etl/test/test_deque.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 "etl/deque.h"
#include "etl/vector.h"

#include "data.h"

#include <algorithm>
#include <array>
#include <cstring>
#include <deque>
#include <iostream>
#include <memory>
#include <numeric>
#include <vector>

#include "etl/private/diagnostic_useless_cast_push.h"

namespace
{
  SUITE(test_deque)
  {
    const size_t SIZE = 14UL;

    typedef TestDataDC<std::string>  DC;
    typedef TestDataNDC<std::string> NDC;

    typedef etl::deque<int, SIZE> DataInt;
    typedef etl::ideque<int>      IDataInt;
    typedef etl::deque<DC, SIZE>  DataDC;
    typedef etl::deque<NDC, SIZE> DataNDC;
    typedef etl::ideque<NDC>      IDataNDC;

    typedef std::deque<NDC> Compare_Data;
    typedef std::deque<DC>  Compare_DataDC;

    NDC N0   = NDC("0");
    NDC N1   = NDC("1");
    NDC N2   = NDC("2");
    NDC N3   = NDC("3");
    NDC N4   = NDC("4");
    NDC N5   = NDC("5");
    NDC N6   = NDC("6");
    NDC N7   = NDC("7");
    NDC N8   = NDC("8");
    NDC N9   = NDC("9");
    NDC N10  = NDC("10");
    NDC N11  = NDC("11");
    NDC N12  = NDC("12");
    NDC N13  = NDC("13");
    NDC N14  = NDC("14");
    NDC N15  = NDC("15");
    NDC N16  = NDC("16");
    NDC N17  = NDC("17");
    NDC N999 = NDC("999");

    std::vector<NDC> blank_data          = {N999, N999, N999, N999, N999, N999, N999, N999, N999, N999, N999, N999, N999, N999};
    std::vector<NDC> initial_data        = {N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13};
    std::vector<NDC> initial_data_excess = {N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14};
    std::vector<NDC> initial_data_under  = {N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11};
    std::vector<NDC> initial_data_small  = {N0, N1, N2, N3, N4, N5, N6, N7, N8, N9};
    std::vector<NDC> insert_data         = {N10, N11, N12, N13, N14};
    std::vector<DC>  initial_data_dc     = {DC("0"), DC("1"), DC("2"), DC("3"),  DC("4"),  DC("5"),  DC("6"),
                                            DC("7"), DC("8"), DC("9"), DC("10"), DC("11"), DC("12"), DC("13")};
    std::vector<int> int_data1           = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
    std::vector<int> int_data2           = {15, 16, 17, 18};

    //*************************************************************************
    TEST(test_constructor)
    {
      DataDC data;

      CHECK(data.empty());
      CHECK(!data.full());
      CHECK(data.begin() == data.end());
      CHECK_EQUAL(0U, data.size());
      CHECK_EQUAL(SIZE, data.max_size());
    }

    //*************************************************************************
    TEST(test_constructor_fill)
    {
      Compare_Data compare_data(SIZE, N999);
      DataNDC      data(SIZE, N999);

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_destruct_via_ideque)
    {
      int current_count = NDC::get_instance_count();

      DataNDC* pdata = new DataNDC(SIZE, N999);
      CHECK_EQUAL(int(current_count + int(SIZE)), NDC::get_instance_count());

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

    //*************************************************************************
    TEST(test_constructor_fill_excess)
    {
      CHECK_THROW(DataNDC(SIZE + 1, N999), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_constructor_range)
    {
      Compare_Data compare_data(initial_data.begin(), initial_data.end());
      DataNDC      data(initial_data.begin(), initial_data.end());

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    TEST(test_constructor_initializer_list)
    {
      Compare_Data compare_data = {N0, N1, N2, N3};
      DataNDC      data         = {N0, N1, N2, N3};

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }
#endif

    //*************************************************************************
    TEST(test_copy_constructor)
    {
      DataNDC deque1(initial_data.begin(), initial_data.end());
      DataNDC deque2(deque1);

      CHECK_EQUAL(deque1.size(), deque2.size());
      CHECK(std::equal(deque1.begin(), deque1.end(), deque2.begin()));
    }

    //*************************************************************************
    TEST(test_move_constructor)
    {
      typedef etl::deque<std::unique_ptr<uint32_t>, SIZE> Data;

      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));

      Data deque1;
      deque1.push_back(std::move(p1));
      deque1.push_back(std::move(p2));
      deque1.push_back(std::move(p3));
      deque1.push_back(std::move(p4));

      Data deque2(std::move(deque1));

      CHECK_EQUAL(4U, deque2.size());

      std::unique_ptr<uint32_t> pr = std::move(*deque2.begin());

      CHECK_EQUAL(1U, *pr);
      CHECK_EQUAL(2U, *deque2[1]);
      CHECK_EQUAL(3U, *deque2[2]);
      CHECK_EQUAL(4U, *deque2[3]);
    }

    //*************************************************************************
    TEST(test_move_insert_erase)
    {
      typedef etl::deque<std::unique_ptr<uint32_t>, SIZE> Data;

      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));

      Data deque1;
      deque1.push_back(std::move(p1));
      deque1.push_back(std::move(p2));
      deque1.push_back(std::move(p4));

      deque1.insert(deque1.begin() + 2U, std::move(p3));

      CHECK_EQUAL(4U, deque1.size());

      CHECK(bool(deque1[0]));
      CHECK(bool(deque1[1]));
      CHECK(bool(deque1[2]));
      CHECK(bool(deque1[3]));

      CHECK_EQUAL(1U, *deque1[0]);
      CHECK_EQUAL(2U, *deque1[1]);
      CHECK_EQUAL(3U, *deque1[2]);
      CHECK_EQUAL(4U, *deque1[3]);

      deque1.erase(deque1.begin() + 1);

      CHECK(bool(deque1[0]));
      CHECK(bool(deque1[1]));
      CHECK(bool(deque1[2]));

      CHECK_EQUAL(1U, *deque1[0]);
      CHECK_EQUAL(3U, *deque1[1]);
      CHECK_EQUAL(4U, *deque1[2]);
    }

    //*************************************************************************
    TEST(test_assignment)
    {
      DataNDC deque1(initial_data.begin(), initial_data.end());
      DataNDC deque2;

      deque2 = deque1;

      CHECK_EQUAL(deque1.size(), deque2.size());
      CHECK(std::equal(deque1.begin(), deque1.end(), deque2.begin()));
    }

