services/surfaceflinger/tests/unittests/SchedulerTest.cpp

#undef LOG_TAG
#define LOG_TAG "SchedulerUnittests"

#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <log/log.h>

#include <mutex>

#include "AsyncCallRecorder.h"
#include "Scheduler/DispSync.h"
#include "Scheduler/EventControlThread.h"
#include "Scheduler/EventThread.h"
#include "Scheduler/Scheduler.h"
#include "mock/MockDispSync.h"
#include "mock/MockEventThread.h"

using testing::_;
using testing::Return;

namespace android {

class SchedulerTest : public testing::Test {
protected:
    class MockEventThreadConnection : public BnDisplayEventConnection {
    public:
        MockEventThreadConnection() = default;
        ~MockEventThreadConnection() = default;

        MOCK_METHOD1(stealReceiveChannel, status_t(gui::BitTube* outChannel));
        MOCK_METHOD1(setVsyncRate, status_t(uint32_t count));
        MOCK_METHOD0(requestNextVsync, void());
    };

    /**
     * This mock Scheduler class uses implementation of mock::EventThread but keeps everything else
     * the same.
     */
    class MockScheduler : public android::Scheduler {
    public:
        MockScheduler(std::unique_ptr<EventThread> eventThread)
              : Scheduler([](bool) {}), mEventThread(std::move(eventThread)) {}

        std::unique_ptr<EventThread> makeEventThread(
                const std::string& /* connectionName */, DispSync* /* dispSync */,
                nsecs_t /* phaseOffsetNs */,
                impl::EventThread::ResyncWithRateLimitCallback /* resyncCallback */,
                impl::EventThread::InterceptVSyncsCallback /* interceptCallback */) override {
            return std::move(mEventThread);
        }

        MockScheduler() = default;
        ~MockScheduler() override = default;

        std::unique_ptr<EventThread> mEventThread;
    };

    SchedulerTest();
    ~SchedulerTest() override;

    int64_t calculateMedian(std::vector<int64_t>* v);

    sp<Scheduler::ConnectionHandle> mConnectionHandle;
    mock::DispSync* mPrimaryDispSync = new mock::DispSync();
    mock::EventThread* mEventThread;
    std::unique_ptr<MockScheduler> mScheduler;
    sp<MockEventThreadConnection> mEventThreadConnection;

    AsyncCallRecorder<void (*)()> mResyncCallRecorder;
    AsyncCallRecorder<void (*)(nsecs_t)> mInterceptVSyncCallRecorder;
};

SchedulerTest::SchedulerTest() {
    const ::testing::TestInfo* const test_info =
            ::testing::UnitTest::GetInstance()->current_test_info();
    ALOGD("**** Setting up for %s.%s\n", test_info->test_case_name(), test_info->name());

    std::unique_ptr<mock::EventThread> eventThread = std::make_unique<mock::EventThread>();
    mEventThread = eventThread.get();
    mScheduler = std::make_unique<MockScheduler>(std::move(eventThread));
    mEventThreadConnection = new MockEventThreadConnection();

    // createConnection call to scheduler makes a createEventConnection call to EventThread. Make
    // sure that call gets executed and returns an EventThread::Connection object.
    EXPECT_CALL(*mEventThread, createEventConnection())
            .WillRepeatedly(Return(mEventThreadConnection));

    mConnectionHandle =
            mScheduler->createConnection("appConnection", 16, mResyncCallRecorder.getInvocable(),
                                         mInterceptVSyncCallRecorder.getInvocable());
}

SchedulerTest::~SchedulerTest() {
    const ::testing::TestInfo* const test_info =
            ::testing::UnitTest::GetInstance()->current_test_info();
    ALOGD("**** Tearing down after %s.%s\n", test_info->test_case_name(), test_info->name());
}

int64_t SchedulerTest::calculateMedian(std::vector<int64_t>* v) {
    return mScheduler->calculateMedian(v);
}

namespace {
/* ------------------------------------------------------------------------
 * Test cases
 */
TEST_F(SchedulerTest, canCreateAndDestroyTest) {
    EXPECT_FALSE(mResyncCallRecorder.waitForCall().has_value());
    EXPECT_FALSE(mInterceptVSyncCallRecorder.waitForCall().has_value());
    EXPECT_EQ(0, mConnectionHandle->id);
}

TEST_F(SchedulerTest, testNullPtr) {
    // Passing a null pointer for ConnectionHandle is a valid argument. The code doesn't throw any
    // exceptions, just gracefully continues.
    sp<IDisplayEventConnection> returnedValue;
    ASSERT_NO_FATAL_FAILURE(returnedValue = mScheduler->createDisplayEventConnection(nullptr));
    EXPECT_TRUE(returnedValue == nullptr);
    EXPECT_TRUE(mScheduler->getEventThread(nullptr) == nullptr);
    EXPECT_TRUE(mScheduler->getEventConnection(nullptr) == nullptr);
    ASSERT_NO_FATAL_FAILURE(
            mScheduler->hotplugReceived(nullptr, EventThread::DisplayType::Primary, false));
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenAcquired(nullptr));
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenReleased(nullptr));
    String8 testString;
    ASSERT_NO_FATAL_FAILURE(mScheduler->dump(nullptr, testString));
    EXPECT_TRUE(testString == "");
    ASSERT_NO_FATAL_FAILURE(mScheduler->setPhaseOffset(nullptr, 10));
}

