etl/test/test_forward_list.cpp

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

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

Copyright(c) 2014 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
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

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 "data.h"

#include "etl/forward_list.h"

#include <algorithm>
#include <array>
#include <forward_list>
#include <functional>
#include <list>
#include <string>
#include <vector>

namespace
{
#include "etl/private/diagnostic_null_dereference_push.h"
  SUITE(test_forward_list)
  {
    const size_t SIZE = 10UL;

    typedef TestDataDC<std::string>  ItemDC;
    typedef TestDataNDC<std::string> ItemNDC;
    typedef TestDataM<uint32_t>      ItemM;

    typedef etl::forward_list<ItemDC, SIZE>  DataDC;
    typedef etl::forward_list<ItemNDC, SIZE> DataNDC;
    typedef etl::iforward_list<ItemNDC>      IDataNDC;

    typedef etl::forward_list<ItemM, SIZE> DataM;
    typedef etl::iforward_list<ItemM>      IDataM;

    typedef etl::forward_list<int, SIZE> DataInt;

    typedef std::forward_list<ItemDC>  CompareDataDC;
    typedef std::forward_list<ItemNDC> CompareDataNDC;
    typedef std::vector<ItemNDC>       InitialDataNDC;

    InitialDataNDC stable_sort_data;
    InitialDataNDC unsorted_data;
    InitialDataNDC sorted_data;
    InitialDataNDC non_unique_data;
    InitialDataNDC small_data;

    bool are_equal;

    //*************************************************************************
    struct SetupFixture
    {
      SetupFixture()
      {
        stable_sort_data = {ItemNDC("1", 1), ItemNDC("2", 2), ItemNDC("3", 3), ItemNDC("2", 4), ItemNDC("0", 5),
                            ItemNDC("2", 6), ItemNDC("7", 7), ItemNDC("4", 8), ItemNDC("4", 9), ItemNDC("8", 10)};
        unsorted_data    = {ItemNDC("1"), ItemNDC("0"), ItemNDC("3"), ItemNDC("2"), ItemNDC("5"),
                            ItemNDC("4"), ItemNDC("7"), ItemNDC("6"), ItemNDC("9"), ItemNDC("8")};
        sorted_data      = {ItemNDC("0"), ItemNDC("1"), ItemNDC("2"), ItemNDC("3"), ItemNDC("4"),
                            ItemNDC("5"), ItemNDC("6"), ItemNDC("7"), ItemNDC("8"), ItemNDC("9")};
        non_unique_data  = {ItemNDC("0"), ItemNDC("0"), ItemNDC("1"), ItemNDC("1"), ItemNDC("2"),
                            ItemNDC("3"), ItemNDC("3"), ItemNDC("3"), ItemNDC("4"), ItemNDC("5")};
        small_data       = {ItemNDC("0"), ItemNDC("1"), ItemNDC("2"), ItemNDC("3"), ItemNDC("4"), ItemNDC("5")};
      }
    };

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_default_constructor)
    {
      DataDC data;

      CHECK(data.empty());
      CHECK_EQUAL(data.max_size(), SIZE);
      CHECK(data.begin() == data.end());
    }

#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    //*************************************************************************
    TEST(test_cpp17_deduced_constructor)
    {
      etl::forward_list               data{ItemNDC("1", 1), ItemNDC("2", 2), ItemNDC("3", 3), ItemNDC("2", 4), ItemNDC("0", 5),
                             ItemNDC("2", 6), ItemNDC("7", 7), ItemNDC("4", 8), ItemNDC("4", 9), ItemNDC("8", 10)};
      etl::forward_list< ItemNDC, 10> check = {ItemNDC("1", 1), ItemNDC("2", 2), ItemNDC("3", 3), ItemNDC("2", 4), ItemNDC("0", 5),
                                               ItemNDC("2", 6), ItemNDC("7", 7), ItemNDC("4", 8), ItemNDC("4", 9), ItemNDC("8", 10)};

      CHECK(!data.empty());
      CHECK(data.full());
      CHECK(data.begin() != data.end());
      CHECK_EQUAL(0U, data.available());
      CHECK_EQUAL(10U, data.capacity());
      CHECK_EQUAL(10U, data.size());
      CHECK_EQUAL(10U, data.max_size());
      CHECK(data == check);
    }
#endif

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_size)
    {
      const size_t INITIAL_SIZE = 4UL;
      DataDC       data(INITIAL_SIZE);

      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_size_excess)
    {
      CHECK_THROW(DataDC data(SIZE + 1), etl::forward_list_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_size_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const ItemNDC INITIAL_VALUE("1");

      std::array<ItemNDC, INITIAL_SIZE> compare_data = {ItemNDC("1"), ItemNDC("1"), ItemNDC("1"), ItemNDC("1")};

      DataNDC data(INITIAL_SIZE, INITIAL_VALUE);

      CHECK(!data.empty());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());

      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_range)
    {
      CompareDataNDC compare(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      CHECK(!data.empty());

      are_equal = std::equal(data.begin(), data.end(), compare.begin());

