test/watchdog.cpp - openbmc/phosphor-watchdog - Gitiles

 #include "watchdog.hpp"

 #include <chrono>
 #include <memory>
 #include <sdbusplus/bus.hpp>
 #include <sdeventplus/event.hpp>
 #include <thread>
 #include <utility>

 #include <gtest/gtest.h>

 namespace phosphor
 {
 namespace watchdog
 {

 using namespace std::chrono;
 using namespace std::chrono_literals;

 constexpr auto TEST_MIN_INTERVAL = duration<uint64_t, std::deci>(2);

 // Test Watchdog functionality
 class WdogTest : public ::testing::Test
 {
   public:
     // The unit time used to measure the timer
     // This should be large enough to accomodate drift
     using Quantum = duration<uint64_t, std::deci>;

     // Gets called as part of each TEST_F construction
     WdogTest() :
         event(sdeventplus::Event::get_default()),
         bus(sdbusplus::bus::new_default()),
         wdog(std::make_unique<Watchdog>(
             bus, TEST_PATH, event, Watchdog::ActionTargetMap(), std::nullopt,
             milliseconds(TEST_MIN_INTERVAL).count())),

         defaultInterval(Quantum(3))

     {
         wdog->interval(milliseconds(defaultInterval).count());
         // Initially the watchdog would be disabled
         EXPECT_FALSE(wdog->enabled());
     }

     // sdevent Event handle
     sdeventplus::Event event;

     // sdbusplus handle
     sdbusplus::bus::bus bus;

     // Watchdog object
     std::unique_ptr<Watchdog> wdog;

     // This is the default interval as given in Interface definition
     Quantum defaultInterval;

   protected:
     // Dummy name for object path
     // This is just to satisfy the constructor. Does not have
     // a need to check if the objects paths have been created.
     static constexpr auto TEST_PATH = "/test/path";

     // Returns how long it took for the current watchdog timer to be
     // disabled or have its timeRemaining reset.
     Quantum waitForWatchdog(Quantum timeLimit)
     {
         auto previousTimeRemaining = wdog->timeRemaining();
         auto ret = Quantum(0);
         while (ret < timeLimit &&
                previousTimeRemaining >= wdog->timeRemaining() &&
                wdog->timerEnabled())
         {
             previousTimeRemaining = wdog->timeRemaining();

             constexpr auto sleepTime = Quantum(1);
             if (event.run(sleepTime) == 0)
             {
                 ret += sleepTime;
             }
         }

         return ret;
     }
 };

 /** @brief Make sure that watchdog is started and not enabled */
 TEST_F(WdogTest, createWdogAndDontEnable)
 {
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());

     // We should be able to configure persistent properties
     // while disabled
     auto newAction = Watchdog::Action::PowerOff;
     EXPECT_EQ(newAction, wdog->expireAction(newAction));
     auto newIntervalMs = milliseconds(defaultInterval * 2).count();
     EXPECT_EQ(newIntervalMs, wdog->interval(newIntervalMs));

     EXPECT_EQ(newAction, wdog->expireAction());
     EXPECT_EQ(newIntervalMs, wdog->interval());

     // We won't be able to configure timeRemaining
     EXPECT_EQ(0, wdog->timeRemaining(1000));
     EXPECT_EQ(0, wdog->timeRemaining());

     // Timer should not have become enabled
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());
 }

 /** @brief Make sure that watchdog is started and enabled */
 TEST_F(WdogTest, createWdogAndEnable)
 {
     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Get the configured interval
     auto remaining = milliseconds(wdog->timeRemaining());

     // Its possible that we are off by few msecs depending on
     // how we get scheduled. So checking a range here.
     EXPECT_TRUE((remaining >= defaultInterval - Quantum(1)) &&
                 (remaining <= defaultInterval));

     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Make sure that watchdog is started and enabled.
  *         Later, disable watchdog
  */
 TEST_F(WdogTest, createWdogAndEnableThenDisable)
 {
     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Disable and then verify
     EXPECT_FALSE(wdog->enabled(false));
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());
 }

