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

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

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

Copyright(c) 2016 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
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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******************************************************************************/

#include "unit_test_framework.h"

#include <set>
#include <array>
#include <algorithm>
#include <utility>
#include <iterator>
#include <string>
#include <vector>
#include <numeric>
#include <unordered_set>

#include "data.h"

#include "etl/unordered_multiset.h"
#include "etl/checksum.h"

namespace
{
  typedef TestDataDC<std::string>  DC;
  typedef TestDataNDC<std::string> NDC;
}

namespace etl
{
  template <>
  struct hash<NDC>
  {
    size_t operator ()(const NDC& e) const
    {
      size_t sum = 0U;
      return std::accumulate(e.value.begin(), e.value.end(), sum);
    }
  };
}

namespace
{
  //***************************************************************************
  struct CustomHashFunction
  {
    CustomHashFunction()
      : id(0)
    {
    }

    CustomHashFunction(int id_)
      : id(id_)
    {
    }

    size_t operator ()(uint32_t e) const
    {
      return size_t(e);
    }

    int id;
  };

  //***************************************************************************
  struct CustomKeyEq
  {
    CustomKeyEq()
      : id(0)
    {
    }

    CustomKeyEq(int id_)
      : id(id_)
    {
    }

    size_t operator ()(uint32_t lhs, uint32_t rhs) const
    {
      return (lhs == rhs);
    }

    int id;
  };

  //*************************************************************************
  // Hasher whose hash behaviour depends on provided data.
  struct parameterized_hash
  {
    size_t modulus;

    parameterized_hash(size_t modulus_ = 2) : modulus(modulus_){}

    size_t operator()(size_t val) const
    {
      return val % modulus;
    }
  };

  //*************************************************************************
  // Equality checker whose behaviour depends on provided data.
  struct parameterized_equal
  {
    size_t modulus;

    // Hasher whose hash behaviour depends on provided data.
    parameterized_equal(size_t modulus_ = 2) : modulus(modulus_){}

    bool operator()(size_t lhs, size_t rhs) const
    {
      return (lhs % modulus) == (rhs % modulus);
    }
  };

  SUITE(test_unordered_multiset)
  {
    static const size_t SIZE = 10;

    using ItemM = TestDataM<int>;

    struct simple_hash
    {
      size_t operator ()(const NDC& value) const
      {
        return etl::checksum<size_t>(value.value.begin(), value.value.end());
      }

      size_t operator ()(const ItemM& value) const
      {
        etl::checksum<size_t> sum;

        sum.add(value.valid);
        sum.add(value.value);

        return sum.value();
      }
    };

    using DataM = etl::unordered_multiset<ItemM, SIZE, SIZE, simple_hash>;

    typedef etl::unordered_multiset<DC,  SIZE, SIZE / 2, simple_hash> DataDC;
    typedef etl::unordered_multiset<NDC, SIZE, SIZE / 2, simple_hash> DataNDC;
    typedef etl::iunordered_multiset<NDC, simple_hash>      IDataNDC;

    NDC N0  = NDC("FF");
    NDC N1  = NDC("FG");
    NDC N2  = NDC("FH");
    NDC N3  = NDC("FI");
    NDC N4  = NDC("FJ");
    NDC N5  = NDC("FK");
    NDC N6  = NDC("FL");
    NDC N7  = NDC("FM");
    NDC N8  = NDC("FN");
    NDC N9  = NDC("FO");
    NDC N10 = NDC("FP");
    NDC N11 = NDC("FQ");
    NDC N12 = NDC("FR");
    NDC N13 = NDC("FS");
    NDC N14 = NDC("FT");
    NDC N15 = NDC("FU");
    NDC N16 = NDC("FV");
    NDC N17 = NDC("FW");
    NDC N18 = NDC("FX");
    NDC N19 = NDC("FY");

    std::vector<NDC> initial_data;
    std::vector<NDC> excess_data;
    std::vector<NDC> different_data;
    std::vector<NDC> equal_data;