      CHECK(are_equal);
    }

#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_initializer_list)
    {
      CompareDataNDC compare = {ItemNDC("0"), ItemNDC("1"), ItemNDC("2"), ItemNDC("3")};
      DataNDC        data    = {ItemNDC("0"), ItemNDC("1"), ItemNDC("2"), ItemNDC("3")};

      CHECK(!data.empty());

      are_equal = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(are_equal);
    }
#endif

    //*************************************************************************
    TEST(test_destruct_via_iforward_list)
    {
      int current_count = ItemNDC::get_instance_count();

      DataNDC* pdata = new DataNDC(sorted_data.begin(), sorted_data.end());
      CHECK_EQUAL(int(current_count + int(sorted_data.size())), ItemNDC::get_instance_count());

      IDataNDC* pidata = pdata;
      delete pidata;
      CHECK_EQUAL(current_count, ItemNDC::get_instance_count());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_copy_constructor)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());
      DataNDC        other_data(data);

      CHECK(std::equal(data.begin(), data.end(), other_data.begin()));
    }

    //*************************************************************************
    TEST(test_move_constructor)
    {
      ItemM p1(1U);
      ItemM p2(2U);
      ItemM p3(3U);
      ItemM p4(4U);

      DataM data1;
      data1.push_front(std::move(p1));
      data1.push_front(std::move(p2));
      data1.push_front(std::move(p3));
      data1.push_front(std::move(p4));

      CHECK(!bool(p1));
      CHECK(!bool(p2));
      CHECK(!bool(p3));
      CHECK(!bool(p4));

      DataM data2(std::move(data1));

      CHECK_EQUAL(0U, data1.size());
      CHECK_EQUAL(4U, data2.size());

      DataM::const_iterator itr = data2.begin();

      CHECK_EQUAL(4U, (*itr++).value);
      CHECK_EQUAL(3U, (*itr++).value);
      CHECK_EQUAL(2U, (*itr++).value);
      CHECK_EQUAL(1U, (*itr++).value);
    }

    //*************************************************************************
    TEST(test_move_assignment)
    {
      ItemM p1(1U);
      ItemM p2(2U);
      ItemM p3(3U);
      ItemM p4(4U);

      DataM data1;
      data1.push_front(std::move(p1));
      data1.push_front(std::move(p2));
      data1.push_front(std::move(p3));
      data1.push_front(std::move(p4));

      DataM data2;
      data2.push_front(ItemM(5U));
      data2 = std::move(data1);

      CHECK_EQUAL(0U, data1.size());
      CHECK_EQUAL(4U, data2.size());

      DataM::const_iterator itr = data2.begin();

      CHECK_EQUAL(4U, (*itr++).value);
      CHECK_EQUAL(3U, (*itr++).value);
      CHECK_EQUAL(2U, (*itr++).value);
      CHECK_EQUAL(1U, (*itr++).value);
    }

    //*************************************************************************
    TEST(test_move_assignment_interface)
    {
      ItemM p1(1U);
      ItemM p2(2U);
      ItemM p3(3U);
      ItemM p4(4U);

      DataM data1;
      data1.push_front(std::move(p1));
      data1.push_front(std::move(p2));
      data1.push_front(std::move(p3));
      data1.push_front(std::move(p4));

      DataM data2;
      data2.push_front(ItemM(5U));

      IDataM& idata1 = data1;
      IDataM& idata2 = data2;

      idata2 = std::move(idata1);

      CHECK_EQUAL(0U, data1.size());
      CHECK_EQUAL(4U, data2.size());

      DataM::const_iterator itr = data2.begin();

      CHECK_EQUAL(4U, (*itr++).value);
      CHECK_EQUAL(3U, (*itr++).value);
      CHECK_EQUAL(2U, (*itr++).value);
      CHECK_EQUAL(1U, (*itr++).value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_iterator)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(compare_data.begin(), compare_data.end());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());

      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_const_iterator)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      const DataNDC  data(compare_data.begin(), compare_data.end());

      are_equal = std::equal(data.cbegin(), data.cend(), compare_data.cbegin());

      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_up)
    {
      const size_t INITIAL_SIZE = 4UL;
      const size_t NEW_SIZE     = 8UL;
      const ItemDC VALUE("1");

      DataDC data(INITIAL_SIZE, VALUE);
      data.resize(NEW_SIZE);

      CompareDataDC compare_data(INITIAL_SIZE, VALUE);
      compare_data.resize(NEW_SIZE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_up_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const size_t  NEW_SIZE     = 8UL;
      const ItemNDC VALUE("1");

      DataNDC data(INITIAL_SIZE, VALUE);
      data.resize(NEW_SIZE, VALUE);

      CompareDataNDC compare_data(INITIAL_SIZE, VALUE);
      compare_data.resize(NEW_SIZE, VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_excess)
    {
      const size_t INITIAL_SIZE = 4UL;
      DataDC       data(INITIAL_SIZE);

