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 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   1. Redistributions of source code must retain the above copyright

  *      notice, this list of conditions and the following disclaimer.

  *

  *   2. Redistributions in binary form must reproduce the above copyright

  *      notice, this list of conditions and the following disclaimer in the

  *      documentation and/or other materials provided with the distribution.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

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  */

 #include "cx/linked_list.h"

 #include "cx/array_list.h"

 #include "cx/utils.h"

 #include "cx/compare.h"

 #include "util_allocator.h"

 #include <gtest/gtest.h>

 #include <array>

 #include <vector>

 #include <unordered_set>

 #include <algorithm>

 struct node {

     node *next = nullptr;

     node *prev = nullptr;

     int data = 0;

 };

 const ptrdiff_t loc_prev = offsetof(struct node, prev);

 const ptrdiff_t loc_next = offsetof(struct node, next);

 const ptrdiff_t loc_data = offsetof(struct node, data);

 struct node_test_data {

     node *begin = nullptr;

     explicit node_test_data(node *begin) : begin(begin) {

         auto n = begin;

         while (n != nullptr) {

             nodes.push_back(n);

             n = n->next;

         }

     }

     node_test_data(node_test_data &) = delete;

     node_test_data(node_test_data &&) = default;

     ~node_test_data() {

         for (auto &&n: nodes) delete n;

     }

 private:

     std::vector<node *> nodes;

 };

 static node_test_data create_nodes_test_data(size_t len) {

     if (len == 0) return node_test_data{nullptr};

     auto begin = new node;

     auto prev = begin;

     for (size_t i = 1; i < len; i++) {

         auto n = new node;

         cx_linked_list_link(prev, n, loc_prev, loc_next);

         prev = n;

     }

     return node_test_data{begin};

 }

 template<typename InputIter>

 static node_test_data create_nodes_test_data(

         InputIter begin,

         InputIter end

 ) {

     if (begin == end) return node_test_data{nullptr};

     node *first = new node;

     first->data = *begin;

     node *prev = first;

     begin++;

     for (; begin != end; begin++) {

         auto n = new node;

         n->data = *begin;

         cx_linked_list_link(prev, n, loc_prev, loc_next);

         prev = n;

     }

     return node_test_data{first};

 }

 static node_test_data create_nodes_test_data(std::initializer_list<int> data) {

     return create_nodes_test_data(data.begin(), data.end());

 }

 template<size_t N>

 struct int_test_data {

     std::array<int, N> data;

     int_test_data() {

         cx_for_n (i, N) data[i] = ::rand(); // NOLINT(cert-msc50-cpp)

     }

 };

 TEST(LinkedList_LowLevel, link_unlink) {

     node a, b, c;

     cx_linked_list_link(&a, &b, loc_prev, loc_next);

     EXPECT_EQ(a.prev, nullptr);

     EXPECT_EQ(a.next, &b);

     EXPECT_EQ(b.prev, &a);

     EXPECT_EQ(b.next, nullptr);

     cx_linked_list_unlink(&a, &b, loc_prev, loc_next);

     EXPECT_EQ(a.prev, nullptr);

     EXPECT_EQ(a.next, nullptr);

     EXPECT_EQ(b.prev, nullptr);

     EXPECT_EQ(b.next, nullptr);

     cx_linked_list_link(&b, &c, loc_prev, loc_next);

     cx_linked_list_link(&a, &b, loc_prev, loc_next);

     cx_linked_list_unlink(&b, &c, loc_prev, loc_next);

     EXPECT_EQ(a.prev, nullptr);

     EXPECT_EQ(a.next, &b);

     EXPECT_EQ(b.prev, &a);

     EXPECT_EQ(b.next, nullptr);

     EXPECT_EQ(c.prev, nullptr);

     EXPECT_EQ(c.next, nullptr);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_at) {

     node a, b, c, d;

     cx_linked_list_link(&a, &b, loc_prev, loc_next);

     cx_linked_list_link(&b, &c, loc_prev, loc_next);

     cx_linked_list_link(&c, &d, loc_prev, loc_next);

     EXPECT_EQ(cx_linked_list_at(&a, 0, loc_next, 0), &a);

     EXPECT_EQ(cx_linked_list_at(&a, 0, loc_next, 1), &b);

     EXPECT_EQ(cx_linked_list_at(&a, 0, loc_next, 2), &c);

     EXPECT_EQ(cx_linked_list_at(&a, 0, loc_next, 3), &d);

     EXPECT_EQ(cx_linked_list_at(&a, 0, loc_next, 4), nullptr);

     EXPECT_EQ(cx_linked_list_at(&b, 1, loc_prev, 0), &a);

     EXPECT_EQ(cx_linked_list_at(&b, 1, loc_next, 1), &b);