    //*************************************************************************
    struct SetupFixture
    {
      SetupFixture()
      {
        NDC n[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9
        };

        NDC n2[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10
        };

        NDC n3[] =
        {
          N10, N11, N12, N13, N14, N15, N16, N17, N18, N19
        };

        NDC n4[] =
        {
          N0, N1, N1, N1, N2
        };

        initial_data.assign(std::begin(n), std::end(n));
        excess_data.assign(std::begin(n2), std::end(n2));
        different_data.assign(std::begin(n3), std::end(n3));
        equal_data.assign(std::begin(n4), std::end(n4));
      }
    };

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

      CHECK_EQUAL(data.size(), size_t(0));
      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_FIXTURE(SetupFixture, test_cpp17_deduced_constructor)
    {
      etl::unordered_multiset data{ N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };
      etl::unordered_multiset<NDC, 10U> check = { N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };

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

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_range)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK(data.size() == SIZE);
      CHECK(!data.empty());
      CHECK(data.full());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_constructor)
    {
      DataM data1;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data1.insert(etl::move(d1));
      data1.insert(etl::move(d2));
      data1.insert(etl::move(d3));
      data1.insert(ItemM(4));

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

      CHECK(!data1.empty()); // Move does not clear the source.

      CHECK(data2.find(ItemM(1)) != data2.end());
      CHECK(data2.find(ItemM(2)) != data2.end());
      CHECK(data2.find(ItemM(3)) != data2.end());
      CHECK(data2.find(ItemM(4)) != data2.end());

      CHECK(data2.find(ItemM(1))->valid);
      CHECK(data2.find(ItemM(2))->valid);
      CHECK(data2.find(ItemM(3))->valid);
      CHECK(data2.find(ItemM(4))->valid);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_destruct_via_iunordered_multiset)
    {
      int current_count = NDC::get_instance_count();

      DataNDC* pdata = new DataNDC(initial_data.begin(), initial_data.end());

      IDataNDC* pidata = pdata;
      delete pidata;

      CHECK_EQUAL(current_count, NDC::get_instance_count());
    }

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

      other_data = data;

      CHECK(data == other_data);
    }

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

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

      idata2 = idata1;

      CHECK(data1 == data2);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_self_assignment)
    {
      DataNDC data(initial_data.begin(), initial_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(data == other_data);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_assignment)
    {
      DataM data1;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data1.insert(etl::move(d1));
      data1.insert(etl::move(d2));
      data1.insert(etl::move(d3));
      data1.insert(ItemM(4));

      DataM data2;
      data2.insert(ItemM(5));

      data2 = std::move(data1);

      CHECK(!data1.empty()); // Move does not clear the source.
    }

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

      CHECK(!data.full());
      CHECK(data.empty());

      data.insert(initial_data.begin(), initial_data.end());

      CHECK(data.full());
      CHECK(!data.empty());
    }

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

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

      DataNDC::iterator idata;

      for (size_t i = 0UL; i < 10; ++i)
      {
        idata = data.find(initial_data[i]);
        CHECK(idata != data.end());
      }
    }

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

      data.insert(N0);  // Inserted
      data.insert(N2);  // Inserted
      data.insert(N1);  // Inserted
      data.insert(N11); // Duplicate hash. Inserted
      data.insert(N1);  // Duplicate. Inserted

      CHECK_EQUAL(5U, data.size());

      DataNDC::iterator idata;

      idata = data.find(N0);
      CHECK(idata != data.end());
      CHECK(*idata == N0);

      idata = data.find(N1);
      CHECK(idata != data.end());
      CHECK(*idata == N1);

      // The other value with key == N1
      ++idata;
      CHECK(idata != data.end());
      CHECK(*idata == N1);

      idata = data.find(N2);
      CHECK(idata != data.end());
      CHECK(*idata == N2);

      idata = data.find(N11);
      CHECK(idata != data.end());
      CHECK(*idata == N11);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value_excess)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data.insert(N10), etl::unordered_multiset_full);
    }