      CHECK_THROW(data.resize(data.max_size() + 1), etl::forward_list_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_down)
    {
      const size_t INITIAL_SIZE = 4UL;
      const size_t NEW_SIZE     = 2UL;
      const ItemDC VALUE("1");

      DataDC data(INITIAL_SIZE, VALUE);
      data.resize(NEW_SIZE);

      CompareDataDC compare_data(INITIAL_SIZE, VALUE);
      compare_data.resize(NEW_SIZE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_down_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const size_t  NEW_SIZE     = 2UL;
      const ItemNDC VALUE("1");

      DataNDC data(INITIAL_SIZE, VALUE);
      data.resize(NEW_SIZE, VALUE);

      CompareDataNDC compare_data(INITIAL_SIZE, VALUE);
      compare_data.resize(NEW_SIZE, VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_resize_zero)
    {
      const size_t INITIAL_SIZE = 4UL;
      const size_t NEW_SIZE     = 0UL;
      const ItemDC VALUE("1");

      DataDC data(INITIAL_SIZE, VALUE);
      data.resize(NEW_SIZE);

      CompareDataDC compare_data(INITIAL_SIZE, VALUE);
      compare_data.resize(NEW_SIZE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_clear)
    {
      DataNDC data(sorted_data.begin(), sorted_data.end());
      data.clear();
      CHECK(data.empty());

      // Do it again to check that clear() didn't screw up the internals.
      data.assign(sorted_data.begin(), sorted_data.end());
      CHECK_EQUAL(SIZE, data.size());
      data.clear();
      CHECK_EQUAL(0UL, data.size());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_clear_pod)
    {
      DataInt data(SIZE, 1);

      data.clear();
      CHECK(data.empty());

      // Do it again to check that clear() didn't screw up the internals.
      data.resize(SIZE);
      CHECK_EQUAL(SIZE, data.size());
      data.clear();
      CHECK_EQUAL(0UL, data.size());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assign_range)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data;

      // Do it twice. We should only get one copy.
      data.assign(compare_data.begin(), compare_data.end());
      data.assign(compare_data.begin(), compare_data.end());

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assign_size_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const ItemNDC VALUE("1");

      CompareDataNDC compare_data(INITIAL_SIZE, VALUE);
      DataNDC        data;

      // Do it twice. We should only get one copy.
      data.assign(INITIAL_SIZE, VALUE);
      data.assign(INITIAL_SIZE, VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assign_size_value_excess)
    {
      const ItemNDC VALUE("1");

      DataNDC data;

      CHECK_THROW(data.assign(data.max_size() + 1, VALUE), etl::forward_list_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_after_position_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const ItemNDC VALUE("1");
      const ItemNDC INSERT_VALUE("2");

      CompareDataNDC compare_data(INITIAL_SIZE, VALUE);
      DataNDC        data(INITIAL_SIZE, VALUE);

      size_t offset = 2UL;

      DataNDC::iterator i_data = data.begin();
      std::advance(i_data, offset);

      CompareDataNDC::iterator i_compare_data = compare_data.begin();
      std::advance(i_compare_data, offset);

      data.insert_after(i_data, INSERT_VALUE);
      compare_data.insert_after(i_compare_data, INSERT_VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      offset = 0;

      i_data = data.begin();
      std::advance(i_data, offset);

      i_compare_data = compare_data.begin();
      std::advance(i_compare_data, offset);

      data.insert_after(i_data, INSERT_VALUE);
      compare_data.insert_after(i_compare_data, INSERT_VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_after_position_size_value)
    {
      const size_t  INITIAL_SIZE = 4UL;
      const ItemNDC VALUE("1");
      const ItemNDC INSERT_VALUE("2");

      CompareDataNDC compare_data(INITIAL_SIZE, VALUE);
      DataNDC        data(INITIAL_SIZE, VALUE);

      size_t offset = 2UL;

      DataNDC::iterator i_data = data.begin();
      std::advance(i_data, offset);

      CompareDataNDC::iterator i_compare_data = compare_data.begin();
      std::advance(i_compare_data, offset);

      data.insert_after(i_data, 2, INSERT_VALUE);
      compare_data.insert_after(i_compare_data, 2, INSERT_VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      offset = 0;

      i_data = data.begin();
      std::advance(i_data, offset);

      i_compare_data = compare_data.begin();
      std::advance(i_compare_data, offset);

      data.insert_after(i_data, 2, INSERT_VALUE);
      compare_data.insert_after(i_compare_data, 2, INSERT_VALUE);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_after_range)
    {
      std::vector<ItemNDC> test1 = {ItemNDC("0"), ItemNDC("1"), ItemNDC("2"), ItemNDC("3"), ItemNDC("4")};
      std::vector<ItemNDC> test2 = {ItemNDC("5"), ItemNDC("6"), ItemNDC("7"), ItemNDC("8"), ItemNDC("9")};

      CompareDataNDC compare_data(test1.begin(), test1.end());
      DataNDC        data(test1.begin(), test1.end());

      compare_data.insert_after(compare_data.before_begin(), test2.begin(), test2.end());
      data.insert_after(data.before_begin(), test2.begin(), test2.end());