    //*************************************************************************
    TEST(test_move_assignment)
    {
      typedef etl::deque<std::unique_ptr<uint32_t>, SIZE> Data;

      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));
      std::unique_ptr<uint32_t> p5(new uint32_t(5U));

      Data deque1;
      deque1.push_back(std::move(p1));
      deque1.push_back(std::move(p2));
      deque1.push_back(std::move(p3));
      deque1.push_back(std::move(p4));

      Data deque2;
      deque2.push_back(std::move(p5));
      deque2 = std::move(deque1);

      CHECK_EQUAL(4U, deque2.size());

      CHECK_EQUAL(1U, *deque2[0]);
      CHECK_EQUAL(2U, *deque2[1]);
      CHECK_EQUAL(3U, *deque2[2]);
      CHECK_EQUAL(4U, *deque2[3]);
    }

    //*************************************************************************
    TEST(test_assignment_interface)
    {
      DataNDC deque1(initial_data.begin(), initial_data.end());
      DataNDC deque2;

      IDataNDC& ideque1 = deque1;
      IDataNDC& ideque2 = deque2;

      ideque2 = ideque1;

      CHECK_EQUAL(deque1.size(), deque2.size());
      CHECK(std::equal(deque1.begin(), deque1.end(), deque2.begin()));
    }

    //*************************************************************************
    TEST(test_move_assignment_interface)
    {
      typedef etl::deque<std::unique_ptr<uint32_t>, SIZE> Data;
      typedef etl::ideque<std::unique_ptr<uint32_t>>      IData;

      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));
      std::unique_ptr<uint32_t> p5(new uint32_t(5U));

      Data deque1;
      deque1.push_back(std::move(p1));
      deque1.push_back(std::move(p2));
      deque1.push_back(std::move(p3));
      deque1.push_back(std::move(p4));

      Data deque2;
      deque2.push_back(std::move(p5));

      IData& ideque1 = deque1;
      IData& ideque2 = deque2;

      ideque2 = std::move(ideque1);

      CHECK_EQUAL(0U, deque1.size());
      CHECK_EQUAL(4U, deque2.size());

      CHECK_EQUAL(1U, *deque2[0]);
      CHECK_EQUAL(2U, *deque2[1]);
      CHECK_EQUAL(3U, *deque2[2]);
      CHECK_EQUAL(4U, *deque2[3]);
    }

    //*************************************************************************
    TEST(test_self_assignment)
    {
      DataNDC deque1(initial_data.begin(), initial_data.end());
      DataNDC deque2(deque1);

#include "etl/private/diagnostic_self_assign_overloaded_push.h"
      deque2 = deque2;
#include "etl/private/diagnostic_pop.h"

      CHECK_EQUAL(deque1.size(), deque2.size());
      CHECK(std::equal(deque1.begin(), deque1.end(), deque2.begin()));
    }

    //*************************************************************************
    TEST(test_assign_range)
    {
      DataNDC data;

      CHECK_NO_THROW(data.assign(initial_data.begin(), initial_data.end()));

      CHECK_EQUAL(initial_data.size(), data.size());
      CHECK(std::equal(initial_data.begin(), initial_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_assign_range_excess)
    {
      DataNDC data;

      CHECK_THROW(data.assign(initial_data_excess.begin(), initial_data_excess.end()), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_assign_fill)
    {
      Compare_Data compare_data;
      DataNDC      data;

      compare_data.assign(SIZE, N999);

      CHECK_NO_THROW(data.assign(SIZE, N999));

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_assign_fill_excess)
    {
      DataNDC data;

      CHECK_THROW(data.assign(SIZE + 1, N999), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_at)
    {
      Compare_Data compare_data(initial_data.begin(), initial_data.end());
      DataNDC      data(initial_data.begin(), initial_data.end());

      CHECK_EQUAL(compare_data.at(0), data.at(0));
      CHECK_EQUAL(compare_data.at(1), data.at(1));
      CHECK_EQUAL(compare_data.at(2), data.at(2));
      CHECK_EQUAL(compare_data.at(3), data.at(3));
      CHECK_EQUAL(compare_data.at(4), data.at(4));
      CHECK_EQUAL(compare_data.at(5), data.at(5));
    }

    //*************************************************************************
    TEST(test_at_out_of_bounds)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data.at(data.size()), etl::deque_out_of_bounds);
    }

    //*************************************************************************
    TEST(test_at_const)
    {
      const Compare_Data compare_data(initial_data.begin(), initial_data.end());
      const DataNDC      data(initial_data.begin(), initial_data.end());

      CHECK_EQUAL(compare_data.at(0), data.at(0));
      CHECK_EQUAL(compare_data.at(1), data.at(1));
      CHECK_EQUAL(compare_data.at(2), data.at(2));
      CHECK_EQUAL(compare_data.at(3), data.at(3));
      CHECK_EQUAL(compare_data.at(4), data.at(4));
      CHECK_EQUAL(compare_data.at(5), data.at(5));
    }

    //*************************************************************************
    TEST(test_at_const_out_of_bounds)
    {
      const DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data.at(data.size()), etl::deque_out_of_bounds);
    }

    //*************************************************************************
    TEST(test_index_operator)
    {
      Compare_Data compare_data(initial_data.begin(), initial_data.end());
      DataNDC      data(initial_data.begin(), initial_data.end());

      CHECK_EQUAL(compare_data[0], data[0]);
      CHECK_EQUAL(compare_data[1], data[1]);
      CHECK_EQUAL(compare_data[2], data[2]);
      CHECK_EQUAL(compare_data[3], data[3]);
      CHECK_EQUAL(compare_data[4], data[4]);
      CHECK_EQUAL(compare_data[5], data[5]);
    }

    //*************************************************************************
    TEST(test_index_operator_out_of_bounds)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data[data.size()], etl::deque_out_of_bounds);
    }

    //*************************************************************************
    TEST(test_index_operator_const)
    {
      const Compare_Data compare_data(initial_data.begin(), initial_data.end());
      const DataNDC      data(initial_data.begin(), initial_data.end());

      CHECK_EQUAL(compare_data[0], data[0]);
      CHECK_EQUAL(compare_data[1], data[1]);
      CHECK_EQUAL(compare_data[2], data[2]);
      CHECK_EQUAL(compare_data[3], data[3]);
      CHECK_EQUAL(compare_data[4], data[4]);
      CHECK_EQUAL(compare_data[5], data[5]);
    }