TEST_F(SchedulerTest, invalidConnectionHandle) {
    // Passing an invalid ConnectionHandle is a valid argument. The code doesn't throw any
    // exceptions, just gracefully continues.
    sp<Scheduler::ConnectionHandle> connectionHandle = new Scheduler::ConnectionHandle(20);

    sp<IDisplayEventConnection> returnedValue;
    ASSERT_NO_FATAL_FAILURE(returnedValue =
                                    mScheduler->createDisplayEventConnection(connectionHandle));
    EXPECT_TRUE(returnedValue == nullptr);
    EXPECT_TRUE(mScheduler->getEventThread(connectionHandle) == nullptr);
    EXPECT_TRUE(mScheduler->getEventConnection(connectionHandle) == nullptr);

    // The EXPECT_CALLS make sure we don't call the functions on the subsequent event threads.
    EXPECT_CALL(*mEventThread, onHotplugReceived(_, _)).Times(0);
    ASSERT_NO_FATAL_FAILURE(mScheduler->hotplugReceived(connectionHandle,
                                                        EventThread::DisplayType::Primary, false));

    EXPECT_CALL(*mEventThread, onScreenAcquired()).Times(0);
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenAcquired(connectionHandle));

    EXPECT_CALL(*mEventThread, onScreenReleased()).Times(0);
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenReleased(connectionHandle));

    String8 testString;
    EXPECT_CALL(*mEventThread, dump(_)).Times(0);
    ASSERT_NO_FATAL_FAILURE(mScheduler->dump(connectionHandle, testString));
    EXPECT_TRUE(testString == "");

    EXPECT_CALL(*mEventThread, setPhaseOffset(_)).Times(0);
    ASSERT_NO_FATAL_FAILURE(mScheduler->setPhaseOffset(connectionHandle, 10));
}

TEST_F(SchedulerTest, validConnectionHandle) {
    sp<IDisplayEventConnection> returnedValue;
    ASSERT_NO_FATAL_FAILURE(returnedValue =
                                    mScheduler->createDisplayEventConnection(mConnectionHandle));
    EXPECT_TRUE(returnedValue != nullptr);
    ASSERT_EQ(returnedValue, mEventThreadConnection);

    EXPECT_TRUE(mScheduler->getEventThread(mConnectionHandle) != nullptr);
    EXPECT_TRUE(mScheduler->getEventConnection(mConnectionHandle) != nullptr);

    EXPECT_CALL(*mEventThread, onHotplugReceived(EventThread::DisplayType::Primary, false))
            .Times(1);
    ASSERT_NO_FATAL_FAILURE(mScheduler->hotplugReceived(mConnectionHandle,
                                                        EventThread::DisplayType::Primary, false));

    EXPECT_CALL(*mEventThread, onScreenAcquired()).Times(1);
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenAcquired(mConnectionHandle));

    EXPECT_CALL(*mEventThread, onScreenReleased()).Times(1);
    ASSERT_NO_FATAL_FAILURE(mScheduler->onScreenReleased(mConnectionHandle));

    String8 testString("dump");
    EXPECT_CALL(*mEventThread, dump(testString)).Times(1);
    ASSERT_NO_FATAL_FAILURE(mScheduler->dump(mConnectionHandle, testString));
    EXPECT_TRUE(testString != "");

    EXPECT_CALL(*mEventThread, setPhaseOffset(10)).Times(1);
    ASSERT_NO_FATAL_FAILURE(mScheduler->setPhaseOffset(mConnectionHandle, 10));
}

TEST_F(SchedulerTest, calculateMedian) {
    std::vector<int64_t> testVector;
    // Calling the function on empty vector returns 0.
    EXPECT_EQ(0, calculateMedian(&testVector));

    testVector.push_back(33);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(33);
    testVector.push_back(33);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(42);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(33);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(42);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(42);
    EXPECT_EQ(33, calculateMedian(&testVector));
    testVector.push_back(42);
    EXPECT_EQ(42, calculateMedian(&testVector));
    testVector.push_back(60);
    EXPECT_EQ(42, calculateMedian(&testVector));
    testVector.push_back(60);
    EXPECT_EQ(42, calculateMedian(&testVector));
    testVector.push_back(33);
    EXPECT_EQ(42, calculateMedian(&testVector));
    testVector.push_back(33);
    EXPECT_EQ(42, calculateMedian(&testVector));
    testVector.push_back(33);
    EXPECT_EQ(33, calculateMedian(&testVector));
}

} // namespace
} // namespace android