     EXPECT_EQ(cx_linked_list_at(&b, 1, loc_next, 2), &c);

     EXPECT_EQ(cx_linked_list_at(&b, 1, loc_next, 3), &d);

     EXPECT_EQ(cx_linked_list_at(&b, 1, loc_next, 4), nullptr);

     EXPECT_EQ(cx_linked_list_at(&d, 3, loc_prev, 0), &a);

     EXPECT_EQ(cx_linked_list_at(&d, 3, loc_prev, 1), &b);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_find) {

     auto testdata = create_nodes_test_data({2, 4, 6, 8});

     auto list = testdata.begin;

     int s;

     s = 2;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 0);

     s = 4;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 1);

     s = 6;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 2);

     s = 8;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 3);

     s = 10;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 4);

     s = -2;

     EXPECT_EQ(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s), 4);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_compare) {

     auto ta = create_nodes_test_data({2, 4, 6, 8});

     auto tb = create_nodes_test_data({2, 4, 6});

     auto tc = create_nodes_test_data({2, 4, 6, 9});

     auto la = ta.begin, lb = tb.begin, lc = tc.begin;

     EXPECT_GT(cx_linked_list_compare(la, lb, loc_next, loc_data, cx_cmp_int), 0);

     EXPECT_LT(cx_linked_list_compare(lb, la, loc_next, loc_data, cx_cmp_int), 0);

     EXPECT_GT(cx_linked_list_compare(lc, la, loc_next, loc_data, cx_cmp_int), 0);

     EXPECT_LT(cx_linked_list_compare(la, lc, loc_next, loc_data, cx_cmp_int), 0);

     EXPECT_EQ(cx_linked_list_compare(la, la, loc_next, loc_data, cx_cmp_int), 0);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_add) {

     // test with begin, end / prev, next

     {

         node nodes[4];

         void *begin = nullptr, *end = nullptr;

         cx_linked_list_add(&begin, &end, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[0].prev, nullptr);

         EXPECT_EQ(nodes[0].next, nullptr);

         cx_linked_list_add(&begin, &end, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[1]);

         EXPECT_EQ(nodes[0].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, &nodes[0]);

     }

     // test with begin only / prev, next

     {

         node nodes[4];

         void *begin = nullptr;

         cx_linked_list_add(&begin, nullptr, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         cx_linked_list_add(&begin, nullptr, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(nodes[0].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, &nodes[0]);

         cx_linked_list_add(&begin, nullptr, loc_prev, loc_next, &nodes[2]);

         EXPECT_EQ(nodes[1].next, &nodes[2]);

         EXPECT_EQ(nodes[2].prev, &nodes[1]);

     }

     // test with end only / prev, next

     {

         node nodes[4];

         void *end = nullptr;

         cx_linked_list_add(nullptr, &end, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         cx_linked_list_add(nullptr, &end, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(end, &nodes[1]);

         EXPECT_EQ(nodes[0].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, &nodes[0]);

         cx_linked_list_add(nullptr, &end, loc_prev, loc_next, &nodes[2]);

         EXPECT_EQ(end, &nodes[2]);

         EXPECT_EQ(nodes[1].next, &nodes[2]);

         EXPECT_EQ(nodes[2].prev, &nodes[1]);

     }

     // test with begin, end / next

     {

         node nodes[4];

         void *begin = nullptr, *end = nullptr;

         cx_linked_list_add(&begin, &end, -1, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         cx_linked_list_add(&begin, &end, -1, loc_next, &nodes[1]);

         EXPECT_EQ(end, &nodes[1]);

         EXPECT_EQ(nodes[0].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, nullptr);

     }

 }

 TEST(LinkedList_LowLevel, cx_linked_list_prepend) {

     // test with begin, end / prev, next

     {

         node nodes[4];

         void *begin = nullptr, *end = nullptr;

         cx_linked_list_prepend(&begin, &end, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[0].prev, nullptr);

         EXPECT_EQ(nodes[0].next, nullptr);

         cx_linked_list_prepend(&begin, &end, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(begin, &nodes[1]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[1].next, &nodes[0]);

         EXPECT_EQ(nodes[0].prev, &nodes[1]);

     }

     // test with begin only / prev, next

     {

         node nodes[4];

         void *begin = nullptr;

         cx_linked_list_prepend(&begin, nullptr, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         cx_linked_list_prepend(&begin, nullptr, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(begin, &nodes[1]);

         EXPECT_EQ(nodes[1].next, &nodes[0]);

         EXPECT_EQ(nodes[0].prev, &nodes[1]);

         cx_linked_list_prepend(&begin, nullptr, loc_prev, loc_next, &nodes[2]);