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

      data.insert(initial_data.begin(), initial_data.end());

      for (size_t i = 0UL; i < data.size(); ++i)
      {
        DataNDC::iterator idata = data.find(initial_data[i]);
        CHECK(idata != data.end());
      }
    }

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

      CHECK_THROW(data.insert(excess_data.begin(), excess_data.end()), etl::unordered_multiset_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_moved_value)
    {
      DataM data;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data.insert(etl::move(d1));
      data.insert(etl::move(d2));
      data.insert(etl::move(d3));
      data.insert(ItemM(4));

      CHECK(!bool(d1));
      CHECK(!bool(d2));
      CHECK(!bool(d3));

      CHECK_EQUAL(1, data.find(ItemM(1))->value);
      CHECK_EQUAL(2, data.find(ItemM(2))->value);
      CHECK_EQUAL(3, data.find(ItemM(3))->value);
      CHECK_EQUAL(4, data.find(ItemM(4))->value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_key)
    {
      DataNDC data(equal_data.begin(), equal_data.end());

      size_t count = data.erase(N0);

      CHECK_EQUAL(1U, count);

      DataNDC::iterator idata = data.find(N0);
      CHECK(idata == data.end());

      count = data.erase(N1);

      CHECK_EQUAL(3U, count);

      idata = data.find(N1);
      CHECK(idata == data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_iterator)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::iterator idata = data.find(N5);
      DataNDC::iterator inext = idata;
      ++inext;

      DataNDC::iterator iafter = data.erase(idata);
      idata = data.find(N5);

      CHECK(idata == data.end());
      CHECK(inext == iafter);

      // Test that erase really does erase from the pool.
      CHECK(!data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_cont_iterator)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator idata = data.find(N5);
      DataNDC::const_iterator inext = idata;
      ++inext;

      DataNDC::const_iterator iafter = data.erase(idata);
      idata = data.find(N5);

      CHECK(idata == data.cend());
      CHECK(inext == iafter);

      // Test that erase really does erase from the pool.
      CHECK(!data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator idata = data.cbegin();
      std::advance(idata, 2);

      DataNDC::const_iterator idata_end = data.cbegin();
      std::advance(idata_end, 5);

      data.erase(idata, idata_end);

      CHECK_EQUAL(initial_data.size() - 3, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());

      idata = data.find(N8);
      CHECK(idata != data.end());

      idata = data.find(N0);
      CHECK(idata != data.end());

      idata = data.find(N1);
      CHECK(idata == data.end());

      idata = data.find(N2);
      CHECK(idata == data.end());

      idata = data.find(N3);
      CHECK(idata != data.end());

      idata = data.find(N4);
      CHECK(idata != data.end());

      idata = data.find(N5);
      CHECK(idata != data.end());

      idata = data.find(N6);
      CHECK(idata == data.end());

      idata = data.find(N7);
      CHECK(idata != data.end());

      idata = data.find(N8);
      CHECK(idata != data.end());

      idata = data.find(N9);
      CHECK(idata != data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_first_half)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator end = data.cbegin();
      etl::advance(end, data.size() / 2);

      auto itr = data.erase(data.cbegin(), end);

      CHECK_EQUAL(initial_data.size() / 2, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());
      CHECK(itr == end);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_last_half)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator begin = data.cbegin();
      etl::advance(begin, data.size() / 2);

      auto itr = data.erase(begin, data.cend());

      CHECK_EQUAL(initial_data.size() / 2, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());
      CHECK(itr == data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_all)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      auto itr = data.erase(data.cbegin(), data.cend());

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

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

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

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_count_key)
    {
      DataNDC data(equal_data.begin(), equal_data.end());

      size_t count = data.count(N0);
      CHECK_EQUAL(1U, count);

      count = data.count(N1);
      CHECK_EQUAL(3U, count);

      count = data.count(N10);
      CHECK_EQUAL(0U, count);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_const)
    {
      const DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator idata = data.find(N3);