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      compare_data.assign(test1.begin(), test1.end());
      data.assign(test1.begin(), test1.end());

      CompareDataNDC::iterator icd = compare_data.begin();
      DataNDC::iterator        id  = data.begin();

      std::advance(icd, 3);
      std::advance(id, 3);

      compare_data.insert_after(icd, test2.begin(), test2.end());
      data.insert_after(id, test2.begin(), test2.end());

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_push_front)
    {
      CompareDataNDC compare_data;
      DataNDC        data;

      compare_data.push_front(ItemNDC("1"));
      compare_data.push_front(ItemNDC("2"));
      compare_data.push_front(ItemNDC("3"));
      compare_data.push_front(ItemNDC("4"));
      compare_data.push_front(ItemNDC("5"));
      compare_data.push_front(ItemNDC("6"));

      CHECK_NO_THROW(data.push_front(ItemNDC("1")));
      CHECK_NO_THROW(data.push_front(ItemNDC("2")));
      CHECK_NO_THROW(data.push_front(ItemNDC("3")));
      CHECK_NO_THROW(data.push_front(ItemNDC("4")));
      CHECK_NO_THROW(data.push_front(ItemNDC("5")));
      CHECK_NO_THROW(data.push_front(ItemNDC("6")));

      CHECK_EQUAL(6U, data.size());
      CHECK_EQUAL(6, std::distance(data.begin(), data.end()));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_push_front_move)
    {
      ItemM p1(1U);
      ItemM p2(2U);
      ItemM p3(3U);
      ItemM p4(4U);

      DataM data;
      data.push_front(std::move(p1));
      data.push_front(std::move(p2));
      data.push_front(std::move(p3));
      data.push_front(std::move(p4));

      CHECK_EQUAL(4U, data.size());

      CHECK(!bool(p1));
      CHECK(!bool(p2));
      CHECK(!bool(p3));
      CHECK(!bool(p4));

      DataM::const_iterator itr = data.begin();

      CHECK_EQUAL(4U, (*itr++).value);
      CHECK_EQUAL(3U, (*itr++).value);
      CHECK_EQUAL(2U, (*itr++).value);
      CHECK_EQUAL(1U, (*itr++).value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_front)
    {
      CompareDataNDC compare_data;
      DataNDC        data;

      compare_data.emplace_front("1");
      compare_data.emplace_front("2");
      compare_data.emplace_front("3");
      compare_data.emplace_front("4");
      compare_data.emplace_front("5");
      compare_data.emplace_front("6");

      CHECK_NO_THROW(data.emplace_front("1"));
      CHECK_NO_THROW(data.emplace_front("2"));
      CHECK_NO_THROW(data.emplace_front("3"));
      CHECK_NO_THROW(data.emplace_front("4"));
      CHECK_NO_THROW(data.emplace_front("5"));
      CHECK_NO_THROW(data.emplace_front("6"));

      CHECK_EQUAL(6U, data.size());
      CHECK_EQUAL(6, std::distance(data.begin(), data.end()));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_front_return)
    {
      DataNDC data;

      data.emplace_front("24");
      auto& front = data.emplace_front("42");
      CHECK_EQUAL(front, data.front());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_after)
    {
      CompareDataNDC compare_data;
      DataNDC        data;

      CompareDataNDC::iterator itc;

      itc = compare_data.before_begin();
      compare_data.emplace_after(itc, "1");
      compare_data.emplace_after(itc, "2");

      ++itc;
      compare_data.emplace_after(itc, "3");
      compare_data.emplace_after(itc, "4");

      ++itc;
      compare_data.emplace_after(itc, "5");
      compare_data.emplace_after(itc, "6");

      DataNDC::iterator itd;

      itd = data.before_begin();
      CHECK_NO_THROW(data.emplace_after(itd, "1"));
      CHECK_NO_THROW(data.emplace_after(itd, "2"));

      ++itd;
      CHECK_NO_THROW(data.emplace_after(itd, "3"));
      CHECK_NO_THROW(data.emplace_after(itd, "4"));

      ++itd;
      CHECK_NO_THROW(data.emplace_after(itd, "5"));
      CHECK_NO_THROW(data.emplace_after(itd, "6"));

      CHECK_EQUAL(6U, data.size());
      CHECK_EQUAL(6, std::distance(data.begin(), data.end()));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_front_const)
    {
      const DataNDC data(sorted_data.begin(), sorted_data.end());

      CHECK_EQUAL(ItemNDC("0"), data.front());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_front_const_exception)
    {
      const DataNDC data;

      CHECK(data.empty());
      CHECK_THROW(data.front(), etl::forward_list_empty);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_before_begin_const)
    {
      const DataNDC data(sorted_data.begin(), sorted_data.end());

      DataNDC::const_iterator itr = data.before_begin();
      ++itr;

      are_equal = std::equal(data.begin(), data.end(), itr);