         EXPECT_EQ(begin, &nodes[2]);

         EXPECT_EQ(nodes[2].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, &nodes[2]);

     }

     // test with end only / prev, next

     {

         node nodes[4];

         void *end = nullptr;

         cx_linked_list_prepend(nullptr, &end, loc_prev, loc_next, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         cx_linked_list_prepend(nullptr, &end, loc_prev, loc_next, &nodes[1]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[1].next, &nodes[0]);

         EXPECT_EQ(nodes[0].prev, &nodes[1]);

         cx_linked_list_prepend(nullptr, &end, loc_prev, loc_next, &nodes[2]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[2].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, &nodes[2]);

     }

     // test with begin, end / next

     {

         node nodes[4];

         void *begin = nullptr, *end = nullptr;

         cx_linked_list_prepend(&begin, &end, -1, loc_next, &nodes[0]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[0]);

         cx_linked_list_prepend(&begin, &end, -1, loc_next, &nodes[1]);

         cx_linked_list_prepend(&begin, &end, -1, loc_next, &nodes[2]);

         EXPECT_EQ(begin, &nodes[2]);

         EXPECT_EQ(end, &nodes[0]);

         EXPECT_EQ(nodes[1].next, &nodes[0]);

         EXPECT_EQ(nodes[2].next, &nodes[1]);

         EXPECT_EQ(nodes[1].prev, nullptr);

         EXPECT_EQ(nodes[0].prev, nullptr);

     }

 }

 TEST(LinkedList_LowLevel, cx_linked_list_insert) {

     // insert mid list

     {

         node nodes[4];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_insert(&begin, &end, loc_prev, loc_next, &nodes[1], &nodes[3]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[2]);

         EXPECT_EQ(nodes[1].next, &nodes[3]);

         EXPECT_EQ(nodes[2].prev, &nodes[3]);

         EXPECT_EQ(nodes[3].prev, &nodes[1]);

         EXPECT_EQ(nodes[3].next, &nodes[2]);

     }

     // insert end

     {

         node nodes[4];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_insert(&begin, &end, loc_prev, loc_next, &nodes[2], &nodes[3]);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[3]);

         EXPECT_EQ(nodes[2].next, &nodes[3]);

         EXPECT_EQ(nodes[3].prev, &nodes[2]);

         EXPECT_EQ(nodes[3].next, nullptr);

     }

     // insert begin

     {

         node nodes[4];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_insert(&begin, &end, loc_prev, loc_next, nullptr, &nodes[3]);

         EXPECT_EQ(begin, &nodes[3]);

         EXPECT_EQ(end, &nodes[2]);

         EXPECT_EQ(nodes[0].prev, &nodes[3]);

         EXPECT_EQ(nodes[3].prev, nullptr);

         EXPECT_EQ(nodes[3].next, &nodes[0]);

     }

 }

 TEST(LinkedList_LowLevel, cx_linked_list_insert_chain) {

     // insert mid list

     {

         node nodes[5];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_link(&nodes[3], &nodes[4], loc_prev, loc_next);

         cx_linked_list_insert_chain(&begin, &end, loc_prev, loc_next, &nodes[1], &nodes[3], nullptr);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[2]);

         EXPECT_EQ(nodes[1].next, &nodes[3]);

         EXPECT_EQ(nodes[2].prev, &nodes[4]);

         EXPECT_EQ(nodes[3].prev, &nodes[1]);

         EXPECT_EQ(nodes[4].next, &nodes[2]);

     }

     // insert end

     {

         node nodes[5];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_link(&nodes[3], &nodes[4], loc_prev, loc_next);

         cx_linked_list_insert_chain(&begin, &end, loc_prev, loc_next, &nodes[2], &nodes[3], nullptr);

         EXPECT_EQ(begin, &nodes[0]);

         EXPECT_EQ(end, &nodes[4]);

         EXPECT_EQ(nodes[2].next, &nodes[3]);

         EXPECT_EQ(nodes[3].prev, &nodes[2]);

         EXPECT_EQ(nodes[4].next, nullptr);

     }

     // insert begin

     {

         node nodes[5];

         void *begin = &nodes[0], *end = &nodes[2];

         cx_linked_list_link(&nodes[0], &nodes[1], loc_prev, loc_next);

         cx_linked_list_link(&nodes[1], &nodes[2], loc_prev, loc_next);

         cx_linked_list_link(&nodes[3], &nodes[4], loc_prev, loc_next);

         cx_linked_list_insert_chain(&begin, &end, loc_prev, loc_next, nullptr, &nodes[3], nullptr);

         EXPECT_EQ(begin, &nodes[3]);

         EXPECT_EQ(end, &nodes[2]);