    //*************************************************************************
    TEST(test_index_operator_const_out_of_bounds)
    {
      const DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data[data.size()], etl::deque_out_of_bounds);
    }

    //*************************************************************************
    TEST(test_front)
    {
      DataNDC data;

      data.push_front(N1);
      CHECK_EQUAL(N1, data.front());

      data.push_front(N2);
      CHECK_EQUAL(N2, data.front());

      data.push_front(N3);
      CHECK_EQUAL(N3, data.front());

      data.push_front(N4);
      CHECK_EQUAL(N4, data.front());

      data.push_front(N5);
      CHECK_EQUAL(N5, data.front());

      data.push_front(N6);
      CHECK_EQUAL(N6, data.front());
    }

    //*************************************************************************
    TEST(test_front_exception)
    {
      DataNDC data;

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

    //*************************************************************************
    TEST(test_front_const)
    {
      DataNDC        data;
      const DataNDC& ctestDeque = data;

      data.push_front(N1);
      CHECK_EQUAL(N1, ctestDeque.front());

      data.push_front(N2);
      CHECK_EQUAL(N2, ctestDeque.front());

      data.push_front(N3);
      CHECK_EQUAL(N3, ctestDeque.front());

      data.push_front(N4);
      CHECK_EQUAL(N4, ctestDeque.front());

      data.push_front(N5);
      CHECK_EQUAL(N5, ctestDeque.front());

      data.push_front(N6);
      CHECK_EQUAL(N6, ctestDeque.front());
    }

    //*************************************************************************
    TEST(test_back)
    {
      DataNDC data;

      data.push_back(N1);
      CHECK_EQUAL(N1, data.back());

      data.push_back(N2);
      CHECK_EQUAL(N2, data.back());

      data.push_back(N3);
      CHECK_EQUAL(N3, data.back());

      data.push_back(N4);
      CHECK_EQUAL(N4, data.back());

      data.push_back(N5);
      CHECK_EQUAL(N5, data.back());

      data.push_back(N6);
      CHECK_EQUAL(N6, data.back());
    }

    //*************************************************************************
    TEST(test_back_exception)
    {
      DataNDC data;

      CHECK(data.empty());
      CHECK_THROW(data.back(), etl::deque_empty);
    }

    //*************************************************************************
    TEST(test_back_const)
    {
      DataNDC        data;
      const DataNDC& ctestDeque = data;

      data.push_back(N1);
      CHECK_EQUAL(N1, ctestDeque.back());

      data.push_back(N2);
      CHECK_EQUAL(N2, ctestDeque.back());

      data.push_back(N3);
      CHECK_EQUAL(N3, ctestDeque.back());

      data.push_back(N4);
      CHECK_EQUAL(N4, ctestDeque.back());

      data.push_back(N5);
      CHECK_EQUAL(N5, ctestDeque.back());

      data.push_back(N6);
      CHECK_EQUAL(N6, ctestDeque.back());
    }

    //*************************************************************************
    TEST(test_iterator_comparison)
    {
      DataNDC data(SIZE, N0);

      DataNDC::iterator first  = data.begin() + 1;
      DataNDC::iterator second = data.begin() + 1;
      DataNDC::iterator third  = data.begin() + 4;

      CHECK(first == second);
      CHECK(second == first);
      CHECK(!(first == third));
      CHECK(!(third == first));

      CHECK(!(first != second));
      CHECK(!(second != first));
      CHECK(first != third);
      CHECK(third != first);

      CHECK(!(first < second));
      CHECK(!(second < first));
      CHECK(first < third);
      CHECK(!(third < first));

      CHECK(first <= second);
      CHECK(second <= first);
      CHECK(first <= third);
      CHECK(!(third <= first));

      CHECK(!(first > second));
      CHECK(!(second > first));
      CHECK(!(first > third));
      CHECK(third > first);

      CHECK(first >= second);
      CHECK(second >= first);
      CHECK(!(first >= third));
      CHECK(third >= first);
    }

    //*************************************************************************
    TEST(test_const_iterator_comparison)
    {
      DataNDC data(SIZE, N0);

      DataNDC::const_iterator first  = data.begin() + 1;
      DataNDC::const_iterator second = data.begin() + 1;
      DataNDC::const_iterator third  = data.begin() + 4;

      CHECK(first == second);
      CHECK(second == first);
      CHECK(!(first == third));
      CHECK(!(third == first));

      CHECK(!(first != second));
      CHECK(!(second != first));
      CHECK(first != third);
      CHECK(third != first);

      CHECK(!(first < second));
      CHECK(!(second < first));
      CHECK(first < third);
      CHECK(!(third < first));

      CHECK(first <= second);
      CHECK(second <= first);
      CHECK(first <= third);
      CHECK(!(third <= first));

      CHECK(!(first > second));
      CHECK(!(second > first));
      CHECK(!(first > third));
      CHECK(third > first);

      CHECK(first >= second);
      CHECK(second >= first);
      CHECK(!(first >= third));
      CHECK(third >= first);
    }

    //*************************************************************************
    // The member swap() must exchange the complete iterator state (index,
    // owning deque and buffer).
    TEST(test_iterator_swap_different_deques)
    {
      DataInt data1 = {1, 2, 3, 4, 5};
      DataInt data2 = {10, 20, 30, 40, 50};

      DataInt::iterator itr1 = data1.begin() + 1; // -> 2
      DataInt::iterator itr2 = data2.begin() + 3; // -> 40

      itr1.swap(itr2);

      CHECK_EQUAL(40, *itr1);
      CHECK_EQUAL(2, *itr2);
      CHECK(&itr1.container() == &data2);
      CHECK(&itr2.container() == &data1);
    }

    //*************************************************************************
    TEST(test_const_iterator_swap_different_deques)
    {
      DataInt data1 = {1, 2, 3, 4, 5};
      DataInt data2 = {10, 20, 30, 40, 50};

      DataInt::const_iterator itr1 = data1.begin() + 1; // -> 2
      DataInt::const_iterator itr2 = data2.begin() + 3; // -> 40

      itr1.swap(itr2);

      CHECK_EQUAL(40, *itr1);
      CHECK_EQUAL(2, *itr2);
      CHECK(&itr1.container() == &data2);
      CHECK(&itr2.container() == &data1);
    }

    //*************************************************************************
    TEST(test_iterator_comparison_rollover_left)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::const_iterator first  = data.cbegin() + 1;
      DataNDC::const_iterator second = data.cbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_const_iterator_comparison_rollover_left)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::const_iterator first  = data.cbegin() + 1;
      DataNDC::const_iterator second = data.cbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_iterator_comparison_rollover_right)
    {
      DataNDC data(SIZE, N0);