 /** @brief Make sure that watchdog is started and enabled.
  *         Wait for 5 quantums and make sure that the remaining
  *         time shows 5 fewer quantums.
  */
 TEST_F(WdogTest, enableWdogAndWait5Quantums)
 {
     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Sleep for 5 quantums
     auto sleepTime = Quantum(2);
     ASSERT_LT(sleepTime, defaultInterval);
     std::this_thread::sleep_for(sleepTime);

     // Get the remaining time again and expectation is that we get fewer
     auto remaining = milliseconds(wdog->timeRemaining());
     auto expected = defaultInterval - sleepTime;

     // Its possible that we are off by few msecs depending on
     // how we get scheduled. So checking a range here.
     EXPECT_TRUE((remaining >= expected - Quantum(1)) &&
                 (remaining <= expected));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Make sure that watchdog is started and enabled.
  *         Wait 1 quantum and then reset the timer to 5 quantums
  *         and then expect the watchdog to expire in 5 quantums
  */
 TEST_F(WdogTest, enableWdogAndResetTo5Quantums)
 {
     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Sleep for 1 second
     std::this_thread::sleep_for(Quantum(1));

     // Timer should still be running unexpired
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Next timer will expire in 5 quantums from now.
     auto expireTime = Quantum(5);
     auto expireTimeMs = milliseconds(expireTime).count();
     EXPECT_EQ(expireTimeMs, wdog->timeRemaining(expireTimeMs));

     // Waiting for expiration
     EXPECT_EQ(expireTime - Quantum(1), waitForWatchdog(expireTime));
     EXPECT_TRUE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());
 }

 /** @brief Make sure the Interval can be updated directly.
  */
 TEST_F(WdogTest, verifyIntervalUpdateReceived)
 {
     auto expireTime = Quantum(5);
     auto expireTimeMs = milliseconds(expireTime).count();
     EXPECT_EQ(expireTimeMs, wdog->interval(expireTimeMs));

     // Expect an update in the Interval
     EXPECT_EQ(expireTimeMs, wdog->interval());
 }

 /** @brief Make sure the Interval can be updated while the timer is running.
  */
 TEST_F(WdogTest, verifyIntervalUpdateRunning)
 {
     const auto oldInterval = milliseconds(wdog->interval());
     const auto newInterval = 5s;

     EXPECT_TRUE(wdog->enabled(true));
     auto remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(oldInterval, remaining);
     EXPECT_LE(oldInterval - Quantum(1), remaining);
     EXPECT_EQ(newInterval,
               milliseconds(wdog->interval(milliseconds(newInterval).count())));

     // Expect only the interval to update
     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(oldInterval, remaining);
     EXPECT_LE(oldInterval - Quantum(1), remaining);
     EXPECT_EQ(newInterval, milliseconds(wdog->interval()));

     // Expect reset to use the new interval
     wdog->resetTimeRemaining(false);
     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(newInterval, remaining);
     EXPECT_LE(newInterval - Quantum(1), remaining);
 }

 /** @brief Make sure that watchdog is started and enabled.
  *         Wait default interval quantums and make sure that wdog has died
  */
 TEST_F(WdogTest, enableWdogAndWaitTillEnd)
 {
     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Waiting default expiration
     EXPECT_EQ(defaultInterval - Quantum(1), waitForWatchdog(defaultInterval));

     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_TRUE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());
 }

 /** @brief Make sure the watchdog is started and enabled with a fallback
  *         Wait through the initial trip and ensure the fallback is observed
  *         Make sure that fallback runs to completion and ensure the watchdog
  *         is disabled
  */
 TEST_F(WdogTest, enableWdogWithFallbackTillEnd)
 {
     auto primaryInterval = Quantum(5);
     auto primaryIntervalMs = milliseconds(primaryInterval).count();
     auto fallbackInterval = primaryInterval * 2;
     auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

     // We need to make a wdog with the right fallback options
     // The interval is set to be noticeably different from the default
     // so we can always tell the difference
     Watchdog::Fallback fallback;
     fallback.action = Watchdog::Action::PowerOff;
     fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
     fallback.always = false;
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
                                       Watchdog::ActionTargetMap(),
                                       std::move(fallback));
     EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());

     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Waiting default expiration
     EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