         EXPECT_EQ(nodes[0].prev, &nodes[4]);

         EXPECT_EQ(nodes[3].prev, nullptr);

         EXPECT_EQ(nodes[4].next, &nodes[0]);

     }

 }

 TEST(LinkedList_LowLevel, cx_linked_list_first) {

     auto testdata = create_nodes_test_data(3);

     auto begin = testdata.begin;

     EXPECT_EQ(cx_linked_list_first(begin, loc_prev), begin);

     EXPECT_EQ(cx_linked_list_first(begin->next, loc_prev), begin);

     EXPECT_EQ(cx_linked_list_first(begin->next->next, loc_prev), begin);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_last) {

     auto testdata = create_nodes_test_data(3);

     auto begin = testdata.begin;

     auto end = begin->next->next;

     EXPECT_EQ(cx_linked_list_last(begin, loc_next), end);

     EXPECT_EQ(cx_linked_list_last(begin->next, loc_next), end);

     EXPECT_EQ(cx_linked_list_last(begin->next->next, loc_next), end);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_prev) {

     auto testdata = create_nodes_test_data(3);

     auto begin = testdata.begin;

     EXPECT_EQ(cx_linked_list_prev(begin, loc_next, begin), nullptr);

     EXPECT_EQ(cx_linked_list_prev(begin, loc_next, begin->next), begin);

     EXPECT_EQ(cx_linked_list_prev(begin, loc_next, begin->next->next), begin->next);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_remove) {

     auto testdata = create_nodes_test_data({2, 4, 6});

     auto begin = reinterpret_cast<void *>(testdata.begin);

     auto first = testdata.begin;

     auto second = first->next;

     auto third = second->next;

     auto end = reinterpret_cast<void *>(third);

     cx_linked_list_remove(&begin, &end, loc_prev, loc_next, second);

     EXPECT_EQ(begin, first);

     EXPECT_EQ(end, third);

     EXPECT_EQ(first->prev, nullptr);

     EXPECT_EQ(first->next, third);

     EXPECT_EQ(third->prev, first);

     EXPECT_EQ(third->next, nullptr);

     cx_linked_list_remove(&begin, &end, loc_prev, loc_next, third);

     EXPECT_EQ(begin, first);

     EXPECT_EQ(end, first);

     EXPECT_EQ(first->prev, nullptr);

     EXPECT_EQ(first->next, nullptr);

     cx_linked_list_remove(&begin, &end, loc_prev, loc_next, first);

     EXPECT_EQ(begin, nullptr);

     EXPECT_EQ(end, nullptr);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_size) {

     EXPECT_EQ(cx_linked_list_size(nullptr, loc_next), 0);

     {

         auto testdata = create_nodes_test_data(5);

         EXPECT_EQ(cx_linked_list_size(testdata.begin, loc_next), 5);

     }

     {

         auto testdata = create_nodes_test_data(13);

         EXPECT_EQ(cx_linked_list_size(testdata.begin, loc_next), 13);

     }

 }

 TEST(LinkedList_LowLevel, cx_linked_list_sort) {

     int_test_data<1500> testdata;

     std::array<int, 1500> sorted{};

     std::partial_sort_copy(testdata.data.begin(), testdata.data.end(), sorted.begin(), sorted.end());

     auto scrambled = create_nodes_test_data(testdata.data.begin(), testdata.data.end());

     void *begin = scrambled.begin;

     void *end = cx_linked_list_last(begin, loc_next);

     cx_linked_list_sort(&begin, &end, loc_prev, loc_next, loc_data, cx_cmp_int);

     node *check = reinterpret_cast<node *>(begin);

     node *check_last = nullptr;

     cx_for_n (i, sorted.size()) {

         EXPECT_EQ(check->data, sorted[i]);

         EXPECT_EQ(check->prev, check_last);

         if (i < sorted.size() - 1) {

             ASSERT_NE(check->next, nullptr);

         }

         check_last = check;

         check = check->next;

     }

     EXPECT_EQ(check, nullptr);

     EXPECT_EQ(end, check_last);

 }

 TEST(LinkedList_LowLevel, cx_linked_list_reverse) {

     auto testdata = create_nodes_test_data({2, 4, 6, 8});

     auto expected = create_nodes_test_data({8, 6, 4, 2});

     auto begin = reinterpret_cast<void *>(testdata.begin);

     auto end = cx_linked_list_last(begin, loc_next);

     auto orig_begin = begin, orig_end = end;

     cx_linked_list_reverse(&begin, &end, loc_prev, loc_next);

     EXPECT_EQ(end, orig_begin);

     EXPECT_EQ(begin, orig_end);

     EXPECT_EQ(cx_linked_list_compare(begin, expected.begin, loc_next, loc_data, cx_cmp_int), 0);