      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);

      DataNDC::iterator first  = data.begin() + 1;
      DataNDC::iterator second = data.begin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_const_iterator_comparison_rollover_right)
    {
      DataNDC data(SIZE, N0);

      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);

      DataNDC::const_iterator first  = data.cbegin() + 1;
      DataNDC::const_iterator second = data.cbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_reverse_iterator_difference)
    {
      DataNDC data(SIZE, N0);

      DataNDC::reverse_iterator first  = data.rbegin() + 1;
      DataNDC::reverse_iterator second = data.rbegin() + 4;

      CHECK_EQUAL(-3, first - second);
      CHECK_EQUAL(3, second - first);
    }

    //*************************************************************************
    TEST(test_const_reverse_iterator_difference)
    {
      DataNDC data(SIZE, N0);

      DataNDC::const_reverse_iterator first  = data.crbegin() + 1;
      DataNDC::const_reverse_iterator second = data.crbegin() + 4;

      CHECK_EQUAL(-3, first - second);
      CHECK_EQUAL(3, second - first);
    }

    //*************************************************************************
    TEST(test_reverse_iterator_difference_rollover)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::reverse_iterator first  = data.rbegin() + 1;
      DataNDC::reverse_iterator second = data.rbegin() + 4;

      CHECK_EQUAL(-3, first - second);
      CHECK_EQUAL(3, second - first);
    }

    //*************************************************************************
    TEST(test_const_reverse_iterator_difference_rollover)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::const_reverse_iterator first  = data.crbegin() + 1;
      DataNDC::const_reverse_iterator second = data.crbegin() + 4;

      CHECK_EQUAL(-3, first - second);
      CHECK_EQUAL(3, second - first);
    }

    //*************************************************************************
    TEST(test_reverse_iterator_comparison)
    {
      DataNDC data(SIZE, N0);

      DataNDC::reverse_iterator first  = data.rbegin() + 1;
      DataNDC::reverse_iterator second = data.rbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_const_reverse_iterator_comparison)
    {
      DataNDC data(SIZE, N0);

      DataNDC::const_reverse_iterator first  = data.crbegin() + 1;
      DataNDC::const_reverse_iterator second = data.crbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_reverse_iterator_comparison_rollover_left)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::reverse_iterator first  = data.rbegin() + 1;
      DataNDC::reverse_iterator second = data.rbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_const_reverse_iterator_comparison_rollover_left)
    {
      DataNDC data(SIZE, N0);

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);
      data.push_front(N1);

      DataNDC::const_reverse_iterator first  = data.crbegin() + 1;
      DataNDC::const_reverse_iterator second = data.crbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_reverse_iterator_comparison_rollover_right)
    {
      DataNDC data(SIZE, N0);

      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);

      DataNDC::reverse_iterator first  = data.rbegin() + 1;
      DataNDC::reverse_iterator second = data.rbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_const_reverse_iterator_comparison_rollover_right)
    {
      DataNDC data(SIZE, N0);

      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);
      data.push_back(N1);

      DataNDC::const_reverse_iterator first  = data.crbegin() + 1;
      DataNDC::const_reverse_iterator second = data.crbegin() + 4;

      CHECK(first < second);
      CHECK(!(second < first));
    }

    //*************************************************************************
    TEST(test_empty)
    {
      DataNDC data;

      CHECK(data.empty());
    }

    //*************************************************************************
    TEST(test_full)
    {
      DataDC data;
      data.resize(SIZE);

      CHECK(data.full());
    }

    //*************************************************************************
    TEST(test_clear)
    {
      DataDC data;

      data.resize(SIZE);
      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(data.empty());
    }

    //*************************************************************************
    TEST(test_clear_pod)
    {
      DataInt data;

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

      // Do it again to check that clear() didn't screw up the internals.
      data.resize(SIZE);
      data.clear();
      CHECK(data.empty());
    }

    //*************************************************************************
    TEST(test_insert_to_empty)
    {
      const int           value(5);
      const size_t        insertCount = 2UL;
      etl::deque<int, 2>  valuesToInsert(insertCount, value);
      etl::deque<int, 10> data;

      data.insert(data.cbegin(), valuesToInsert.begin(), valuesToInsert.end());

      CHECK_EQUAL(insertCount, std::distance(data.begin(), data.end()));
      CHECK(data.size() == insertCount);
      CHECK(data[0] == value);
      CHECK(data[1] == value);
      CHECK(std::equal(data.begin(), data.end(), valuesToInsert.begin()));
    }

    //*************************************************************************
    TEST(test_insert_value_begin)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.insert(compare_data.cbegin(), N14);
      DataNDC::iterator      position  = data.insert(data.cbegin(), N14);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_emplace_value_begin)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.emplace(compare_data.begin(), N14.value);
      DataNDC::iterator      position  = data.emplace(data.begin(), N14.value);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_insert_value_end)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.insert(compare_data.cend(), N14);
      DataNDC::iterator      position  = data.insert(data.cend(), N14);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_emplace_value_end)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.emplace(compare_data.end(), N14.value);
      DataNDC::iterator      position  = data.emplace(data.end(), N14.value);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_insert_value)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.insert(compare_data.cbegin() + 3, N14);
      DataNDC::iterator      position  = data.insert(data.cbegin() + 3, N14);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));

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

      cposition = compare_data.insert(compare_data.cbegin() + 4, N14);
      position  = data.insert(data.cbegin() + 4, N14);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_emplace_value)
    {
      Compare_Data compare_data(initial_data_under.begin(), initial_data_under.end());
      DataNDC      data(compare_data.begin(), compare_data.end());

      Compare_Data::iterator cposition = compare_data.emplace(compare_data.begin() + 3, N14.value);
      DataNDC::iterator      position  = data.emplace(data.begin() + 3, N14.value);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));

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

      cposition = compare_data.emplace(compare_data.begin() + 4, N14.value);
      position  = data.emplace(data.begin() + 4, N14.value);

      CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), cposition), std::distance(data.begin(), position));
    }

    //*************************************************************************
    TEST(test_emplace_default)
    {
      const int Initial = 1;
      const int Default = 2;

      struct S
      {
        S()
          : value(Default)
        {
        }

        S(int v)
          : value(v)
        {
        }

        bool operator==(const S& rhs) const
        {
          return value == rhs.value;
        }

        int value;
      };