     // We should now have entered the fallback once the primary expires
     EXPECT_FALSE(wdog->enabled());
     auto remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // We should still be ticking in fallback when setting action or interval
     auto newInterval = primaryInterval - Quantum(1);
     auto newIntervalMs = milliseconds(newInterval).count();
     EXPECT_EQ(newInterval, milliseconds(wdog->interval(newIntervalMs)));
     EXPECT_EQ(Watchdog::Action::None,
               wdog->expireAction(Watchdog::Action::None));

     EXPECT_FALSE(wdog->enabled());
     EXPECT_GE(remaining, milliseconds(wdog->timeRemaining()));
     EXPECT_LT(primaryInterval, milliseconds(wdog->timeRemaining()));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Test that setting the timeRemaining always resets the timer to the
     // fallback interval
     EXPECT_EQ(fallback.interval, wdog->timeRemaining(primaryInterval.count()));
     EXPECT_FALSE(wdog->enabled());

     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LE(fallbackInterval - Quantum(1), remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Waiting fallback expiration
     EXPECT_EQ(fallbackInterval - Quantum(1), waitForWatchdog(fallbackInterval));

     // We should now have disabled the watchdog after the fallback expires
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_TRUE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());

     // Make sure enabling the watchdog again works
     EXPECT_TRUE(wdog->enabled(true));

     // We should have re-entered the primary
     EXPECT_TRUE(wdog->enabled());
     EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Make sure the watchdog is started and enabled with a fallback
  *         Wait through the initial trip and ensure the fallback is observed
  *         Make sure that we can re-enable the watchdog during fallback
  */
 TEST_F(WdogTest, enableWdogWithFallbackReEnable)
 {
     auto primaryInterval = Quantum(5);
     auto primaryIntervalMs = milliseconds(primaryInterval).count();
     auto fallbackInterval = primaryInterval * 2;
     auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

     // We need to make a wdog with the right fallback options
     // The interval is set to be noticeably different from the default
     // so we can always tell the difference
     Watchdog::Fallback fallback;
     fallback.action = Watchdog::Action::PowerOff;
     fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
     fallback.always = false;
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
                                       Watchdog::ActionTargetMap(),
                                       std::move(fallback));
     EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());

     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Waiting default expiration
     EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

     // We should now have entered the fallback once the primary expires
     EXPECT_FALSE(wdog->enabled());
     auto remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     EXPECT_TRUE(wdog->enabled(true));

     // We should have re-entered the primary
     EXPECT_TRUE(wdog->enabled());
     EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Make sure the watchdog is started and enabled with a fallback
  *         Wait through the initial trip and ensure the fallback is observed
  *         Make sure that changing the primary interval and calling reset timer
  *         will enable the primary watchdog with primary interval.
  */
 TEST_F(WdogTest, enableWdogWithFallbackResetTimerEnable)
 {
     auto primaryInterval = Quantum(5);
     auto primaryIntervalMs = milliseconds(primaryInterval).count();
     auto fallbackInterval = primaryInterval * 2;
     auto fallbackIntervalMs = milliseconds(fallbackInterval).count();
     auto newInterval = fallbackInterval * 2;
     auto newIntervalMs = milliseconds(newInterval).count();

     // We need to make a wdog with the right fallback options
     // The interval is set to be noticeably different from the default
     // so we can always tell the difference
     Watchdog::Fallback fallback;
     fallback.action = Watchdog::Action::PowerOff;
     fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
     fallback.always = false;
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
                                       Watchdog::ActionTargetMap(),
                                       std::move(fallback));
     EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
     EXPECT_FALSE(wdog->enabled());
     EXPECT_EQ(0, wdog->timeRemaining());
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_FALSE(wdog->timerEnabled());

     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));

     // Waiting default expiration
     EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

     // We should now have entered the fallback once the primary expires
     EXPECT_FALSE(wdog->enabled());
     auto remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Setting the interval should take effect once resetTimer re-enables wdog
     EXPECT_EQ(newIntervalMs, wdog->interval(newIntervalMs));
     wdog->resetTimeRemaining(true);