 }

 class HighLevelTest : public ::testing::Test {

     mutable std::unordered_set<CxList *> lists;

 protected:

     CxTestingAllocator testingAllocator;

     void TearDown() override {

         for (auto &&l: lists) cxListDestroy(l);

         EXPECT_TRUE(testingAllocator.verify());

     }

     static constexpr size_t testdata_len = 250;

     int_test_data<testdata_len> testdata;

     auto autofree(CxList *list) const -> CxList * {

         if (list != nullptr) lists.insert(list);

         return list;

     }

     auto linkedListFromTestData() const -> CxList * {

         auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int)));

         cxListAddArray(list, testdata.data.data(), testdata_len);

         return list;

     }

     auto pointerLinkedListFromTestData() const -> CxList * {

         auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int *)));

         cxListStorePointers(list);

         // note: cannot use cxListAddArray() because we don't have a list of pointers

         cx_for_n(i, testdata_len) cxListAdd(list, &testdata.data[i]);

         return list;

     }

     auto arrayListFromTestData() const -> CxList * {

         auto list = autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), testdata_len));

         cxListAddArray(list, testdata.data.data(), testdata_len);

         return list;

     }

     void verifyCreate(CxList *list) const {

         EXPECT_EQ(list->content_destructor_type, CX_DESTRUCTOR_NONE);

         EXPECT_EQ(list->size, 0);

         EXPECT_EQ(list->allocator, &testingAllocator);

         EXPECT_EQ(list->cmpfunc, cx_cmp_int);

     }

     void verifyAdd(

             CxList *list,

             bool as_pointer

     ) {

         auto len = testdata_len;

         cx_for_n (i, len) EXPECT_EQ(cxListAdd(list, &testdata.data[i]), 0);

         EXPECT_EQ(list->size, len);

         EXPECT_GE(list->capacity, list->size);

         cx_for_n (i, len) EXPECT_EQ(*(int *) cxListAt(list, i), testdata.data[i]);

         cx_for_n (i, len) ++testdata.data[i];

         if (as_pointer) {

             cx_for_n (i, len) EXPECT_EQ(*(int *) cxListAt(list, i), testdata.data[i]);

         } else {

             cx_for_n (i, len) EXPECT_EQ(*(int *) cxListAt(list, i), testdata.data[i] - 1);

         }

     }

     static void verifyInsert(CxList *list) {

         int a = 5, b = 47, c = 13, d = 42;

         EXPECT_NE(cxListInsert(list, 1, &a), 0);

         EXPECT_EQ(list->size, 0);

         EXPECT_EQ(cxListInsert(list, 0, &a), 0);

         EXPECT_EQ(list->size, 1);

         EXPECT_EQ(cxListInsert(list, 0, &b), 0);

         EXPECT_EQ(list->size, 2);

         EXPECT_EQ(cxListInsert(list, 1, &c), 0);

         EXPECT_EQ(list->size, 3);

         EXPECT_EQ(cxListInsert(list, 3, &d), 0);

         ASSERT_EQ(list->size, 4);

         EXPECT_GE(list->capacity, list->size);

         EXPECT_EQ(*(int *) cxListAt(list, 0), 47);

         EXPECT_EQ(*(int *) cxListAt(list, 1), 13);

         EXPECT_EQ(*(int *) cxListAt(list, 2), 5);

         EXPECT_EQ(*(int *) cxListAt(list, 3), 42);

     }

     static void verifyInsertArray(

             CxList *list,

             bool pointers = false

     ) {

         int a[5] = {5, 47, 11, 13, 42};

         int b[5] = {9, 18, 72, 50, 7};

         int *aptr[5];

         int *bptr[5];

         cx_for_n(i, 5) {

             aptr[i] = &a[i];

             bptr[i] = &b[i];

         }

         size_t inserted;

         if (pointers) {

             inserted = cxListInsertArray(list, 0, aptr, 5);

         } else {

             inserted = cxListInsertArray(list, 0, a, 5);

         }

         EXPECT_EQ(inserted, 5);

         EXPECT_EQ(*(int *) cxListAt(list, 0), 5);

         EXPECT_EQ(*(int *) cxListAt(list, 1), 47);

         EXPECT_EQ(*(int *) cxListAt(list, 2), 11);

         EXPECT_EQ(*(int *) cxListAt(list, 3), 13);

         EXPECT_EQ(*(int *) cxListAt(list, 4), 42);

         if (pointers) {

             inserted = cxListInsertArray(list, 3, bptr, 5);

         } else {

             inserted = cxListInsertArray(list, 3, b, 5);

         }

         EXPECT_EQ(inserted, 5);