      // First fill with Initial values.
      etl::deque<S, SIZE> data;
      data.resize(SIZE, S(Initial));
      data.clear();

      // Then emplace Default values.
      for (size_t i = 0; i < SIZE; ++i)
      {
        data.emplace(data.end());
      }

      // Compare with an array of default values.
      std::array<S, SIZE> compare_data;
      compare_data.fill(S());

      CHECK_TRUE(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_front_default)
    {
      const int Initial = 1;
      const int Default = 2;

      struct S
      {
        S()
          : value(Default)
        {
        }

        S(int v)
          : value(v)
        {
        }

        bool operator==(const S& rhs) const
        {
          return value == rhs.value;
        }

        int value;
      };

      // First fill with Initial values.
      etl::deque<S, SIZE> data;
      data.resize(SIZE, S(Initial));
      data.clear();

      // Then emplace Default values.
      for (size_t i = 0; i < SIZE; ++i)
      {
        data.emplace_front();
      }

      // Compare with an array of default values.
      std::array<S, SIZE> compare_data;
      compare_data.fill(S());

      CHECK_TRUE(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_back_default)
    {
      const int Initial = 1;
      const int Default = 2;

      struct S
      {
        S()
          : value(Default)
        {
        }

        S(int v)
          : value(v)
        {
        }

        bool operator==(const S& rhs) const
        {
          return value == rhs.value;
        }

        int value;
      };

      // First fill with Initial values.
      etl::deque<S, SIZE> data;
      data.resize(SIZE, S(Initial));
      data.clear();

      // Then emplace Default values.
      for (size_t i = 0; i < SIZE; ++i)
      {
        data.emplace_back();
      }

      // Compare with an array of default values.
      std::array<S, SIZE> compare_data;
      compare_data.fill(S());

      CHECK_TRUE(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_insert_n_value_position)
    {
      size_t max_insert = SIZE - initial_data_small.size();

      for (size_t insert_size = 1UL; insert_size <= max_insert; ++insert_size)
      {
        for (size_t offset = 0UL; offset <= initial_data_small.size(); ++offset)
        {
          Compare_Data compare_data(initial_data_small.begin(), initial_data_small.end());
          DataNDC      data(compare_data.begin(), compare_data.end());

          compare_data.insert(compare_data.cbegin() + static_cast<ptrdiff_t>(offset), insert_size, N14);
          data.insert(data.cbegin() + static_cast<ptrdiff_t>(offset), insert_size, N14);

          CHECK_EQUAL(compare_data.size(), data.size());
          CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
        }
      }
    }

    //*************************************************************************
    TEST(test_insert_n_value_excess)
    {
      DataNDC data(initial_data_under.begin(), initial_data_under.end());

      size_t insert_size = SIZE - initial_data_under.size() + 1;

      CHECK_THROW(data.insert(data.cbegin(), insert_size, N14), etl::deque_full);
      CHECK_THROW(data.insert(data.cend(), insert_size, N14), etl::deque_full);
      CHECK_THROW(data.insert(data.cbegin() + 6, insert_size, N14), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_insert_range)
    {
      size_t max_insert = SIZE - initial_data_small.size();

      for (size_t insert_size = 1UL; insert_size <= max_insert; ++insert_size)
      {
        Compare_Data range(insert_data.begin(), insert_data.begin() + static_cast<ptrdiff_t>(insert_size));

        for (size_t offset = 0UL; offset <= initial_data_small.size(); ++offset)
        {
          Compare_Data compare_data(initial_data_small.begin(), initial_data_small.end());
          DataNDC      data(blank_data.begin(), blank_data.end());
          data.assign(compare_data.begin(), compare_data.end());

          compare_data.insert(compare_data.cbegin() + static_cast<ptrdiff_t>(offset), range.begin(), range.end());
          data.insert(data.cbegin() + static_cast<ptrdiff_t>(offset), range.begin(), range.end());

          CHECK_EQUAL(compare_data.size(), std::distance(data.begin(), data.end()));
          CHECK_EQUAL(compare_data.size(), data.size());
          CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
        }
      }
    }

    //*************************************************************************
    TEST(test_insert_range_excess)
    {
      Compare_Data range = {N12, N13, N14, N15};
      DataNDC      data(initial_data_under.begin(), initial_data_under.end());

      CHECK_THROW(data.insert(data.cbegin(), range.begin(), range.end()), etl::deque_full);
      CHECK_THROW(data.insert(data.cend(), range.begin(), range.end()), etl::deque_full);
      CHECK_THROW(data.insert(data.cbegin() + 6, range.begin(), range.end()), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_erase_begin)
    {
      Compare_Data compare_data = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};
      DataNDC      data(compare_data.begin(), compare_data.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      DataNDC::const_iterator      i_next  = data.erase(data.cbegin());
      Compare_Data::const_iterator i_cnext = compare_data.erase(compare_data.cbegin());

      CHECK_EQUAL(DataNDC::difference_type(data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.cbegin(), i_cnext), std::distance(data.cbegin(), i_next));
    }

    //*************************************************************************
    TEST(test_erase_end)
    {
      Compare_Data compare_data = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};
      DataNDC      data(compare_data.begin(), compare_data.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      DataNDC::iterator i_erase = data.end() - 1;
      DataNDC::iterator i_next  = data.erase(i_erase);

      Compare_Data::const_iterator i_cerase = compare_data.cend() - 1U;
      Compare_Data::iterator       i_cnext  = compare_data.erase(i_cerase);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));
    }

    //*************************************************************************
    TEST(test_erase_middle)
    {
      std::vector<NDC> initial = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};

      Compare_Data compare_data(initial.begin(), initial.end());
      DataNDC      data(initial.begin(), initial.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      // Erase near beginning.
      DataNDC::const_iterator i_erase = data.begin() + 2;
      DataNDC::iterator       i_next  = data.erase(i_erase);

      Compare_Data::const_iterator i_cerase = compare_data.begin() + 2;
      Compare_Data::iterator       i_cnext  = compare_data.erase(i_cerase);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));

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

      // Cause rollover.
      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      // Erase near end.
      i_erase = data.begin() + 3;
      i_next  = data.erase(i_erase);

      i_cerase = compare_data.begin() + 3;
      i_cnext  = compare_data.erase(i_cerase);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));
    }

    //*************************************************************************
    TEST(test_erase_range_begin)
    {
      std::vector<NDC> initial = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};