      CHECK(idata != data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range)
    {
      DataNDC data(equal_data.begin(), equal_data.end());

      ETL_OR_STD::pair<DataNDC::iterator, DataNDC::iterator> result;

      result = data.equal_range(N0);
      CHECK(result.first == data.begin());
      CHECK(result.second != data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 1);
      CHECK_EQUAL(*result.first, N0);

      result = data.equal_range(N1);
      CHECK(result.first != data.begin());
      CHECK(result.second != data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 3);
      CHECK_EQUAL(*result.first, N1);

      result = data.equal_range(N2);
      CHECK(result.first != data.begin());
      CHECK(result.second == data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 1);
      CHECK_EQUAL(*result.first, N2);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range_const)
    {
      const DataNDC data(equal_data.begin(), equal_data.end());

      ETL_OR_STD::pair<DataNDC::const_iterator, DataNDC::const_iterator> result;

      result = data.equal_range(N0);
      CHECK(result.first == data.begin());
      CHECK(result.second != data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 1);
      CHECK_EQUAL(*result.first, N0);

      result = data.equal_range(N1);
      CHECK(result.first != data.begin());
      CHECK(result.second != data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 3);
      CHECK_EQUAL(*result.first, N1);

      result = data.equal_range(N2);
      CHECK(result.first != data.begin());
      CHECK(result.second == data.end());
      CHECK_EQUAL(std::distance(result.first, result.second), 1);
      CHECK_EQUAL(*result.first, N2);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(initial1 == initial2);

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(!(initial1 == different));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_not_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(!(initial1 != initial2));

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(initial1 != different);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_hash_function)
    {
      DataNDC data;
      DataNDC::hasher hash_function =  data.hash_function();

      CHECK_EQUAL(simple_hash()(NDC(std::string("ABCDEF"))), hash_function(NDC(std::string("ABCDEF"))));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_key_eq_function)
    {
      DataNDC data;
      DataNDC::key_equal key_eq = data.key_eq();

      CHECK(key_eq(NDC(std::string("ABCDEF")), NDC(std::string("ABCDEF"))));
      CHECK(!key_eq(NDC(std::string("ABCDEF")), NDC(std::string("ABCDEG"))));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_load_factor)
    {
      // Empty.
      DataNDC data;
      CHECK_CLOSE(0.0, data.load_factor(), 0.01);

      // Half the buckets used.
      data.assign(initial_data.begin(), initial_data.begin() + (initial_data.size() / 4));
      CHECK_CLOSE(0.4, data.load_factor(), 0.01);

      // All of the buckets used.
      data.clear();
      data.assign(initial_data.begin(), initial_data.end());
      CHECK_CLOSE(2.0, data.load_factor(), 0.01);
    }

    //*************************************************************************
    TEST(test_equality_comparison_fails_when_hash_collisions_occur_582)
    {
      struct bad_hash
      {
        // Force hash collisions
        size_t operator()(int key) const
        {
          return key % 4;
        }
      };

      std::vector<int> random_keys1 = { 17, 14, 3,  7, 2, 6, 9,  3, 18, 10,  8, 11,  4, 1, 12, 15, 16,  0,  5, 19 };
      std::vector<int> random_keys2 = { 3,  6, 5, 17, 2, 7, 3, 19,  8, 15, 14,  0, 18, 4, 10,  9, 16, 11, 12,  1 };

      // Check that the input data is valid.
      CHECK_EQUAL(random_keys1.size(), random_keys2.size());
      CHECK(std::is_permutation(random_keys1.begin(), random_keys1.end(), random_keys2.begin()));

