fsfw/contrib/fsfw_contrib/etl-20.39.4/test/test_message_timer_interrupt.cpp

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2022 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/

#include "unit_test_framework.h"

#include "etl/message_router.h"
#include "etl/message_bus.h"
#include "etl/message_timer_interrupt.h"

#include <iostream>
#include <vector>

//***************************************************************************
// The set of messages.
//***************************************************************************
namespace
{
  uint64_t ticks = 0;

  //***************************************************************************
  struct ScopedGuard
  {
    ScopedGuard()
    {
      ++guard_count;
    }

    ~ScopedGuard()
    {
      --guard_count;
    }

    static int guard_count;
  };

  int ScopedGuard::guard_count = 0;

  //***************************************************************************
  struct TimerLogEntry
  {
    etl::timer::id::type id;
    uint64_t time_called;
  };

  //***************************************************************************
  enum
  {
    MESSAGE1,
    MESSAGE2,
    MESSAGE3,
    MESSAGE4
  };

  enum
  {
    ROUTER1 = 1,
  };

  struct Message1 : public etl::message<MESSAGE1>
  {
  };

  struct Message2 : public etl::message<MESSAGE2>
  {
  };

  struct Message3 : public etl::message<MESSAGE3>
  {
  };

  struct Message4 : public etl::message<MESSAGE4>
  {
  };

  Message1 message1;
  Message2 message2;
  Message3 message3;
  Message4 message4;

  //***************************************************************************
  // Router that handles messages 1, 2, 3
  //***************************************************************************
  class Router1 : public etl::message_router<Router1, Message1, Message2, Message3>
  {
  public:

    Router1()
      : message_router(ROUTER1)
    {
    }

    void on_receive(const Message1&)
    {
      message1.push_back(ticks);
    }

    void on_receive(const Message2&)
    {
      message2.push_back(ticks);
    }

    void on_receive(const Message3&)
    {
      message3.push_back(ticks);
    }

    void on_receive_unknown(const etl::imessage&)
    {
    }

    void clear()
    {
      message1.clear();
      message2.clear();
      message3.clear();
    }

    std::vector<uint64_t> message1;
    std::vector<uint64_t> message2;
    std::vector<uint64_t> message3;
  };

  //***************************************************************************
  // Bus that handles messages 1, 2, 3
  //***************************************************************************
  class Bus1 : public etl::message_bus<1>
  {

  };

  //***********************************
  Router1 router1;
  Bus1    bus1;

  SUITE(test_message_timer_interrupt)
  {
    //*************************************************************************
    TEST(message_timer_too_many_timers)
    {
      etl::message_timer_interrupt<2, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Single_Shot);

      CHECK(id1 != etl::timer::id::NO_TIMER);
      CHECK(id2 != etl::timer::id::NO_TIMER);
      CHECK(id3 == etl::timer::id::NO_TIMER);

      timer_controller.clear();
      id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Single_Shot);
      CHECK(id3 != etl::timer::id::NO_TIMER);

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_one_shot)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Single_Shot);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 37ULL };
      std::vector<uint64_t> compare2 = { 23ULL };
      std::vector<uint64_t> compare3 = { 11ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_one_shot_after_timeout)
    {
      etl::message_timer_interrupt<1, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Single_Shot);
      router1.clear();

      timer_controller.start(id1);
      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      // Timer should have timed out.

      CHECK(timer_controller.set_period(id1, 50));
      timer_controller.start(id1);

      router1.clear();

      ticks = 0;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      // Timer should have timed out.