      Compare_Data compare_data(initial.begin(), initial.end());
      DataNDC      data(initial.begin(), initial.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      DataNDC::iterator      i_next  = data.erase(data.cbegin(), data.cbegin() + 3);
      Compare_Data::iterator i_cnext = compare_data.erase(compare_data.cbegin(), compare_data.cbegin() + 3);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));
    }

    //*************************************************************************
    TEST(test_erase_range_end)
    {
      std::vector<NDC> initial = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};

      Compare_Data compare_data(initial.begin(), initial.end());
      DataNDC      data(initial.begin(), initial.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      DataNDC::iterator      i_next  = data.erase(data.cend() - 3, data.cend());
      Compare_Data::iterator i_cnext = compare_data.erase(compare_data.cend() - 3, compare_data.cend());

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));
    }

    //*************************************************************************
    TEST(test_erase_range_middle)
    {
      std::vector<NDC> initial = {N0, N0, N0, N0, N0, N0, N0, N0, N0, N1, N2, N3};

      Compare_Data compare_data(initial.begin(), initial.end());
      DataNDC      data(initial.begin(), initial.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      DataNDC::iterator      i_next  = data.erase(data.cbegin() + 1, data.cbegin() + 3);
      Compare_Data::iterator i_cnext = compare_data.erase(compare_data.cbegin() + 1, compare_data.cbegin() + 3);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));

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

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N4);
      data.push_back(N5);
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);
      data.push_back(N9);
      data.push_back(N10);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(N4);
      compare_data.push_back(N5);
      compare_data.push_back(N6);
      compare_data.push_back(N7);
      compare_data.push_back(N8);
      compare_data.push_back(N9);
      compare_data.push_back(N10);

      i_next  = data.erase(data.cbegin() + 3, data.cbegin() + 5);
      i_cnext = compare_data.erase(compare_data.cbegin() + 3, compare_data.cbegin() + 5);

      CHECK_EQUAL(DataNDC::difference_type(compare_data.size()), std::distance(data.begin(), data.end()));
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_cnext), std::distance(data.begin(), i_next));
    }

    //*************************************************************************
    TEST(test_push_back)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

      CHECK_NO_THROW(data.push_back(N1));
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 4, data.begin()));

      CHECK_NO_THROW(data.push_back(N2));
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 3, data.begin()));

      CHECK_NO_THROW(data.push_back(N3));
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 2, data.begin()));

      CHECK_NO_THROW(data.push_back(N4));
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 1, data.begin()));

      CHECK_NO_THROW(data.push_back(N5));
      CHECK_EQUAL(size_t(5), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_back)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

      CHECK_NO_THROW(data.emplace_back("1"));
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 4, data.begin()));

      CHECK_NO_THROW(data.emplace_back("2"));
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 3, data.begin()));

      CHECK_NO_THROW(data.emplace_back("3"));
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 2, data.begin()));

      CHECK_NO_THROW(data.emplace_back("4"));
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 1, data.begin()));

      CHECK_NO_THROW(data.emplace_back("5"));
      CHECK_EQUAL(size_t(5), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_back_return)
    {
      DataNDC data;

      data.emplace_back("24");
      auto& back = data.emplace_back("42");
      CHECK_EQUAL(back, data.back());
    }

    //*************************************************************************
    TEST(test_push_back_excess)
    {
      DataNDC data;

      for (size_t i = 0UL; i < SIZE; ++i)
      {
        CHECK_NO_THROW(data.push_back(N0));
      }

      CHECK_THROW(data.push_back(N999), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_pop_back)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

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

      data.pop_back();
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 1, data.begin()));

      data.pop_back();
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 2, data.begin()));

      data.pop_back();
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 3, data.begin()));

      data.pop_back();
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end() - 4, data.begin()));

      data.pop_back();
      CHECK_EQUAL(size_t(0), data.size());
    }

    //*************************************************************************
    TEST(test_pop_back_exception)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

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

      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();
      data.pop_back();

      CHECK_THROW(data.pop_back(), etl::deque_empty);
    }

    //*************************************************************************
    TEST(test_push_front)
    {
      Compare_Data compare_data = {N5, N4, N3, N2, N1};
      DataNDC      data;

      CHECK_NO_THROW(data.push_front(N1));
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin() + 4, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.push_front(N2));
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin() + 3, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.push_front(N3));
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin() + 2, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.push_front(N4));
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin() + 1, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.push_front(N5));
      CHECK_EQUAL(size_t(5), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_front)
    {
      Compare_Data compare_data = {N5, N4, N3, N2, N1};
      DataNDC      data;

      CHECK_NO_THROW(data.emplace_front("1"));
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin() + 4, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.emplace_front("2"));
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin() + 3, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.emplace_front("3"));
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin() + 2, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.emplace_front("4"));
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin() + 1, compare_data.end(), data.begin()));

      CHECK_NO_THROW(data.emplace_front("5"));
      CHECK_EQUAL(size_t(5), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_emplace_front_return)
    {
      DataNDC data;

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

    //*************************************************************************
    TEST(test_push_front_excess)
    {
      DataNDC data;

      for (size_t i = 0UL; i < SIZE; ++i)
      {
        CHECK_NO_THROW(data.push_front(N1));
      }

      CHECK_THROW(data.push_front(N999), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_pop_front_exception)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

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

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

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

    //*************************************************************************
    TEST(test_push_front_push_back)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

      CHECK_NO_THROW(data.push_back(N3));
      CHECK_NO_THROW(data.push_front(N2));
      CHECK_NO_THROW(data.push_back(N4));
      CHECK_NO_THROW(data.push_front(N1));
      CHECK_NO_THROW(data.push_back(N5));

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

    //*************************************************************************
    TEST(test_push_back_pop_front_push_back)
    {
      Compare_Data compare_data = {N6, N7, N8};
      DataNDC      data;

      data.push_back(N1);
      data.push_back(N2);
      data.push_back(N3);
      data.push_back(N4);
      data.push_back(N5);
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(N6);
      data.push_back(N7);
      data.push_back(N8);

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

    //*************************************************************************
    TEST(test_pop_front)
    {
      Compare_Data compare_data = {N1, N2, N3, N4, N5};
      DataNDC      data;