     // We should have re-entered the primary
     EXPECT_TRUE(wdog->enabled());
     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(newInterval, remaining);
     EXPECT_LE(newInterval - Quantum(1), remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Make sure the watchdog is started and with a fallback without
  *         sending an enable
  *         Then enable the watchdog
  *         Wait through the initial trip and ensure the fallback is observed
  *         Make sure that fallback runs to completion and ensure the watchdog
  *         is in the fallback state again
  */
 TEST_F(WdogTest, enableWdogWithFallbackAlways)
 {
     auto primaryInterval = Quantum(5);
     auto primaryIntervalMs = milliseconds(primaryInterval).count();
     auto fallbackInterval = primaryInterval * 2;
     auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

     // We need to make a wdog with the right fallback options
     // The interval is set to be noticeably different from the default
     // so we can always tell the difference
     Watchdog::Fallback fallback;
     fallback.action = Watchdog::Action::PowerOff;
     fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
     fallback.always = true;
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
                                       Watchdog::ActionTargetMap(), fallback,
                                       milliseconds(TEST_MIN_INTERVAL).count());

     // Make sure defualt interval is biggger than min interval
     EXPECT_LT(milliseconds((TEST_MIN_INTERVAL).count()),
               milliseconds(wdog->interval()));

     EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
     EXPECT_FALSE(wdog->enabled());
     auto remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));
     EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));

     // Waiting default expiration
     EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

     // We should now have entered the fallback once the primary expires
     EXPECT_FALSE(wdog->enabled());
     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Waiting fallback expiration
     EXPECT_EQ(fallbackInterval - Quantum(1), waitForWatchdog(fallbackInterval));

     // We should now enter the fallback again
     EXPECT_FALSE(wdog->enabled());
     remaining = milliseconds(wdog->timeRemaining());
     EXPECT_GE(fallbackInterval, remaining);
     EXPECT_LT(primaryInterval, remaining);
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 /** @brief Test minimal interval
  *  The minimal interval was set 2 seconds
  *  Test that when setting interval to 1s , it is still returning 2s
  */
 TEST_F(WdogTest, verifyMinIntervalSetting)
 {
     auto newInterval = Quantum(1);
     auto newIntervalMs = milliseconds(newInterval).count();
     auto minIntervalMs = milliseconds(TEST_MIN_INTERVAL).count();

     // Check first that the current interval is greater than minInterval
     EXPECT_LT(minIntervalMs, wdog->interval());
     // Check that the interval was not set to smaller value than minInterval
     EXPECT_EQ(minIntervalMs, wdog->interval(newIntervalMs));
     // Check that the interval was not set to smaller value than minInterval
     EXPECT_EQ(minIntervalMs, wdog->interval());
 }

 /** @brief Test minimal interval
  *  Initiate default Watchdog in order to get the default
  *  interval.
  *  Initiate watchdog with minInterval greater than default
  *  interval, and make sure the default interval was set to the
  *  minInterval.
  */
 TEST_F(WdogTest, verifyConstructorMinIntervalSetting)
 {
     // Initiate default Watchdog and get the default interval value.
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event);
     auto defaultIntervalMs = wdog->interval();
     auto defaultInterval = milliseconds(defaultIntervalMs);
     auto minInterval = defaultInterval + Quantum(30);
     auto minIntervalMs = milliseconds(minInterval).count();

     // We initiate a new Watchdog with min interval greater than the default
     // intrval
     wdog.reset();
     wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
                                       Watchdog::ActionTargetMap(), std::nullopt,
                                       minIntervalMs);
     // Check that the interval was set to the minInterval
     EXPECT_EQ(minIntervalMs, wdog->interval());

     // Enable and then verify
     EXPECT_TRUE(wdog->enabled(true));
     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());

     // Set remaining time shorter than minInterval will actually set it to
     // minInterval
     auto remaining = milliseconds(wdog->timeRemaining(defaultIntervalMs));

     // Its possible that we are off by few msecs depending on
     // how we get scheduled. So checking a range here.
     EXPECT_TRUE((remaining >= minInterval - Quantum(1)) &&
                 (remaining <= minInterval));

     EXPECT_FALSE(wdog->timerExpired());
     EXPECT_TRUE(wdog->timerEnabled());
 }

 } // namespace watchdog
 } // namespace phosphor
	#include "watchdog.hpp"

	#include <chrono>
	#include <memory>
	#include <sdbusplus/bus.hpp>
	#include <sdeventplus/event.hpp>
	#include <thread>
	#include <utility>

