thumbnail_scheduler_impl.h"
#include <vector>
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
class FakeTabCapturer : public ThumbnailScheduler::TabCapturer {
public:
FakeTabCapturer() = default;
~FakeTabCapturer() override = default;
bool capture_permitted() const { return capture_permitted_; }
// ThumbnailScheduler::TabCapturer:
void SetCapturePermittedByScheduler(bool capture_permitted) override {
capture_permitted_ = capture_permitted;
}
private:
bool capture_permitted_ = false;
};
} // namespace
using ::testing::_;
using ::testing::ElementsAre;
class ThumbnailSchedulerImplTest : public ::testing::Test {
public:
ThumbnailSchedulerImplTest() : scheduler_(2, 1), tabs_(4) {}
~ThumbnailSchedulerImplTest() override = default;
void SetUp() override { AddTabsToScheduler(); }
void TearDown() override { RemoveTabsFromScheduler(); }
protected:
void AddTabsToScheduler() {
for (FakeTabCapturer& tab : tabs_) {
scheduler_.AddTab(&tab);
}
}
void RemoveTabsFromScheduler() {
for (FakeTabCapturer& tab : tabs_) {
scheduler_.RemoveTab(&tab);
}
}
std::vector<bool> TabScheduledStates() {
std::vector<bool> states;
for (const auto& tab : tabs_) {
states.push_back(tab.capture_permitted());
}
return states;
}
ThumbnailSchedulerImpl scheduler_;
std::vector<FakeTabCapturer> tabs_;
};
TEST_F(ThumbnailSchedulerImplTest, TabsNotScheduledIfCaptureNotNeeded) {
// By default, tabs' priorities are kNone. No captures should be
// scheduled.
EXPECT_THAT(TabScheduledStates(), ElementsAre(false, false, false, false));
}
TEST_F(ThumbnailSchedulerImplTest, HighPriorityCapturesScheduledUpToMax) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
// A new capture of the same priority shouldn't preempt an existing
// one. Otherwise there may be too much churn: a tab almost done
// capturing might be descheduled, only to restart capture later.
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
}
TEST_F(ThumbnailSchedulerImplTest, LowPriorityCapturesScheduledUpToMax) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, false, false));
// Similar to the above test, don't preempt.
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, false, false));
}
TEST_F(ThumbnailSchedulerImplTest, HighPriorityCapturesPreemptLowPriority) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
// There should never be a low priority capture running while a high
// priority capture is descheduled. When the high priority tabs
// exceeds the max total captures (2) minus the max low priority
// captures (1), the high priority tabs take precedence.
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(false, true, true, false));
}
TEST_F(ThumbnailSchedulerImplTest, NewTabScheduledWhenCaptureFinished) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[3], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kNone);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, true, false));
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kNone);
EXPECT_THAT(TabScheduledStates(), ElementsAre(false, false, true, true));
}
TEST_F(ThumbnailSchedulerImplTest, PreemptsOnPriorityDowngrade) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, true, false));
}
TEST_F(ThumbnailSchedulerImplTest, PreemptsOnPriorityUpgrade) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[2], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, false, true, false));
}
TEST_F(ThumbnailSchedulerImplTest,
LowPriorityCaptureContinuesOnPriorityUpgrade) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
}
TEST_F(ThumbnailSchedulerImplTest, CaptureStopsOnPriorityNone) {
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kHigh);
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kLow);
EXPECT_THAT(TabScheduledStates(), ElementsAre(true, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[0], ThumbnailSchedulerImpl::TabCapturePriority::kNone);
EXPECT_THAT(TabScheduledStates(), ElementsAre(false, true, false, false));
scheduler_.SetTabCapturePriority(
&tabs_[1], ThumbnailSchedulerImpl::TabCapturePriority::kNone);
EXPECT_THAT(TabScheduledStates(), ElementsAre(false, false, false, false));
}
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