         EXPECT_EQ(*(int *) cxListAt(list, 0), 5);

         EXPECT_EQ(*(int *) cxListAt(list, 1), 47);

         EXPECT_EQ(*(int *) cxListAt(list, 2), 11);

         EXPECT_EQ(*(int *) cxListAt(list, 3), 9);

         EXPECT_EQ(*(int *) cxListAt(list, 4), 18);

         EXPECT_EQ(*(int *) cxListAt(list, 5), 72);

         EXPECT_EQ(*(int *) cxListAt(list, 6), 50);

         EXPECT_EQ(*(int *) cxListAt(list, 7), 7);

         EXPECT_EQ(*(int *) cxListAt(list, 8), 13);

         EXPECT_EQ(*(int *) cxListAt(list, 9), 42);

     }

     void verifyRemove(CxList *list) const {

         EXPECT_EQ(cxListRemove(list, 2), 0);

         EXPECT_EQ(cxListRemove(list, 4), 0);

         EXPECT_EQ(list->size, testdata_len - 2);

         EXPECT_GE(list->capacity, list->size);

         EXPECT_EQ(*(int *) cxListAt(list, 0), testdata.data[0]);

         EXPECT_EQ(*(int *) cxListAt(list, 1), testdata.data[1]);

         EXPECT_EQ(*(int *) cxListAt(list, 2), testdata.data[3]);

         EXPECT_EQ(*(int *) cxListAt(list, 3), testdata.data[4]);

         EXPECT_EQ(*(int *) cxListAt(list, 4), testdata.data[6]);

         EXPECT_EQ(cxListRemove(list, 0), 0);

         EXPECT_EQ(list->size, testdata_len - 3);

         EXPECT_GE(list->capacity, list->size);

         EXPECT_EQ(*(int *) cxListAt(list, 0), testdata.data[1]);

         EXPECT_EQ(*(int *) cxListAt(list, 1), testdata.data[3]);

         EXPECT_NE(cxListRemove(list, testdata_len), 0);

     }

     void verifyAt(CxList *list) const {

         auto len = testdata_len;

         EXPECT_EQ(list->size, len);

         cx_for_n (i, len) {

             EXPECT_EQ(*(int *) cxListAt(list, i), testdata.data[i]);

         }

         EXPECT_EQ(cxListAt(list, list->size), nullptr);

     }

     void verifyFind(CxList *list) const {

         cx_for_n (attempt, 25) {

             size_t exp = rand() % testdata_len; // NOLINT(cert-msc50-cpp)

             int val = testdata.data[exp];

             // randomly picked number could occur earlier in list - find first position

             cx_for_n (i, exp) {

                 if (testdata.data[i] == val) {

                     exp = i;

                     break;

                 }

             }

             EXPECT_EQ(cxListFind(list, &val), exp);

         }

     }

     void verifySort(CxList *list) const {

         std::array<int, testdata_len> expected{};

         std::partial_sort_copy(testdata.data.begin(), testdata.data.end(), expected.begin(), expected.end());

         cxListSort(list);

         cx_for_n (i, testdata_len) ASSERT_EQ(*(int *) cxListAt(list, i), expected[i]);

     }

     void verifyIterator(CxList *list) const {

         int i = 0;

         auto iter = cxListBeginMut(list);

         cx_foreach(int*, x, iter) {

             ASSERT_EQ(iter.index, (size_t) (i + 1) / 2);

             ASSERT_EQ(*x, testdata.data[i]);

             if (i % 2 == 1) cxIteratorFlagRemoval(iter);

             i++;

         }

         auto len = testdata_len;

         EXPECT_EQ(i, len);

         ASSERT_EQ(list->size, len / 2);

         cx_for_n(j, len / 2) ASSERT_EQ(*(int *) cxListAt(list, j), testdata.data[j * 2]);

     }

     static void verifyInsertViaIterator(CxList *list) {

         int newdata[] = {10, 20, 30, 40, 50};

         auto iter = cxListMutIterator(list, 2);

         EXPECT_TRUE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 2);

         EXPECT_EQ(*(int *) cxIteratorCurrent(iter), 2);

         cxListInsertAfter(&iter, &newdata[0]);

         EXPECT_TRUE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 2);

         EXPECT_EQ(*(int *) cxIteratorCurrent(iter), 2);

         cxListInsertBefore(&iter, &newdata[1]);

         EXPECT_TRUE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 3);

         EXPECT_EQ(*(int *) cxIteratorCurrent(iter), 2);

         iter = cxListBeginMut(list);

         cxListInsertBefore(&iter, &newdata[2]);

         EXPECT_TRUE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 1);