      CHECK_EQUAL(50U, *router1.message1.data());

      CHECK(timer_controller.unregister_timer(id1));
      CHECK(!timer_controller.unregister_timer(id1));
      CHECK(!timer_controller.start(id1));
      CHECK(!timer_controller.stop(id1));

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_repeating)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 37ULL, 74ULL };
      std::vector<uint64_t> compare2 = { 23ULL, 46ULL, 69ULL, 92ULL };
      std::vector<uint64_t> compare3 = { 11ULL, 22ULL, 33ULL, 44ULL, 55ULL, 66ULL, 77ULL, 88ULL, 99ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_repeating_bigger_step)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      CHECK(!timer_controller.is_running());

      timer_controller.enable(true);

      CHECK(timer_controller.is_running());

      ticks = 0;

      const uint32_t step = 5UL;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 40ULL, 75ULL };
      std::vector<uint64_t> compare2 = { 25ULL, 50ULL, 70ULL, 95ULL };
      std::vector<uint64_t> compare3 = { 15ULL, 25ULL, 35ULL, 45ULL, 55ULL, 70ULL, 80ULL, 90ULL, 100ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_repeating_stop_start)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        if (ticks == 40)
        {
          timer_controller.start(id1);
          timer_controller.stop(id2);
        }

        if (ticks == 80)
        {
          timer_controller.stop(id1);
          timer_controller.start(id2);
        }

        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 77ULL };
      std::vector<uint64_t> compare2 = { 23ULL };
      std::vector<uint64_t> compare3 = { 11ULL, 22ULL, 33ULL, 44ULL, 55ULL, 66ULL, 77ULL, 88ULL, 99ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_repeating_register_unregister)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1;
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        if (ticks == 40)
        {
          timer_controller.unregister_timer(id2);

          id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
          timer_controller.start(id1);
        }

        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 77ULL };
      std::vector<uint64_t> compare2 = { 23ULL };
      std::vector<uint64_t> compare3 = { 11ULL, 22ULL, 33ULL, 44ULL, 55ULL, 66ULL, 77ULL, 88ULL, 99ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_repeating_clear)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        ticks += step;

        if (ticks == 40)
        {
          timer_controller.clear();
        }

        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 37ULL };
      std::vector<uint64_t> compare2 = { 23ULL };
      std::vector<uint64_t> compare3 = { 11ULL, 22ULL, 33ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_route_through_bus)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, bus1, 37, etl::timer::mode::Single_Shot, ROUTER1);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, bus1, 23, etl::timer::mode::Single_Shot, ROUTER1);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, bus1, 11, etl::timer::mode::Single_Shot, etl::imessage_router::ALL_MESSAGE_ROUTERS);

      bus1.subscribe(router1);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 37ULL };
      std::vector<uint64_t> compare2 = { 23ULL };
      std::vector<uint64_t> compare3 = { 11ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_immediate_delayed)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 5;
      timer_controller.tick(uint32_t(ticks));

      timer_controller.start(id1, etl::timer::start::Immediate);
      timer_controller.start(id2, etl::timer::start::Immediate);
      timer_controller.start(id3, etl::timer::start::Delayed);

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = { 6ULL, 42ULL, 79ULL };
      std::vector<uint64_t> compare2 = { 6ULL, 28ULL, 51ULL, 74ULL, 97ULL };
      std::vector<uint64_t> compare3 = { 16ULL, 27ULL, 38ULL, 49ULL, 60ULL, 71ULL, 82ULL, 93ULL };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), router1.message3.data(), compare3.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_one_shot_big_step_short_delay_insert)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 15, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1,  5, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 11UL;

      ticks += step;
      timer_controller.tick(step);

      ticks += step;
      timer_controller.tick(step);

      std::vector<uint64_t> compare1 = { 22 };
      std::vector<uint64_t> compare2 = { 11, 11, 22, 22 };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), router1.message2.data(), compare2.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_one_shot_empty_list_huge_tick_before_insert)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 5, etl::timer::mode::Single_Shot);

      router1.clear();

      timer_controller.start(id1);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 5ULL;

      for (uint32_t i = 0UL; i < step; ++i)
      {
        ++ticks;
        timer_controller.tick(1);
      }

      // Huge tick count.
      timer_controller.tick(UINT32_MAX - step + 1);

      timer_controller.start(id1);

      for (uint32_t i = 0UL; i < step; ++i)
      {
        ++ticks;
        timer_controller.tick(1);
      }
      std::vector<uint64_t> compare1 = { 5, 10 };

      CHECK_ARRAY_EQUAL(compare1.data(), router1.message1.data(), compare1.size());