      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_push_front_excess)
    {
      DataNDC data;

      CHECK_NO_THROW(data.push_front(ItemNDC("0")));
      CHECK_NO_THROW(data.push_front(ItemNDC("1")));
      CHECK_NO_THROW(data.push_front(ItemNDC("2")));
      CHECK_NO_THROW(data.push_front(ItemNDC("3")));
      CHECK_NO_THROW(data.push_front(ItemNDC("4")));
      CHECK_NO_THROW(data.push_front(ItemNDC("5")));
      CHECK_NO_THROW(data.push_front(ItemNDC("6")));
      CHECK_NO_THROW(data.push_front(ItemNDC("7")));
      CHECK_NO_THROW(data.push_front(ItemNDC("8")));
      CHECK_NO_THROW(data.push_front(ItemNDC("9")));

      CHECK_THROW(data.push_front(ItemNDC("10")), etl::forward_list_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_push_front_pop_front)
    {
      DataNDC data;

      for (size_t i = 0UL; i < 2UL * data.max_size(); ++i)
      {
        CHECK_NO_THROW(data.push_front(ItemNDC("1")));
        data.pop_front();
      }

      CHECK(data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_pop_front_empty)
    {
      DataNDC data;

      CHECK_NO_THROW(data.push_front(ItemNDC("0")));
      CHECK_NO_THROW(data.push_front(ItemNDC("1")));
      CHECK_NO_THROW(data.push_front(ItemNDC("2")));
      CHECK_NO_THROW(data.push_front(ItemNDC("3")));

      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();

      CHECK_THROW(data.pop_front(), etl::forward_list_empty);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_after_single)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      DataNDC::iterator i_data = data.begin();
      std::advance(i_data, 2);

      CompareDataNDC::iterator i_compare_data = compare_data.begin();
      std::advance(i_compare_data, 2);

      i_compare_data = compare_data.erase_after(i_compare_data);
      i_data         = data.erase_after(i_data);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
      CHECK(*i_compare_data == *i_data);

      i_compare_data = compare_data.erase_after(compare_data.begin());
      i_data         = data.erase_after(data.begin());

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      are_equal = *i_data == *i_compare_data;
      CHECK(are_equal);

      // Move to the last value and erase.
      i_compare_data = compare_data.begin();
      // std::advance(i_compare_data, compare_data.size() - 1);
      i_compare_data = compare_data.erase_after(i_compare_data);

      i_data = data.begin();
      // std::advance(i_data, data.size() - 1);
      i_data = data.erase_after(i_data);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());

      CHECK(are_equal);
      are_equal = *i_data == *i_compare_data;
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_after_range)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      DataNDC::iterator i_data_1 = data.begin();
      std::advance(i_data_1, 2);

      DataNDC::iterator i_data_2 = data.begin();
      std::advance(i_data_2, 4);

      CompareDataNDC::iterator i_compare_data_1 = compare_data.begin();
      std::advance(i_compare_data_1, 2);

      CompareDataNDC::iterator i_compare_data_2 = compare_data.begin();
      std::advance(i_compare_data_2, 4);

      CompareDataNDC::iterator i_compare_result = compare_data.erase_after(i_compare_data_1, i_compare_data_2);

      DataNDC::iterator i_result = data.erase_after(i_data_1, i_data_2);

      CHECK_EQUAL(*i_compare_result, *i_result);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_after_range_end)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      DataNDC::iterator i_data = data.begin();
      std::advance(i_data, 4);

      CompareDataNDC::iterator i_compare_data = compare_data.begin();
      std::advance(i_compare_data, 4);

      compare_data.erase_after(i_compare_data, compare_data.end());

      DataNDC::iterator i_result = data.erase_after(i_data, data.end());

      CHECK(i_result == data.end());

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_after_all)
    {
      DataNDC data(sorted_data.begin(), sorted_data.end());

      data.erase_after(data.before_begin(), data.end());

      CHECK(data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_front)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      CHECK_EQUAL(compare_data.front(), data.front());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_front_exception)
    {
      DataNDC data;

      CHECK(data.empty());
      CHECK_THROW(data.front(), etl::forward_list_empty);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());
      DataNDC        other_data;

      other_data = data;

      CHECK_EQUAL(data.size(), other_data.size());

      are_equal = std::equal(data.begin(), data.end(), other_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment_interface)
    {
      DataNDC data1(sorted_data.begin(), sorted_data.end());
      DataNDC data2;

      IDataNDC& idata1 = data1;
      IDataNDC& idata2 = data2;

      idata2 = idata1;

      bool isEqual = std::equal(data1.begin(), data1.end(), data2.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_self_assignment)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());
      DataNDC        other_data(data);

#include "etl/private/diagnostic_self_assign_overloaded_push.h"
      other_data = other_data;
#include "etl/private/diagnostic_pop.h"

