tests/test_list.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 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
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "cx/test.h"
#include "util_allocator.h"
#include "cx/compare.h"

#include "cx/array_list.h"
#include "cx/linked_list.h"

#include <stdarg.h>

CX_TEST(test_array_add) {
    CX_ARRAY_DECLARE(int, arr);
    arr = calloc(5, sizeof(int));
    arr[0] = 2;
    arr[1] = 3;
    arr[2] = 5;
    arr[3] = 7;
    arr[4] = 11;
    arr_size = 3;
    arr_capacity = 5;
    int elem = 8, elem2 = 47;
    int result;
    CX_TEST_DO {
        result = cx_array_simple_add(arr, elem);
        CX_TEST_ASSERT(result == 0);
        CX_TEST_ASSERT(arr[0] == 2);
        CX_TEST_ASSERT(arr[1] == 3);
        CX_TEST_ASSERT(arr[2] == 5);
        CX_TEST_ASSERT(arr[3] == 8);
        CX_TEST_ASSERT(arr[4] == 11);
        CX_TEST_ASSERT(arr_size == 4);
        CX_TEST_ASSERT(arr_capacity == 5);

        arr_size = 5;
        result = cx_array_simple_add(arr, elem2);
        CX_TEST_ASSERT(result == 0);
        CX_TEST_ASSERT(arr[0] == 2);
        CX_TEST_ASSERT(arr[1] == 3);
        CX_TEST_ASSERT(arr[2] == 5);
        CX_TEST_ASSERT(arr[3] == 8);
        CX_TEST_ASSERT(arr[4] == 11);
        CX_TEST_ASSERT(arr[5] == 47);
        CX_TEST_ASSERT(arr_size == 6);
        CX_TEST_ASSERT(arr_capacity >= 6);
    }
    free(arr);
}

CX_TEST(test_array_insert_sorted) {
    int d1 = 50;
    int d2 = 80;
    int d3 = 60;
    int d4 = 40;
    int d5 = 70;
    int d6a[6] = {52, 54, 56, 62, 64, 75};
    int d7a[6] = {51, 57, 58, 65, 77, 78};
    int d8 = 90;
    int expected[18] = {
            40, 50, 51, 52, 54, 56, 57, 58, 60,
            62, 64, 65, 70, 75, 77, 78, 80, 90
    };

    CX_ARRAY_DECLARE(int, array);
    cx_array_initialize(array, 4);

    CX_TEST_DO {
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d1, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 1);
        CX_TEST_ASSERT(array_capacity == 4);
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d2, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 2);
        CX_TEST_ASSERT(array_capacity == 4);
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d3, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 3);
        CX_TEST_ASSERT(array_capacity == 4);
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d4, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 4);
        CX_TEST_ASSERT(array_capacity == 4);
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d5, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 5);
        CX_TEST_ASSERT(array_capacity >= 5);
        CX_TEST_ASSERT(0 == cx_array_simple_insert_sorted(array, d6a, 6, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 11);
        CX_TEST_ASSERT(array_capacity >= 11);
        CX_TEST_ASSERT(0 == cx_array_simple_insert_sorted(array, d7a, 6, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 17);
        CX_TEST_ASSERT(array_capacity >= 17);
        CX_TEST_ASSERT(0 == cx_array_simple_add_sorted(array, d8, cx_cmp_int));
        CX_TEST_ASSERT(array_size == 18);
        CX_TEST_ASSERT(array_capacity >= 18);

        CX_TEST_ASSERT(0 == memcmp(array, expected, 18 * sizeof(int)));
    }
    free(array);
}

CX_TEST(test_array_binary_search) {
    int array[18] = {
            40, 50, 51, 52, 54, 56, 57, 58, 60,
            62, 64, 65, 70, 75, 77, 78, 80, 90
    };

    CX_TEST_DO {
        for (size_t i = 0; i < 18; i++) {
            CX_TEST_ASSERT(i == cx_array_binary_search(array, 18, sizeof(int), &array[i], cx_cmp_int));
        }

        int s = 58;
        CX_TEST_ASSERT(7 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(7 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 60;
        CX_TEST_ASSERT(8 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(8 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 59;
        CX_TEST_ASSERT(7 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(8 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 79;
        CX_TEST_ASSERT(15 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(16 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 66;
        CX_TEST_ASSERT(11 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(12 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 69;
        CX_TEST_ASSERT(11 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(12 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 95;
        CX_TEST_ASSERT(17 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
        s = 30;
        CX_TEST_ASSERT(18 == cx_array_binary_search_inf(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(0 == cx_array_binary_search_sup(array, 18, sizeof(int), &s, cx_cmp_int));
        CX_TEST_ASSERT(18 == cx_array_binary_search(array, 18, sizeof(int), &s, cx_cmp_int));
    }
}

typedef struct node {
    struct node *next;
    struct node *prev;
    int data;
} node;

static int test_cmp_node(const void *l, const void *r) {
    const node *left = l;
    const node *right = r;
    return left->data - right->data;
}