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

      data.pop_front();
      CHECK_EQUAL(size_t(4), data.size());
      CHECK(std::equal(compare_data.begin() + 1, compare_data.end(), data.begin()));

      data.pop_front();
      CHECK_EQUAL(size_t(3), data.size());
      CHECK(std::equal(compare_data.begin() + 2, compare_data.end(), data.begin()));

      data.pop_front();
      CHECK_EQUAL(size_t(2), data.size());
      CHECK(std::equal(compare_data.begin() + 3, compare_data.end(), data.begin()));

      data.pop_front();
      CHECK_EQUAL(size_t(1), data.size());
      CHECK(std::equal(compare_data.begin() + 4, compare_data.end(), data.begin()));

      data.pop_front();
      CHECK_EQUAL(size_t(0), data.size());
    }

    //*************************************************************************
    TEST(test_resize_up)
    {
      Compare_DataDC compare_data(initial_data_dc.begin(), initial_data_dc.end());
      DataDC         data(initial_data_dc.begin(), initial_data_dc.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(DC("14"));
      data.push_back(DC("15"));
      data.push_back(DC("16"));
      data.push_back(DC("17"));
      data.resize(SIZE);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(DC("14"));
      compare_data.push_back(DC("15"));
      compare_data.push_back(DC("16"));
      compare_data.push_back(DC("17"));
      compare_data.resize(SIZE);

      CHECK_EQUAL(size_t(SIZE), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_resize_down)
    {
      Compare_DataDC compare_data(initial_data_dc.begin(), initial_data_dc.end());
      DataDC         data(initial_data_dc.begin(), initial_data_dc.end());

      // Cause rollover.
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.push_back(DC("14"));
      data.push_back(DC("15"));
      data.push_back(DC("16"));
      data.push_back(DC("17"));
      data.resize(SIZE / 2);

      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.pop_front();
      compare_data.push_back(DC("14"));
      compare_data.push_back(DC("15"));
      compare_data.push_back(DC("16"));
      compare_data.push_back(DC("17"));
      compare_data.resize(SIZE / 2);

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_resize_value)
    {
      Compare_Data compare_data = {N1, N2, N3, N3, N3};
      DataNDC      data;

      data.push_front(N1);
      data.push_back(N2);
      data.resize(SIZE, N3);

      CHECK_EQUAL(size_t(SIZE), data.size());
      CHECK(std::equal(compare_data.begin(), compare_data.end(), data.begin()));
    }

    //*************************************************************************
    TEST(test_resize_excess)
    {
      DataDC data;

      CHECK_THROW(data.resize(SIZE + 1), etl::deque_full);
    }

    //*************************************************************************
    TEST(test_equality_operator)
    {
      Compare_Data same      = {N1, N2, N3, N4, N5, N6};
      Compare_Data different = {N6, N5, N4, N3, N2, N1};

      DataNDC deque1(same.begin(), same.end());
      DataNDC deque2(deque1);

      CHECK(deque1 == deque2);

      // Change deque2's data.
      std::copy(different.begin(), different.end(), deque2.begin());

      CHECK(!(deque1 == deque2));
    }

    //*************************************************************************
    TEST(test_inequality_operator)
    {
      Compare_Data same      = {N1, N2, N3, N4, N5, N6};
      Compare_Data different = {N6, N5, N4, N3, N2, N1};

      DataNDC deque1(same.begin(), same.end());
      DataNDC deque2(deque1);

      CHECK(!(deque1 != deque2));

      // Change deque2's data.
      std::copy(different.begin(), different.end(), deque2.begin());

      CHECK(deque1 != deque2);
    }

    //*************************************************************************
    TEST(test_iterator_comparison_empty)
    {
      DataNDC data;

      CHECK(data.begin() == data.end());
      CHECK(data.cbegin() == data.cend());
      CHECK(data.rbegin() == data.rend());
      CHECK(data.crbegin() == data.crend());
    }

    //*************************************************************************
    TEST(test_memcpy_repair)
    {
      DataInt data(int_data1.begin(), int_data1.end());
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.insert(data.end(), int_data2.begin(), int_data2.end());

      char buffer[sizeof(DataInt)];

      memcpy(&buffer, (const void*)&data, sizeof(data));

      DataInt& rdata(*reinterpret_cast<DataInt*>(buffer));
      rdata.repair();

      // Check that the memcpy'd vector is the same.
      CHECK_EQUAL(data.size(), rdata.size());
      CHECK(!rdata.empty());
      CHECK(rdata.full());

      bool is_equal = std::equal(rdata.begin(), rdata.end(), data.begin());

      CHECK(is_equal);

      // Modify the original and check that the memcpy'd vector is not the same.
      std::reverse(data.begin(), data.end());

      is_equal = std::equal(rdata.begin(), rdata.end(), data.begin());

      CHECK(!is_equal);
    }

    //*************************************************************************
    TEST(test_memcpy_repair_virtual)
    {
      DataInt data(int_data1.begin(), int_data1.end());
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.pop_front();
      data.insert(data.end(), int_data2.begin(), int_data2.end());

      char buffer[sizeof(DataInt)];

      memcpy(&buffer, (const void*)&data, sizeof(data));

      IDataInt& idata(*reinterpret_cast<DataInt*>(buffer));
      idata.repair();

      // Check that the memcpy'd vector is the same.
      CHECK_EQUAL(data.size(), idata.size());
      CHECK(!idata.empty());
      CHECK(idata.full());

      bool is_equal = std::equal(idata.begin(), idata.end(), data.begin());

      CHECK(is_equal);

      // Modify the original and check that the memcpy'd vector is not the same.
      std::reverse(data.begin(), data.end());

      is_equal = std::equal(idata.begin(), idata.end(), data.begin());

      CHECK(!is_equal);
    }

    //*************************************************************************
    TEST(test_move)
    {
      typedef etl::deque<std::unique_ptr<uint32_t>, SIZE> Data;

      Data data1;

      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));
      std::unique_ptr<uint32_t> p5(new uint32_t(5U));

      // Move items to data1.
      data1.push_front(std::move(p1));
      data1.push_back(std::move(p2));
      data1.insert(data1.begin(), std::move(p3));
      data1.insert(data1.begin() + 1, std::move(p4));
      data1.insert(data1.end(), std::move(p5));

      const size_t ACTUAL_SIZE = data1.size();

      CHECK(!bool(p1));
      CHECK(!bool(p2));
      CHECK(!bool(p3));
      CHECK(!bool(p4));
      CHECK(!bool(p5));