      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }

    //*************************************************************************
    TEST(message_timer_time_to_next)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Repeating);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      CHECK_EQUAL(11, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(4, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(8, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(1, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(5, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(2, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(2, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(6, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(10, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(3, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(4, timer_controller.time_to_next());
    }

    //*************************************************************************
    TEST(message_timer_time_to_next_with_has_active_timer)
    {
      etl::message_timer_interrupt<3, ScopedGuard> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(message1, router1, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router1, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router1, 11, etl::timer::mode::Single_Shot);

      router1.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      timer_controller.tick(11);
      CHECK_EQUAL(12, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(23);
      CHECK_EQUAL(3, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(2);
      CHECK_EQUAL(1, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(1);
      CHECK_EQUAL(static_cast<etl::timer::interval::type>(etl::timer::interval::No_Active_Interval), timer_controller.time_to_next());
      CHECK_FALSE(timer_controller.has_active_timer());
    }

    //************************************************************************* 
    class RouterLog : public etl::message_router<RouterLog, Message1, Message2, Message3, Message4>
    {
    public:

      //*********************************
      RouterLog(etl::imessage_timer_interrupt<ScopedGuard>& timer_controller_)
        : message_router(ROUTER1)
        , timer_count(0)
        , timer_controller(timer_controller_)
      {
      }

      //*********************************
      void on_receive(const Message1&)
      {
        // Id0
        timer_log.push_back(TimerLogEntry{ 0, timer_count });
      }

      //*********************************
      void on_receive(const Message2&)
      {
        // Id1
        timer_log.push_back(TimerLogEntry{ 1, timer_count });
      }

      //*********************************
      void on_receive(const Message3&)
      {
        // Id2
        timer_log.push_back(TimerLogEntry{ 2, timer_count });
      }

      //*********************************
      void on_receive(const Message4&)
      {
        // Id3
        timer_log.push_back(TimerLogEntry{ 3, timer_count });
        timer_controller.start(1);
      }

      //*********************************
      void on_receive_unknown(const etl::imessage&)
      {
        timer_log.push_back(TimerLogEntry{ 99, timer_count });
      }

      size_t timer_count;
      std::vector<TimerLogEntry> timer_log;
      etl::imessage_timer_interrupt<ScopedGuard>& timer_controller;
    };

    TEST(message_timer_interrupt_log_timer_calls)
    {   
      etl::message_timer_interrupt<4, ScopedGuard> timer_controller;
      RouterLog router(timer_controller);

      timer_controller.enable(true);

      constexpr uint32_t T1 = 2U;
      constexpr uint32_t T2 = 3U;
      constexpr uint32_t T3 = 4U;
      constexpr uint32_t T4 = 5U;

      // Register the timers.
      etl::timer::id::type id1 = timer_controller.register_timer(message1, router, T1, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(message2, router, T2, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(message3, router, T3, etl::timer::mode::Repeating);
      etl::timer::id::type id4 = timer_controller.register_timer(message4, router, T4, etl::timer::mode::Repeating);

      // Start the repeating timers.
      timer_controller.start(id1);
      timer_controller.start(id2);
      timer_controller.start(id3);
      timer_controller.start(id4);

      // Run the timer.
      for (int i = 1; i < 50; ++i)
      {
        ++router.timer_count;
        timer_controller.tick(1);
      }

      // Check the results log.
      for (auto t : router.timer_log)
      {
        switch (t.id)
        {
        case 0:
        {
          CHECK_EQUAL(0, t.time_called % 2);
          break;
        }

        case 1:
        {
          CHECK_EQUAL(0, (t.time_called % 5) % 3);
          break;
        }

        case 2:
        {
          CHECK_EQUAL(0, t.time_called % 4);
          break;
        }

        case 3:
        {
          CHECK_EQUAL(0, t.time_called % 5);
          break;
        }

        default:
        {
          CHECK(false);
          break;
        }
        }
      }

      // Check the 
      CHECK_EQUAL(0U, ScopedGuard::guard_count);
    }
  };
}