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);

static node *create_nodes_test_data(size_t len) {
    node *begin = calloc(1, sizeof(node));
    void *prev = begin;
    for (size_t i = 1; i < len; i++) {
        node *n = calloc(1, sizeof(node));
        cx_linked_list_link(prev, n, loc_prev, loc_next);
        prev = n;
    }
    return begin;
}

void assign_nodes_test_data(node *n, ...) {
    va_list ap;
    va_start(ap, n);
    while (n != NULL) {
        n->data = va_arg(ap, int);
        n = n->next;
    }
    va_end(ap);
}

static void destroy_nodes_test_data(node *n) {
    while (n != NULL) {
        void *next = n->next;
        free(n);
        n = next;
    }
}

static int *int_test_data(size_t len) {
    int *data = malloc(len*sizeof(int));
    for (size_t i = 0 ; i < len ; i++) {
        data[i] = rand(); // NOLINT(*-msc50-cpp)
    }
    return data;
}

CX_TEST(test_linked_list_link_unlink) {
    node a = {0}, b = {0}, c = {0};

    CX_TEST_DO {
        cx_linked_list_link(&a, &b, loc_prev, loc_next);
        CX_TEST_ASSERT(a.prev == NULL);
        CX_TEST_ASSERT(a.next == &b);
        CX_TEST_ASSERT(b.prev == &a);
        CX_TEST_ASSERT(b.next == NULL);

        cx_linked_list_unlink(&a, &b, loc_prev, loc_next);
        CX_TEST_ASSERT(a.prev == NULL);
        CX_TEST_ASSERT(a.next == NULL);
        CX_TEST_ASSERT(b.prev == NULL);
        CX_TEST_ASSERT(b.next == NULL);

        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);
        CX_TEST_ASSERT(a.prev == NULL);
        CX_TEST_ASSERT(a.next == &b);
        CX_TEST_ASSERT(b.prev == &a);
        CX_TEST_ASSERT(b.next == NULL);
        CX_TEST_ASSERT(c.prev == NULL);
        CX_TEST_ASSERT(c.next == NULL);
    }
}

CX_TEST(test_linked_list_at) {
    node a = {0}, b = {0}, c = {0}, d = {0};

    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);

    CX_TEST_DO {
        CX_TEST_ASSERT(cx_linked_list_at(&a, 0, loc_next, 0) == &a);
        CX_TEST_ASSERT(cx_linked_list_at(&a, 0, loc_next, 1) == &b);
        CX_TEST_ASSERT(cx_linked_list_at(&a, 0, loc_next, 2) == &c);
        CX_TEST_ASSERT(cx_linked_list_at(&a, 0, loc_next, 3) == &d);
        CX_TEST_ASSERT(cx_linked_list_at(&a, 0, loc_next, 4) == NULL);
        CX_TEST_ASSERT(cx_linked_list_at(&b, 1, loc_prev, 0) == &a);
        CX_TEST_ASSERT(cx_linked_list_at(&b, 1, loc_next, 1) == &b);
        CX_TEST_ASSERT(cx_linked_list_at(&b, 1, loc_next, 2) == &c);
        CX_TEST_ASSERT(cx_linked_list_at(&b, 1, loc_next, 3) == &d);
        CX_TEST_ASSERT(cx_linked_list_at(&b, 1, loc_next, 4) == NULL);
        CX_TEST_ASSERT(cx_linked_list_at(&d, 3, loc_prev, 0) == &a);
        CX_TEST_ASSERT(cx_linked_list_at(&d, 3, loc_prev, 1) == &b);
    }
}

CX_TEST(test_linked_list_find) {
    void *list = create_nodes_test_data(4);
    assign_nodes_test_data(list, 2, 4, 6, 8);
    CX_TEST_DO {
        int s;
        s = 2;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) == 0);
        s = 4;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) == 1);
        s = 6;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) == 2);
        s = 8;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) == 3);
        s = 10;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) < 0);
        s = -2;
        CX_TEST_ASSERT(cx_linked_list_find(list, loc_next, loc_data, cx_cmp_int, &s) < 0);
    }
    destroy_nodes_test_data(list);
}