         EXPECT_EQ(*(int *) cxIteratorCurrent(iter), 0);

         iter = cxListMutIterator(list, list->size);

         cxListInsertBefore(&iter, &newdata[3]);

         EXPECT_FALSE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 9);

         iter = cxListMutIterator(list, list->size);

         cxListInsertAfter(&iter, &newdata[4]);

         EXPECT_FALSE(cxIteratorValid(iter));

         EXPECT_EQ(iter.index, 10);

         int expdata[] = {30, 0, 1, 20, 2, 10, 3, 4, 40, 50};

         cx_for_n (j, 10) EXPECT_EQ(*(int *) cxListAt(list, j), expdata[j]);

     }

     void verifyReverse(CxList *list) const {

         cxListReverse(list);

         cx_for_n(i, testdata_len) {

             ASSERT_EQ(*(int *) cxListAt(list, i), testdata.data[testdata_len - 1 - i]);

         }

     }

     static void verifyCompare(

             CxList *left,

             CxList *right

     ) {

         EXPECT_EQ(cxListCompare(left, right), 0);

         int x = 42;

         cxListAdd(left, &x);

         ASSERT_GT(left->size, right->size);

         EXPECT_GT(cxListCompare(left, right), 0);

         EXPECT_LT(cxListCompare(right, left), 0);

         cxListAdd(right, &x);

         ASSERT_EQ(left->size, right->size);

         EXPECT_EQ(cxListCompare(left, right), 0);

         int a = 5, b = 10;

         cxListInsert(left, 15, &a);

         cxListInsert(right, 15, &b);

         ASSERT_EQ(left->size, right->size);

         EXPECT_LT(cxListCompare(left, right), 0);

         EXPECT_GT(cxListCompare(right, left), 0);

         *(int *) cxListAt(left, 15) = 10;

         EXPECT_EQ(cxListCompare(left, right), 0);

     }

 };

 class LinkedList : public HighLevelTest {

 };

 class PointerLinkedList : public HighLevelTest {

 };

 class ArrayList : public HighLevelTest {

 };

 TEST_F(PointerLinkedList, cxListStorePointers) {

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, 47));

     EXPECT_FALSE(cxListIsStoringPointers(list));

     cxListStorePointers(list);

     EXPECT_EQ(list->itemsize, sizeof(void *));

     EXPECT_NE(list->cl, nullptr);

     EXPECT_NE(list->climpl, nullptr);

     EXPECT_TRUE(cxListIsStoringPointers(list));

     cxListStoreObjects(list);

     EXPECT_NE(list->cl, nullptr);

     EXPECT_EQ(list->climpl, nullptr);

     EXPECT_FALSE(cxListIsStoringPointers(list));

 }

 TEST_F(LinkedList, cxLinkedListCreate) {

     CxList *list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int)));

     ASSERT_NE(list, nullptr);

     EXPECT_EQ(list->itemsize, sizeof(int));

     EXPECT_EQ(list->capacity, (size_t) -1);

     verifyCreate(list);

 }

 TEST_F(ArrayList, cxArrayListCreate) {

     CxList *list = autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), 8));

     ASSERT_NE(list, nullptr);

     EXPECT_EQ(list->itemsize, sizeof(int));

     EXPECT_EQ(list->capacity, 8);

     verifyCreate(list);

 }

 TEST_F(LinkedList, cxListAdd) {

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int)));

     verifyAdd(list, false);

 }

 TEST_F(PointerLinkedList, cxListAdd) {

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int *)));

     cxListStorePointers(list);

     verifyAdd(list, true);

 }

 TEST_F(ArrayList, cxListAdd) {

     auto list = autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), 8));

     verifyAdd(list, false);

 }

 TEST_F(LinkedList, cxListInsert) {

     verifyInsert(autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int))));

 }

 TEST_F(PointerLinkedList, cxListInsert) {

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int *)));

     cxListStorePointers(list);

     verifyInsert(list);

 }

 TEST_F(ArrayList, cxListInsert) {

     verifyInsert(autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), 2)));

 }

 TEST_F(LinkedList, cxListInsertArray) {

     verifyInsertArray(autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int))));

 }

 TEST_F(PointerLinkedList, cxListInsertArray) {

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int *)));

     cxListStorePointers(list);

     verifyInsertArray(list, true);

 }

 TEST_F(ArrayList, cxListInsertArray) {

     verifyInsertArray(autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), 4)));

 }

 TEST_F(LinkedList, cxListRemove) {

     verifyRemove(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, cxListRemove) {

     verifyRemove(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, cxListRemove) {

     verifyRemove(arrayListFromTestData());

 }

 TEST_F(LinkedList, cxListAt) {

     verifyAt(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, cxListAt) {

     verifyAt(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, cxListAt) {

     verifyAt(arrayListFromTestData());