      CHECK_EQUAL(3U, *(*(data1.begin() + 0)));
      CHECK_EQUAL(4U, *(*(data1.begin() + 1)));
      CHECK_EQUAL(1U, *(*(data1.begin() + 2)));
      CHECK_EQUAL(2U, *(*(data1.begin() + 3)));
      CHECK_EQUAL(5U, *(*(data1.begin() + 4)));

      // Move constructor.
      Data data2(std::move(data1));

      CHECK_EQUAL(3U, *(*(data2.begin() + 0)));
      CHECK_EQUAL(4U, *(*(data2.begin() + 1)));
      CHECK_EQUAL(1U, *(*(data2.begin() + 2)));
      CHECK_EQUAL(2U, *(*(data2.begin() + 3)));
      CHECK_EQUAL(5U, *(*(data2.begin() + 4)));

      CHECK_EQUAL(ACTUAL_SIZE, data2.size());

      // Move assignment.
      Data data3;
      data3 = std::move(data2);

      CHECK_EQUAL(3U, *(*(data3.begin() + 0)));
      CHECK_EQUAL(4U, *(*(data3.begin() + 1)));
      CHECK_EQUAL(1U, *(*(data3.begin() + 2)));
      CHECK_EQUAL(2U, *(*(data3.begin() + 3)));
      CHECK_EQUAL(5U, *(*(data3.begin() + 4)));

      CHECK_EQUAL(ACTUAL_SIZE, data3.size());
    }

    //*************************************************************************
    TEST(test_two_parameter_constructor_same_type_not_iterator)
    {
      // No compilation error.
      etl::deque<int, 10> v(5, 5);
    }

    //*************************************************************************
    TEST(test_sort)
    {
      std::array<int, 10> initial = {9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
      std::array<int, 10> result  = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

      etl::deque<int, 10> data(initial.begin(), initial.end());
      std::sort(data.begin(), data.end());

      bool is_equal = std::equal(data.begin(), data.end(), result.begin());

      CHECK(is_equal);
    }

    //*************************************************************************
#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    TEST(test_deque_template_deduction)
    {
      etl::deque data{char(0), short(1), 2, long(3), 4, 5, 6, 7, 8, 9};

      using Type = std::remove_reference_t<decltype(data[0])>;
      CHECK((std::is_same_v<long, Type>));

      CHECK_EQUAL(0, data[0]);
      CHECK_EQUAL(1, data[1]);
      CHECK_EQUAL(2, data[2]);
      CHECK_EQUAL(3, data[3]);
      CHECK_EQUAL(4, data[4]);
      CHECK_EQUAL(5, data[5]);
      CHECK_EQUAL(6, data[6]);
      CHECK_EQUAL(7, data[7]);
      CHECK_EQUAL(8, data[8]);
      CHECK_EQUAL(9, data[9]);
    }
#endif

    //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
    TEST(test_make_deque)
    {
      auto data = etl::make_deque<int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);

      CHECK_EQUAL(0, data[0]);
      CHECK_EQUAL(1, data[1]);
      CHECK_EQUAL(2, data[2]);
      CHECK_EQUAL(3, data[3]);
      CHECK_EQUAL(4, data[4]);
      CHECK_EQUAL(5, data[5]);
      CHECK_EQUAL(6, data[6]);
      CHECK_EQUAL(7, data[7]);
      CHECK_EQUAL(8, data[8]);
      CHECK_EQUAL(9, data[9]);
    }
#endif

    //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
    // Arguments that are const-qualified lvalues of the element type used to be rejected:
    // the old implementation forwarded each argument as T, and forward<T> cannot accept a
    // const T lvalue (it requires a non-const T&, and T&& cannot bind to a reference-related
    // const lvalue).
    TEST(test_make_deque_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_deque<char>(static_const_lvalue, local_const_lvalue, mutable_lvalue);

      using Type = etl::remove_reference_t<decltype(data[0])>;
      CHECK((std::is_same<char, Type>::value));

      CHECK_EQUAL(42, data[0]);
      CHECK_EQUAL(43, data[1]);
      CHECK_EQUAL(44, data[2]);
    }
#endif

    //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
    // The arguments are converted to the element type with static_cast, so narrowing
    // initialisers (int literals and int lvalues narrowed to char) must keep working.
    // Plain forwarding into the braced initialiser list would reject them.
    TEST(test_make_deque_from_narrowing_values)
    {
      static const int static_const_int = 45;
      const int        local_const_int  = 46;
      int              mutable_int      = 47;

      auto data = etl::make_deque<char>(0, 1, static_const_int, local_const_int, mutable_int);

      using Type = etl::remove_reference_t<decltype(data[0])>;
      CHECK((std::is_same<char, Type>::value));

      CHECK_EQUAL(0, data[0]);
      CHECK_EQUAL(1, data[1]);
      CHECK_EQUAL(45, data[2]);
      CHECK_EQUAL(46, data[3]);
      CHECK_EQUAL(47, data[4]);
    }
#endif

    //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
    // With no explicit element type, the element type is deduced as the
    // decayed common type of the arguments (Library Fundamentals TS
    // make_array design).
    TEST(test_make_deque_deduced_element_type)
    {
      static const int static_const_lvalue = 1;

      auto data = etl::make_deque(static_const_lvalue, 2L, 3);

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

      CHECK_EQUAL(1L, data[0]);
      CHECK_EQUAL(2L, data[1]);
      CHECK_EQUAL(3L, data[2]);
    }
#endif

    //*************************************************************************
    TEST(test_fill)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      data.fill(N999);

#include "etl/private/diagnostic_uninitialized_push.h"
      CHECK(std::equal(blank_data.begin(), blank_data.end(), data.begin()));
#include "etl/private/diagnostic_pop.h"
    }

    //*************************************************************************
    TEST(test_const_iterator_subscript)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      const DataNDC& cdata = data;

      // Access via const_iterator operator[]
      DataNDC::const_iterator cit = cdata.begin();

#include "etl/private/diagnostic_uninitialized_push.h"
      // Verify operator[] returns values matching sequential access
      DataNDC::difference_type it_idx = 0;
      for (size_t i = 0; i < cdata.size(); ++i, ++it_idx)
      {
        CHECK(cit[it_idx] == cdata[i]);
      }

      // Verify const_iterator operator[] returns const_reference
      // (This is a compile-time check - if the fix is reverted,
      //  the type would be non-const reference which is incorrect for const_iterator)
      const NDC& ref = cit[0];
      CHECK(ref == cdata[0]);
#include "etl/private/diagnostic_pop.h"
    }
  }
} // namespace

#include "etl/private/diagnostic_pop.h"