      CHECK_EQUAL(data.size(), other_data.size());

      are_equal = std::equal(data.begin(), data.end(), other_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_unique_empty)
    {
      CompareDataNDC compare_data;
      DataNDC        data;

      compare_data.unique();
      data.unique();

      if ((compare_data.begin() != compare_data.end()) && (data.begin() != data.end()))
      {
        CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

        are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
        CHECK(are_equal);
      }
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_unique)
    {
      CompareDataNDC compare_data(non_unique_data.begin(), non_unique_data.end());
      DataNDC        data(non_unique_data.begin(), non_unique_data.end());

      compare_data.unique();
      data.unique();

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_remove)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      compare_data.remove(ItemNDC("7"));
      data.remove(ItemNDC("7"));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_remove_if)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      compare_data.remove_if(std::bind(std::equal_to<ItemNDC>(), std::placeholders::_1, ItemNDC("7")));
      data.remove_if(std::bind(std::equal_to<ItemNDC>(), std::placeholders::_1, ItemNDC("7")));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_reverse)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      compare_data.reverse();
      data.reverse();

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());
      CHECK_EQUAL(data.size(), size_t(std::distance(data.begin(), data.end())));

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_reverse_empty)
    {
      DataNDC data;

      data.reverse();

      CHECK_TRUE(data.empty());
      CHECK_FALSE(data.full());
      CHECK_EQUAL(0, data.size());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_sort)
    {
      CompareDataNDC compare_data(unsorted_data.begin(), unsorted_data.end());
      DataNDC        data(unsorted_data.begin(), unsorted_data.end());

      compare_data.sort();
      data.sort();

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_stable_sort)
    {
      std::list<ItemNDC> compare_data(stable_sort_data.begin(), stable_sort_data.end());
      DataNDC            data(stable_sort_data.begin(), stable_sort_data.end());

      compare_data.sort();
      data.sort();

      std::list<ItemNDC>::const_iterator citr = compare_data.begin();
      DataNDC::const_iterator            ditr = data.begin();

      while (ditr != data.end())
      {
        CHECK_EQUAL(citr->index, ditr->index);

        ++citr;
        ++ditr;
      }
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_sort_empty)
    {
      CompareDataNDC compare_data;
      DataNDC        data;

      compare_data.sort();
      data.sort();

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      DataNDC::const_iterator        i_from_before;
      DataNDC::const_iterator        i_to_before;
      CompareDataNDC::const_iterator i_compare_from_before;
      CompareDataNDC::const_iterator i_compare_to_before;

      // Move to the beginning.
      i_from_before = data.begin();
      std::advance(i_from_before, 5);

      i_to_before = data.before_begin();

      i_compare_from_before = compare_data.begin();
      std::advance(i_compare_from_before, 5);

      i_compare_to_before = compare_data.before_begin();

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_from_before);
      data.move_after(i_from_before, i_to_before);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to the end.
      i_from_before = data.begin();
      std::advance(i_from_before, 5);

      i_to_before = data.begin();
      std::advance(i_to_before, 9);

      i_compare_from_before = compare_data.begin();
      std::advance(i_compare_from_before, 5);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 9);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_from_before);
      data.move_after(i_from_before, i_to_before);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to nearby.
      i_from_before = data.begin();
      std::advance(i_from_before, 3);

      i_to_before = data.begin();
      std::advance(i_to_before, 7);

      i_compare_from_before = compare_data.begin();
      std::advance(i_compare_from_before, 3);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 7);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_from_before);
      data.move_after(i_from_before, i_to_before);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to same.
      i_from_before = data.begin();
      std::advance(i_from_before, 3);

      i_to_before = data.begin();
      std::advance(i_to_before, 3);

      i_compare_from_before = compare_data.begin();
      std::advance(i_compare_from_before, 3);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 3);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_from_before);
      data.move_after(i_from_before, i_to_before);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_range)
    {
      CompareDataNDC compare_data(sorted_data.begin(), sorted_data.end());
      DataNDC        data(sorted_data.begin(), sorted_data.end());

      DataNDC::const_iterator        i_first_before;
      DataNDC::const_iterator        i_last;
      DataNDC::const_iterator        i_to_before;
      CompareDataNDC::const_iterator i_compare_first_before;
      CompareDataNDC::const_iterator i_compare_last;
      CompareDataNDC::const_iterator i_compare_to_before;

      // Move to the beginning.
      i_first_before = data.begin();
      std::advance(i_first_before, 4);

      i_last = i_first_before;
      std::advance(i_last, 4);

      i_to_before = data.before_begin();

      i_compare_first_before = compare_data.begin();
      std::advance(i_compare_first_before, 4);

      i_compare_last = i_compare_first_before;
      std::advance(i_compare_last, 4);

      i_compare_to_before = compare_data.before_begin();

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_first_before, i_compare_last);
      data.move_after(i_first_before, i_last, i_to_before);

      CHECK_EQUAL(size_t(std::distance(compare_data.begin(), compare_data.end())), data.size());