	#include <gtest/gtest.h>

	namespace phosphor
	{
	namespace watchdog
	{

	using namespace std::chrono;
	using namespace std::chrono_literals;

	constexpr auto TEST_MIN_INTERVAL = duration<uint64_t, std::deci>(2);

	// Test Watchdog functionality
	class WdogTest : public ::testing::Test
	{
	public:
	// The unit time used to measure the timer
	// This should be large enough to accomodate drift
	using Quantum = duration<uint64_t, std::deci>;

	// Gets called as part of each TEST_F construction
	WdogTest() :
	event(sdeventplus::Event::get_default()),
	bus(sdbusplus::bus::new_default()),
	wdog(std::make_unique<Watchdog>(
	bus, TEST_PATH, event, Watchdog::ActionTargetMap(), std::nullopt,
	milliseconds(TEST_MIN_INTERVAL).count())),

	defaultInterval(Quantum(3))

	{
	wdog->interval(milliseconds(defaultInterval).count());
	// Initially the watchdog would be disabled
	EXPECT_FALSE(wdog->enabled());
	}

	// sdevent Event handle
	sdeventplus::Event event;

	// sdbusplus handle
	sdbusplus::bus::bus bus;

	// Watchdog object
	std::unique_ptr<Watchdog> wdog;

	// This is the default interval as given in Interface definition
	Quantum defaultInterval;

	protected:
	// Dummy name for object path
	// This is just to satisfy the constructor. Does not have
	// a need to check if the objects paths have been created.
	static constexpr auto TEST_PATH = "/test/path";

	// Returns how long it took for the current watchdog timer to be
	// disabled or have its timeRemaining reset.
	Quantum waitForWatchdog(Quantum timeLimit)
	{
	auto previousTimeRemaining = wdog->timeRemaining();
	auto ret = Quantum(0);
	while (ret < timeLimit &&
	previousTimeRemaining >= wdog->timeRemaining() &&
	wdog->timerEnabled())
	{
	previousTimeRemaining = wdog->timeRemaining();

	constexpr auto sleepTime = Quantum(1);
	if (event.run(sleepTime) == 0)
	{
	ret += sleepTime;
	}
	}

	return ret;
	}
	};

	/** @brief Make sure that watchdog is started and not enabled */
	TEST_F(WdogTest, createWdogAndDontEnable)
	{
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());

	// We should be able to configure persistent properties
	// while disabled
	auto newAction = Watchdog::Action::PowerOff;
	EXPECT_EQ(newAction, wdog->expireAction(newAction));
	auto newIntervalMs = milliseconds(defaultInterval * 2).count();
	EXPECT_EQ(newIntervalMs, wdog->interval(newIntervalMs));

	EXPECT_EQ(newAction, wdog->expireAction());
	EXPECT_EQ(newIntervalMs, wdog->interval());

	// We won't be able to configure timeRemaining
	EXPECT_EQ(0, wdog->timeRemaining(1000));
	EXPECT_EQ(0, wdog->timeRemaining());

	// Timer should not have become enabled
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());
	}

	/** @brief Make sure that watchdog is started and enabled */
	TEST_F(WdogTest, createWdogAndEnable)
	{
	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Get the configured interval
	auto remaining = milliseconds(wdog->timeRemaining());

	// Its possible that we are off by few msecs depending on
	// how we get scheduled. So checking a range here.
	EXPECT_TRUE((remaining >= defaultInterval - Quantum(1)) &&
	(remaining <= defaultInterval));

	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Make sure that watchdog is started and enabled.
	* Later, disable watchdog
	*/
	TEST_F(WdogTest, createWdogAndEnableThenDisable)
	{
	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Disable and then verify
	EXPECT_FALSE(wdog->enabled(false));
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());
	}

	/** @brief Make sure that watchdog is started and enabled.
	* Wait for 5 quantums and make sure that the remaining
	* time shows 5 fewer quantums.
	*/
	TEST_F(WdogTest, enableWdogAndWait5Quantums)
	{
	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Sleep for 5 quantums
	auto sleepTime = Quantum(2);
	ASSERT_LT(sleepTime, defaultInterval);
	std::this_thread::sleep_for(sleepTime);