CX_TEST(test_linked_list_compare) {
    void *la = create_nodes_test_data(4);
    void *lb = create_nodes_test_data(3);
    void *lc = create_nodes_test_data(4);
    assign_nodes_test_data(la, 2, 4, 6, 8);
    assign_nodes_test_data(lb, 2, 4, 6);
    assign_nodes_test_data(lc, 2, 4, 6, 9);
    CX_TEST_DO {
        CX_TEST_ASSERT(cx_linked_list_compare(la, lb, loc_next, loc_data, cx_cmp_int) > 0);
        CX_TEST_ASSERT(cx_linked_list_compare(lb, la, loc_next, loc_data, cx_cmp_int) < 0);
        CX_TEST_ASSERT(cx_linked_list_compare(lc, la, loc_next, loc_data, cx_cmp_int) > 0);
        CX_TEST_ASSERT(cx_linked_list_compare(la, lc, loc_next, loc_data, cx_cmp_int) < 0);
        CX_TEST_ASSERT(cx_linked_list_compare(la, la, loc_next, loc_data, cx_cmp_int) == 0);
    }
    destroy_nodes_test_data(la);
    destroy_nodes_test_data(lb);
    destroy_nodes_test_data(lc);
}

CX_TEST(test_linked_list_add) {
    node nodes[4];
    void *begin, *end;
    CX_TEST_DO {
        // test with begin, end / prev, next
        memset(nodes, 0, sizeof(node)*4);
        end = begin = NULL;

        cx_linked_list_add(&begin, &end, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == NULL);
        CX_TEST_ASSERT(nodes[0].next == NULL);

        cx_linked_list_add(&begin, &end, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[1]);
        CX_TEST_ASSERT(nodes[0].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == &nodes[0]);

        // test with begin only / prev, next
        memset(nodes, 0, sizeof(node)*4);
        end = begin = NULL;

        cx_linked_list_add(&begin, NULL, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        cx_linked_list_add(&begin, NULL, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == &nodes[0]);

        cx_linked_list_add(&begin, NULL, loc_prev, loc_next, &nodes[2]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[2]);
        CX_TEST_ASSERT(nodes[2].prev == &nodes[1]);

        // test with end only / prev, next
        memset(nodes, 0, sizeof(node)*4);
        end = begin = NULL;

        cx_linked_list_add(NULL, &end, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[0]);
        cx_linked_list_add(NULL, &end, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(end == &nodes[1]);
        CX_TEST_ASSERT(nodes[0].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == &nodes[0]);

        cx_linked_list_add(NULL, &end, loc_prev, loc_next, &nodes[2]);
        CX_TEST_ASSERT(end == &nodes[2]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[2]);
        CX_TEST_ASSERT(nodes[2].prev == &nodes[1]);

        // test with begin, end / next
        memset(nodes, 0, sizeof(node)*4);
        end = begin = NULL;

        cx_linked_list_add(&begin, &end, -1, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[0]);
        cx_linked_list_add(&begin, &end, -1, loc_next, &nodes[1]);
        CX_TEST_ASSERT(end == &nodes[1]);
        CX_TEST_ASSERT(nodes[0].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == NULL);
    }
}

CX_TEST(test_linked_list_prepend) {
    node nodes[4];
    void *begin, *end;
    CX_TEST_DO {
        // test with begin, end / prev, next
        memset(nodes, 0, sizeof(node) * 4);
        end = begin = NULL;

        cx_linked_list_prepend(&begin, &end, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == NULL);
        CX_TEST_ASSERT(nodes[0].next == NULL);

        cx_linked_list_prepend(&begin, &end, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(begin == &nodes[1]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == &nodes[1]);

        // test with begin only / prev, next
        memset(nodes, 0, sizeof(node) * 4);
        end = begin = NULL;

        cx_linked_list_prepend(&begin, NULL, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        cx_linked_list_prepend(&begin, NULL, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(begin == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == &nodes[1]);

        cx_linked_list_prepend(&begin, NULL, loc_prev, loc_next, &nodes[2]);
        CX_TEST_ASSERT(begin == &nodes[2]);
        CX_TEST_ASSERT(nodes[2].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == &nodes[2]);