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to the end.
      i_first_before = data.begin();
      std::advance(i_first_before, 4);

      i_last = i_first_before;
      std::advance(i_last, 4);

      i_to_before = data.begin();
      std::advance(i_to_before, 9);

      i_compare_first_before = compare_data.begin();
      std::advance(i_compare_first_before, 4);

      i_compare_last = i_compare_first_before;
      std::advance(i_compare_last, 4);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 9);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_first_before, i_compare_last);
      data.move_after(i_first_before, i_last, i_to_before);

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to nearby.
      i_first_before = data.begin();
      std::advance(i_first_before, 4);

      i_last = i_first_before;
      std::advance(i_last, 4);

      i_to_before = data.begin();
      std::advance(i_to_before, 2);

      i_compare_first_before = compare_data.begin();
      std::advance(i_compare_first_before, 4);

      i_compare_last = i_compare_first_before;
      std::advance(i_compare_last, 4);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 2);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_first_before, i_compare_last);
      data.move_after(i_first_before, i_last, i_to_before);

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to same.
      i_first_before = data.begin();
      std::advance(i_first_before, 4);

      i_last = i_first_before;
      std::advance(i_last, 4);

      i_to_before = data.begin();
      std::advance(i_to_before, 4);

      i_compare_first_before = compare_data.begin();
      std::advance(i_compare_first_before, 4);

      i_compare_last = i_compare_first_before;
      std::advance(i_compare_last, 4);

      i_compare_to_before = compare_data.begin();
      std::advance(i_compare_to_before, 4);

      compare_data.splice_after(i_compare_to_before, compare_data, i_compare_first_before, i_compare_last);
      data.move_after(i_first_before, i_last, i_to_before);

      are_equal = std::equal(data.begin(), data.end(), compare_data.begin());
      CHECK(are_equal);

      // Move to illegal place.
      i_first_before = data.begin();
      std::advance(i_first_before, 2);
      i_last = i_first_before;
      std::advance(i_last, 3);
      i_to_before = i_first_before;
      std::advance(i_to_before, 2);

      CHECK_THROW(data.move_after(i_first_before, i_last, i_to_before), etl::forward_list_iterator);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_binary_comparisons)
    {
      DataNDC data1(sorted_data.begin(), sorted_data.end());
      DataNDC data2(sorted_data.begin(), sorted_data.end());
      DataNDC data3(unsorted_data.begin(), unsorted_data.end());

      CHECK(data1 == data2);
      CHECK(data1 != data3);
      CHECK(data1 < data3);
      CHECK(data3 > data1);
    }

    //*************************************************************************
    TEST(test_two_parameter_same_type_non_iterator)
    {
      // No compile error.
      etl::forward_list<int, 10> fl(10, 1);
      CHECK(fl.size() == 10);
      fl.assign(5, 2);
      CHECK(fl.size() == 5);
      fl.insert_after(fl.before_begin(), 5, 3);
      CHECK(fl.size() == fl.max_size());
    }

    //*************************************************************************
#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    TEST(test_forward_list_template_deduction)
    {
      etl::forward_list data{ItemNDC("A"), ItemNDC("B"), ItemNDC("C"), ItemNDC("D"), ItemNDC("E"), ItemNDC("F")};

      auto v     = *data.begin();
      using Type = decltype(v);
      CHECK((std::is_same_v<ItemNDC, Type>));

      decltype(data)::const_iterator itr = data.begin();

      CHECK_EQUAL(ItemNDC("A"), *itr++);
      CHECK_EQUAL(ItemNDC("B"), *itr++);
      CHECK_EQUAL(ItemNDC("C"), *itr++);
      CHECK_EQUAL(ItemNDC("D"), *itr++);
      CHECK_EQUAL(ItemNDC("E"), *itr++);
      CHECK_EQUAL(ItemNDC("F"), *itr++);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    TEST(test_make_forward_list)
    {
      auto data = etl::make_forward_list<ItemNDC>(ItemNDC("A"), ItemNDC("B"), ItemNDC("C"), ItemNDC("D"), ItemNDC("E"), ItemNDC("F"));

      auto v     = *data.begin();
      using Type = decltype(v);
      CHECK((std::is_same<ItemNDC, Type>::value));

      decltype(data)::const_iterator itr = data.begin();

      CHECK_EQUAL(ItemNDC("A"), *itr++);
      CHECK_EQUAL(ItemNDC("B"), *itr++);
      CHECK_EQUAL(ItemNDC("C"), *itr++);
      CHECK_EQUAL(ItemNDC("D"), *itr++);
      CHECK_EQUAL(ItemNDC("E"), *itr++);
      CHECK_EQUAL(ItemNDC("F"), *itr++);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    // Arguments that are const-qualified lvalues must be accepted and must not
    // affect the deduced element type. Guards against the defect fixed for
    // make_array and make_deque, which forwarded each argument as the element
    // type rather than as its own deduced type and so rejected const lvalues.
    TEST(test_make_forward_list_from_const_lvalues_of_element_type)
    {
      static const char static_const_lvalue = 42;
      const char        local_const_lvalue  = 43;
      char              mutable_lvalue      = 44;

      auto data = etl::make_forward_list(static_const_lvalue, local_const_lvalue, mutable_lvalue);

      auto v     = *data.begin();
      using Type = decltype(v);
      CHECK((std::is_same<char, Type>::value));

      decltype(data)::const_iterator itr = data.begin();