	// Get the remaining time again and expectation is that we get fewer
	auto remaining = milliseconds(wdog->timeRemaining());
	auto expected = defaultInterval - sleepTime;

	// Its possible that we are off by few msecs depending on
	// how we get scheduled. So checking a range here.
	EXPECT_TRUE((remaining >= expected - Quantum(1)) &&
	(remaining <= expected));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Make sure that watchdog is started and enabled.
	* Wait 1 quantum and then reset the timer to 5 quantums
	* and then expect the watchdog to expire in 5 quantums
	*/
	TEST_F(WdogTest, enableWdogAndResetTo5Quantums)
	{
	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Sleep for 1 second
	std::this_thread::sleep_for(Quantum(1));

	// Timer should still be running unexpired
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Next timer will expire in 5 quantums from now.
	auto expireTime = Quantum(5);
	auto expireTimeMs = milliseconds(expireTime).count();
	EXPECT_EQ(expireTimeMs, wdog->timeRemaining(expireTimeMs));

	// Waiting for expiration
	EXPECT_EQ(expireTime - Quantum(1), waitForWatchdog(expireTime));
	EXPECT_TRUE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());
	}

	/** @brief Make sure the Interval can be updated directly.
	*/
	TEST_F(WdogTest, verifyIntervalUpdateReceived)
	{
	auto expireTime = Quantum(5);
	auto expireTimeMs = milliseconds(expireTime).count();
	EXPECT_EQ(expireTimeMs, wdog->interval(expireTimeMs));

	// Expect an update in the Interval
	EXPECT_EQ(expireTimeMs, wdog->interval());
	}

	/** @brief Make sure the Interval can be updated while the timer is running.
	*/
	TEST_F(WdogTest, verifyIntervalUpdateRunning)
	{
	const auto oldInterval = milliseconds(wdog->interval());
	const auto newInterval = 5s;

	EXPECT_TRUE(wdog->enabled(true));
	auto remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(oldInterval, remaining);
	EXPECT_LE(oldInterval - Quantum(1), remaining);
	EXPECT_EQ(newInterval,
	milliseconds(wdog->interval(milliseconds(newInterval).count())));

	// Expect only the interval to update
	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(oldInterval, remaining);
	EXPECT_LE(oldInterval - Quantum(1), remaining);
	EXPECT_EQ(newInterval, milliseconds(wdog->interval()));

	// Expect reset to use the new interval
	wdog->resetTimeRemaining(false);
	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(newInterval, remaining);
	EXPECT_LE(newInterval - Quantum(1), remaining);
	}

	/** @brief Make sure that watchdog is started and enabled.
	* Wait default interval quantums and make sure that wdog has died
	*/
	TEST_F(WdogTest, enableWdogAndWaitTillEnd)
	{
	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Waiting default expiration
	EXPECT_EQ(defaultInterval - Quantum(1), waitForWatchdog(defaultInterval));

	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_TRUE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());
	}

	/** @brief Make sure the watchdog is started and enabled with a fallback
	* Wait through the initial trip and ensure the fallback is observed
	* Make sure that fallback runs to completion and ensure the watchdog
	* is disabled
	*/
	TEST_F(WdogTest, enableWdogWithFallbackTillEnd)
	{
	auto primaryInterval = Quantum(5);
	auto primaryIntervalMs = milliseconds(primaryInterval).count();
	auto fallbackInterval = primaryInterval * 2;
	auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

	// We need to make a wdog with the right fallback options
	// The interval is set to be noticeably different from the default
	// so we can always tell the difference
	Watchdog::Fallback fallback;
	fallback.action = Watchdog::Action::PowerOff;
	fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
	fallback.always = false;
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
	Watchdog::ActionTargetMap(),
	std::move(fallback));
	EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());

	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Waiting default expiration
	EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

	// We should now have entered the fallback once the primary expires
	EXPECT_FALSE(wdog->enabled());
	auto remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// We should still be ticking in fallback when setting action or interval
	auto newInterval = primaryInterval - Quantum(1);
	auto newIntervalMs = milliseconds(newInterval).count();
	EXPECT_EQ(newInterval, milliseconds(wdog->interval(newIntervalMs)));
	EXPECT_EQ(Watchdog::Action::None,
	wdog->expireAction(Watchdog::Action::None));