 }

 TEST_F(LinkedList, cxListFind) {

     verifyFind(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, cxListFind) {

     verifyFind(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, cxListFind) {

     verifyFind(arrayListFromTestData());

 }

 TEST_F(LinkedList, cxListSort) {

     verifySort(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, cxListSort) {

     verifySort(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, cxListSort) {

     verifySort(arrayListFromTestData());

 }

 TEST_F(LinkedList, Iterator) {

     verifyIterator(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, Iterator) {

     verifyIterator(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, Iterator) {

     verifyIterator(arrayListFromTestData());

 }

 TEST_F(LinkedList, InsertViaIterator) {

     int fivenums[] = {0, 1, 2, 3, 4, 5};

     CxList *list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int)));

     cxListAddArray(list, fivenums, 5);

     verifyInsertViaIterator(list);

 }

 TEST_F(PointerLinkedList, InsertViaIterator) {

     int fivenums[] = {0, 1, 2, 3, 4, 5};

     auto list = autofree(cxLinkedListCreate(&testingAllocator, cx_cmp_int, sizeof(int *)));

     cxListStorePointers(list);

     // note: cannot use cxListAddArray() because we don't have a list of pointers

     cx_for_n(i, 5) cxListAdd(list, &fivenums[i]);

     verifyInsertViaIterator(list);

 }

 TEST_F(ArrayList, InsertViaIterator) {

     int fivenums[] = {0, 1, 2, 3, 4, 5};

     CxList *list = autofree(cxArrayListCreate(&testingAllocator, cx_cmp_int, sizeof(int), 4));

     cxListAddArray(list, fivenums, 5);

     verifyInsertViaIterator(list);

 }

 TEST_F(LinkedList, cxListReverse) {

     verifyReverse(linkedListFromTestData());

 }

 TEST_F(PointerLinkedList, cxListReverse) {

     verifyReverse(pointerLinkedListFromTestData());

 }

 TEST_F(ArrayList, cxListReverse) {

     verifyReverse(arrayListFromTestData());

 }

 TEST_F(LinkedList, cxListCompare) {

     auto left = linkedListFromTestData();

     auto right = linkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(LinkedList, cxListCompareWithPtrList) {

     auto left = linkedListFromTestData();

     auto right = pointerLinkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(LinkedList, cxListCompareWithArrayList) {

     auto left = linkedListFromTestData();

     auto right = arrayListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(PointerLinkedList, cxListCompare) {

     auto left = pointerLinkedListFromTestData();

     auto right = pointerLinkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(PointerLinkedList, cxListCompareWithNormalList) {

     auto left = pointerLinkedListFromTestData();

     auto right = linkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(PointerLinkedList, cxListCompareWithArrayList) {

     auto left = pointerLinkedListFromTestData();

     auto right = arrayListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(ArrayList, cxListCompare) {

     auto left = arrayListFromTestData();

     auto right = arrayListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(ArrayList, cxListCompareWithPtrList) {

     auto left = arrayListFromTestData();

     auto right = pointerLinkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(ArrayList, cxListCompareWithNormalList) {

     auto left = arrayListFromTestData();

     auto right = linkedListFromTestData();

     verifyCompare(left, right);

 }

 TEST_F(PointerLinkedList, NoDestructor) {

     void *item = cxMalloc(&testingAllocator, sizeof(int));

     auto list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int *));

     cxListStorePointers(list);

     cxListAdd(list, item);

     ASSERT_FALSE(testingAllocator.verify());

     cxListDestroy(list);

     EXPECT_FALSE(testingAllocator.verify());

     cxFree(&testingAllocator, item);

     EXPECT_TRUE(testingAllocator.verify());

 }

 TEST_F(PointerLinkedList, SimpleDestructor) {

     int item = 0;

     auto list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int *));

     cxListStorePointers(list);

     list->content_destructor_type = CX_DESTRUCTOR_SIMPLE;

     list->simple_destructor = [](void *elem) { *(int *) elem = 42; };

     cxListAdd(list, &item);

     cxListDestroy(list);

     EXPECT_EQ(item, 42);

 }

 TEST_F(PointerLinkedList, AdvancedDestructor) {

     void *item = cxMalloc(&testingAllocator, sizeof(int));

     auto list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int *));

     cxListStorePointers(list);

     list->content_destructor_type = CX_DESTRUCTOR_ADVANCED;

     list->advanced_destructor.data = &testingAllocator;

     list->advanced_destructor.func = (cx_destructor_func2) cxFree;

     cxListAdd(list, item);

     ASSERT_FALSE(testingAllocator.verify());

     cxListDestroy(list);

     EXPECT_TRUE(testingAllocator.verify());

 }