      CHECK_EQUAL(42, *itr++);
      CHECK_EQUAL(43, *itr++);
      CHECK_EQUAL(44, *itr++);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    TEST(test_make_forward_list_common_type_from_mixed_types)
    {
      auto data = etl::make_forward_list(1, 2L, 3);

      CHECK((std::is_same<etl::forward_list<long, 3U>, decltype(data)>::value));

      auto itr = data.begin();
      CHECK_EQUAL(1L, *itr++);
      CHECK_EQUAL(2L, *itr++);
      CHECK_EQUAL(3L, *itr++);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    struct CopyMoveCounted
    {
      explicit CopyMoveCounted(int value_)
        : value(value_)
      {
      }

      CopyMoveCounted(const CopyMoveCounted& other)
        : value(other.value)
      {
        ++copy_count;
      }

      CopyMoveCounted(CopyMoveCounted&& other)
        : value(other.value)
      {
        ++move_count;
      }

      int value;

      static size_t copy_count;
      static size_t move_count;
    };

    size_t CopyMoveCounted::copy_count = 0;
    size_t CopyMoveCounted::move_count = 0;

    // The arguments must be forwarded into the initializer list, not taken by
    // value: a by-value parameter pack would cost an extra move per argument
    // (the defect fixed for make_list). Each element is then copied from the
    // initializer_list backing array into its node, which is why lvalue
    // arguments count two copies.
    TEST(test_make_forward_list_argument_copy_and_move_counts)
    {
      const CopyMoveCounted const_lvalue(1);
      CopyMoveCounted       mutable_lvalue(2);

      CopyMoveCounted::copy_count = 0;
      CopyMoveCounted::move_count = 0;

      auto data = etl::make_forward_list(const_lvalue, mutable_lvalue);

      CHECK_EQUAL(4U, CopyMoveCounted::copy_count);
  #if ETL_USING_CPP17
      // The exact move counts rely on guaranteed copy elision. Before C++17 the
      // returned forward_list may be move-constructed once more, which moves each
      // element, so only the copy counts are checked there.
      CHECK_EQUAL(0U, CopyMoveCounted::move_count);
  #endif

      CopyMoveCounted::copy_count = 0;
      CopyMoveCounted::move_count = 0;

      auto data2 = etl::make_forward_list(CopyMoveCounted(3));

      CHECK_EQUAL(1U, CopyMoveCounted::copy_count);
  #if ETL_USING_CPP17
      CHECK_EQUAL(1U, CopyMoveCounted::move_count);
  #endif

      auto itr = data.begin();
      CHECK_EQUAL(1, (*itr++).value);
      CHECK_EQUAL(2, (*itr).value);
      CHECK_EQUAL(3, data2.begin()->value);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    // An explicit element type selects the element type and converts every
    // argument (Library Fundamentals TS make_array design), accepting
    // const-qualified lvalues and narrowing initialisers.
    TEST(test_make_forward_list_explicit_element_type)
    {
      static const char static_const_lvalue = 42;
      const char        local_const_lvalue  = 43;
      char              mutable_lvalue      = 44;

      auto data = etl::make_forward_list<char>(static_const_lvalue, local_const_lvalue, mutable_lvalue, 45, 46);

      CHECK((std::is_same<etl::forward_list<char, 5U>, decltype(data)>::value));

      auto itr = data.begin();
      CHECK_EQUAL(42, *itr++);
      CHECK_EQUAL(43, *itr++);
      CHECK_EQUAL(44, *itr++);
      CHECK_EQUAL(45, *itr++);
      CHECK_EQUAL(46, *itr++);
    }
#endif

    //*************************************************************************
    TEST(test_forward_list_exception_types)
    {
      // Verify exception class hierarchy is correct
      CHECK(true == (std::is_base_of<etl::exception, etl::forward_list_exception>::value));
      CHECK(true == (std::is_base_of<etl::forward_list_exception, etl::forward_list_full>::value));
      CHECK(true == (std::is_base_of<etl::forward_list_exception, etl::forward_list_empty>::value));
      CHECK(true == (std::is_base_of<etl::forward_list_exception, etl::forward_list_iterator>::value));

#if defined(ETL_VERBOSE_ERRORS)
      // When verbose errors are enabled, check the error text contains "forward_list"
      etl::forward_list_full  ex_full(__FILE__, __LINE__);
      etl::forward_list_empty ex_empty(__FILE__, __LINE__);

      std::string full_msg(ex_full.what());
      std::string empty_msg(ex_empty.what());

      CHECK(full_msg.find("forward_list") != std::string::npos);
      CHECK(empty_msg.find("forward_list") != std::string::npos);
#endif
    }
  }
#include "etl/private/diagnostic_pop.h"
} // namespace