	EXPECT_FALSE(wdog->enabled());
	EXPECT_GE(remaining, milliseconds(wdog->timeRemaining()));
	EXPECT_LT(primaryInterval, milliseconds(wdog->timeRemaining()));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Test that setting the timeRemaining always resets the timer to the
	// fallback interval
	EXPECT_EQ(fallback.interval, wdog->timeRemaining(primaryInterval.count()));
	EXPECT_FALSE(wdog->enabled());

	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LE(fallbackInterval - Quantum(1), remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Waiting fallback expiration
	EXPECT_EQ(fallbackInterval - Quantum(1), waitForWatchdog(fallbackInterval));

	// We should now have disabled the watchdog after the fallback expires
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_TRUE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());

	// Make sure enabling the watchdog again works
	EXPECT_TRUE(wdog->enabled(true));

	// We should have re-entered the primary
	EXPECT_TRUE(wdog->enabled());
	EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Make sure the watchdog is started and enabled with a fallback
	* Wait through the initial trip and ensure the fallback is observed
	* Make sure that we can re-enable the watchdog during fallback
	*/
	TEST_F(WdogTest, enableWdogWithFallbackReEnable)
	{
	auto primaryInterval = Quantum(5);
	auto primaryIntervalMs = milliseconds(primaryInterval).count();
	auto fallbackInterval = primaryInterval * 2;
	auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

	// We need to make a wdog with the right fallback options
	// The interval is set to be noticeably different from the default
	// so we can always tell the difference
	Watchdog::Fallback fallback;
	fallback.action = Watchdog::Action::PowerOff;
	fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
	fallback.always = false;
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
	Watchdog::ActionTargetMap(),
	std::move(fallback));
	EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());

	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Waiting default expiration
	EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

	// We should now have entered the fallback once the primary expires
	EXPECT_FALSE(wdog->enabled());
	auto remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	EXPECT_TRUE(wdog->enabled(true));

	// We should have re-entered the primary
	EXPECT_TRUE(wdog->enabled());
	EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Make sure the watchdog is started and enabled with a fallback
	* Wait through the initial trip and ensure the fallback is observed
	* Make sure that changing the primary interval and calling reset timer
	* will enable the primary watchdog with primary interval.
	*/
	TEST_F(WdogTest, enableWdogWithFallbackResetTimerEnable)
	{
	auto primaryInterval = Quantum(5);
	auto primaryIntervalMs = milliseconds(primaryInterval).count();
	auto fallbackInterval = primaryInterval * 2;
	auto fallbackIntervalMs = milliseconds(fallbackInterval).count();
	auto newInterval = fallbackInterval * 2;
	auto newIntervalMs = milliseconds(newInterval).count();

	// We need to make a wdog with the right fallback options
	// The interval is set to be noticeably different from the default
	// so we can always tell the difference
	Watchdog::Fallback fallback;
	fallback.action = Watchdog::Action::PowerOff;
	fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
	fallback.always = false;
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
	Watchdog::ActionTargetMap(),
	std::move(fallback));
	EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
	EXPECT_FALSE(wdog->enabled());
	EXPECT_EQ(0, wdog->timeRemaining());
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_FALSE(wdog->timerEnabled());

	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));

	// Waiting default expiration
	EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

	// We should now have entered the fallback once the primary expires
	EXPECT_FALSE(wdog->enabled());
	auto remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Setting the interval should take effect once resetTimer re-enables wdog
	EXPECT_EQ(newIntervalMs, wdog->interval(newIntervalMs));
	wdog->resetTimeRemaining(true);

	// We should have re-entered the primary
	EXPECT_TRUE(wdog->enabled());
	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(newInterval, remaining);
	EXPECT_LE(newInterval - Quantum(1), remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Make sure the watchdog is started and with a fallback without
	* sending an enable
	* Then enable the watchdog
	* Wait through the initial trip and ensure the fallback is observed
	* Make sure that fallback runs to completion and ensure the watchdog
	* is in the fallback state again
	*/
	TEST_F(WdogTest, enableWdogWithFallbackAlways)
	{
	auto primaryInterval = Quantum(5);
	auto primaryIntervalMs = milliseconds(primaryInterval).count();
	auto fallbackInterval = primaryInterval * 2;
	auto fallbackIntervalMs = milliseconds(fallbackInterval).count();