      //***************************************************
      // Fill ETL
      etl::unordered_multiset<int, 20, 20, bad_hash> etlset1;
      etl::unordered_multiset<int, 20, 20, bad_hash> etlset2;

      for (auto i : random_keys1)
      {
        etlset1.insert(i);
      }

      for (auto i : random_keys2)
      {
        etlset2.insert(i);
      }

      //***************************************************
      // Fill STD
      std::unordered_multiset<int, bad_hash> stdset1;
      std::unordered_multiset<int, bad_hash> stdset2;

      for (auto i : random_keys1)
      {
        stdset1.insert(i);
      }

      for (auto i : random_keys2)
      {
        stdset2.insert(i);
      }

      //***************************************************
      CHECK_EQUAL((stdset1 == stdset2), (etlset1 == etlset2));
    }

    //*************************************************************************
    TEST(test_copying_of_hash_and_key_compare_with_copy_construct)
    {
      CustomHashFunction chf(1);
      CustomKeyEq        ceq(2);

      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set1(chf, ceq);
      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set2(set1);

      CHECK_EQUAL(chf.id, set2.hash_function().id);
      CHECK_EQUAL(ceq.id, set2.key_eq().id);
    }

    //*************************************************************************
    TEST(test_copying_of_hash_and_key_compare_with_assignment)
    {
      CustomHashFunction chf1(1);
      CustomKeyEq        ceq2(2);

      CustomHashFunction chf3(3);
      CustomKeyEq        ceq4(4);

      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set1(chf1, ceq2);
      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set2(chf3, ceq4);

      set2.operator=(set1);

      CHECK_EQUAL(chf1.id, set2.hash_function().id);
      CHECK_EQUAL(ceq2.id, set2.key_eq().id);
    }

    //*************************************************************************
    TEST(test_copying_of_hash_and_key_compare_with_construction_from_iterators)
    {
      CustomHashFunction chf1(1);
      CustomKeyEq        ceq2(2);

      std::array<uint32_t, 5> data = { 1, 2, 3, 4, 5 };

      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set1(data.begin(), data.end(), chf1, ceq2);

      CHECK_EQUAL(chf1.id, set1.hash_function().id);
      CHECK_EQUAL(ceq2.id, set1.key_eq().id);
    }

    //*************************************************************************
    TEST(test_copying_of_hash_and_key_compare_with_construction_from_initializer_list)
    {
      CustomHashFunction chf1(1);
      CustomKeyEq        ceq2(2);

      etl::unordered_multiset<uint32_t, 5, 5, CustomHashFunction, CustomKeyEq> set1({ 1, 2, 3, 4, 5 }, chf1, ceq2);

      CHECK_EQUAL(chf1.id, set1.hash_function().id);
      CHECK_EQUAL(ceq2.id, set1.key_eq().id);
    }

    //*************************************************************************
    TEST(test_iterator_value_types_bug_584)
    {
      using Set = etl::unordered_multiset<int, 1, 1>;
      CHECK((!std::is_same<typename Set::const_iterator::value_type, typename Set::iterator::value_type>::value));
    }

    TEST(test_parameterized_eq)
    {
      constexpr std::size_t MODULO = 4;
      parameterized_hash hash{MODULO};
      parameterized_equal eq{MODULO};
      // values are equal modulo 4
      etl::unordered_multiset<std::size_t, 10, 10, parameterized_hash, parameterized_equal> set;
      set.insert(2);
      set.insert(6);
      set.insert(10);

      const auto& constset = set;

      CHECK_EQUAL(constset.count(6), 3);
      {
        auto range = set.equal_range(6);
        CHECK_EQUAL(std::distance(range.first, range.second), 3);
      }
      {
        auto range = constset.equal_range(6);
        CHECK_EQUAL(std::distance(range.first, range.second), 3);
      }
    }

    //*************************************************************************
    TEST(test_iterator_value_types_bug_803)
    {
      using Set1 = etl::unordered_multiset<NDC, SIZE, 5>;
      using Set2 = etl::unordered_multiset<NDC, 2 * SIZE, 10>;

      Set1 set1(initial_data.begin(), initial_data.end());
      Set2 set2a(initial_data.begin(), initial_data.end());
      Set2 set2b(different_data.begin(), different_data.end());

      CHECK_TRUE(set1 == set2a);
      CHECK_FALSE(set1 == set2b);
    }
  };
}