	// We need to make a wdog with the right fallback options
	// The interval is set to be noticeably different from the default
	// so we can always tell the difference
	Watchdog::Fallback fallback;
	fallback.action = Watchdog::Action::PowerOff;
	fallback.interval = static_cast<uint64_t>(fallbackIntervalMs);
	fallback.always = true;
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
	Watchdog::ActionTargetMap(), fallback,
	milliseconds(TEST_MIN_INTERVAL).count());

	// Make sure defualt interval is biggger than min interval
	EXPECT_LT(milliseconds((TEST_MIN_INTERVAL).count()),
	milliseconds(wdog->interval()));

	EXPECT_EQ(primaryInterval, milliseconds(wdog->interval(primaryIntervalMs)));
	EXPECT_FALSE(wdog->enabled());
	auto remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));
	EXPECT_GE(primaryInterval, milliseconds(wdog->timeRemaining()));

	// Waiting default expiration
	EXPECT_EQ(primaryInterval - Quantum(1), waitForWatchdog(primaryInterval));

	// We should now have entered the fallback once the primary expires
	EXPECT_FALSE(wdog->enabled());
	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Waiting fallback expiration
	EXPECT_EQ(fallbackInterval - Quantum(1), waitForWatchdog(fallbackInterval));

	// We should now enter the fallback again
	EXPECT_FALSE(wdog->enabled());
	remaining = milliseconds(wdog->timeRemaining());
	EXPECT_GE(fallbackInterval, remaining);
	EXPECT_LT(primaryInterval, remaining);
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	/** @brief Test minimal interval
	* The minimal interval was set 2 seconds
	* Test that when setting interval to 1s , it is still returning 2s
	*/
	TEST_F(WdogTest, verifyMinIntervalSetting)
	{
	auto newInterval = Quantum(1);
	auto newIntervalMs = milliseconds(newInterval).count();
	auto minIntervalMs = milliseconds(TEST_MIN_INTERVAL).count();

	// Check first that the current interval is greater than minInterval
	EXPECT_LT(minIntervalMs, wdog->interval());
	// Check that the interval was not set to smaller value than minInterval
	EXPECT_EQ(minIntervalMs, wdog->interval(newIntervalMs));
	// Check that the interval was not set to smaller value than minInterval
	EXPECT_EQ(minIntervalMs, wdog->interval());
	}

	/** @brief Test minimal interval
	* Initiate default Watchdog in order to get the default
	* interval.
	* Initiate watchdog with minInterval greater than default
	* interval, and make sure the default interval was set to the
	* minInterval.
	*/
	TEST_F(WdogTest, verifyConstructorMinIntervalSetting)
	{
	// Initiate default Watchdog and get the default interval value.
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event);
	auto defaultIntervalMs = wdog->interval();
	auto defaultInterval = milliseconds(defaultIntervalMs);
	auto minInterval = defaultInterval + Quantum(30);
	auto minIntervalMs = milliseconds(minInterval).count();

	// We initiate a new Watchdog with min interval greater than the default
	// intrval
	wdog.reset();
	wdog = std::make_unique<Watchdog>(bus, TEST_PATH, event,
	Watchdog::ActionTargetMap(), std::nullopt,
	minIntervalMs);
	// Check that the interval was set to the minInterval
	EXPECT_EQ(minIntervalMs, wdog->interval());

	// Enable and then verify
	EXPECT_TRUE(wdog->enabled(true));
	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());

	// Set remaining time shorter than minInterval will actually set it to
	// minInterval
	auto remaining = milliseconds(wdog->timeRemaining(defaultIntervalMs));

	// Its possible that we are off by few msecs depending on
	// how we get scheduled. So checking a range here.
	EXPECT_TRUE((remaining >= minInterval - Quantum(1)) &&
	(remaining <= minInterval));

	EXPECT_FALSE(wdog->timerExpired());
	EXPECT_TRUE(wdog->timerEnabled());
	}

	} // namespace watchdog
	} // namespace phosphor