        // test with end only / prev, next
        memset(nodes, 0, sizeof(node) * 4);
        end = begin = NULL;

        cx_linked_list_prepend(NULL, &end, loc_prev, loc_next, &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[0]);
        cx_linked_list_prepend(NULL, &end, loc_prev, loc_next, &nodes[1]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == &nodes[1]);

        cx_linked_list_prepend(NULL, &end, loc_prev, loc_next, &nodes[2]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[2].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == &nodes[2]);

        // test with begin, end / next
        memset(nodes, 0, sizeof(node) * 4);
        end = begin = NULL;

        cx_linked_list_prepend(&begin, &end, -1, loc_next, &nodes[0]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(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]);
        CX_TEST_ASSERT(begin == &nodes[2]);
        CX_TEST_ASSERT(end == &nodes[0]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[0]);
        CX_TEST_ASSERT(nodes[2].next == &nodes[1]);
        CX_TEST_ASSERT(nodes[1].prev == NULL);
        CX_TEST_ASSERT(nodes[0].prev == NULL);
    }
}

CX_TEST(test_linked_list_insert) {
    node nodes[4];
    void *begin, *end;
    CX_TEST_DO {
        // insert mid list
        memset(nodes, 0, sizeof(node) * 4);
        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]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[2]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[3]);
        CX_TEST_ASSERT(nodes[2].prev == &nodes[3]);
        CX_TEST_ASSERT(nodes[3].prev == &nodes[1]);
        CX_TEST_ASSERT(nodes[3].next == &nodes[2]);

        // insert end
        memset(nodes, 0, sizeof(node) * 4);
        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]);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[3]);
        CX_TEST_ASSERT(nodes[2].next == &nodes[3]);
        CX_TEST_ASSERT(nodes[3].prev == &nodes[2]);
        CX_TEST_ASSERT(nodes[3].next == NULL);

        // insert begin
        memset(nodes, 0, sizeof(node) * 4);
        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, NULL, &nodes[3]);
        CX_TEST_ASSERT(begin == &nodes[3]);
        CX_TEST_ASSERT(end == &nodes[2]);
        CX_TEST_ASSERT(nodes[0].prev == &nodes[3]);
        CX_TEST_ASSERT(nodes[3].prev == NULL);
        CX_TEST_ASSERT(nodes[3].next == &nodes[0]);
    }
}

CX_TEST(test_linked_list_insert_chain) {
    node nodes[5];
    void *begin, *end;
    CX_TEST_DO {
        // insert mid list
        memset(nodes, 0, sizeof(node) * 5);
        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], NULL);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[2]);
        CX_TEST_ASSERT(nodes[1].next == &nodes[3]);
        CX_TEST_ASSERT(nodes[2].prev == &nodes[4]);
        CX_TEST_ASSERT(nodes[3].prev == &nodes[1]);
        CX_TEST_ASSERT(nodes[4].next == &nodes[2]);

        // insert end
        memset(nodes, 0, sizeof(node) * 5);
        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], NULL);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[4]);
        CX_TEST_ASSERT(nodes[2].next == &nodes[3]);
        CX_TEST_ASSERT(nodes[3].prev == &nodes[2]);
        CX_TEST_ASSERT(nodes[4].next == NULL);

        // insert begin
        memset(nodes, 0, sizeof(node) * 5);
        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, NULL, &nodes[3], NULL);
        CX_TEST_ASSERT(begin == &nodes[3]);
        CX_TEST_ASSERT(end == &nodes[2]);
        CX_TEST_ASSERT(nodes[0].prev == &nodes[4]);
        CX_TEST_ASSERT(nodes[3].prev == NULL);
        CX_TEST_ASSERT(nodes[4].next == &nodes[0]);
    }
}

CX_TEST(test_linked_list_insert_sorted) {
    node nodes[5] = {0};
    void *begin, *end;
    nodes[0].data = 3;
    nodes[1].data = 6;
    nodes[2].data = 10;
    nodes[3].data = 11;
    nodes[4].data = 15;
    for (unsigned i = 0 ; i < 4 ; i++) {
        cx_linked_list_link(&nodes[i], &nodes[i+1], loc_prev, loc_next);
    }
    begin = &nodes[0];
    end = &nodes[4];
    CX_TEST_DO {
        // insert a single node
        node new_node = {0};
        new_node.data = 5;
        cx_linked_list_insert_sorted(
                &begin, &end,
                loc_prev, loc_next,
                &new_node, test_cmp_node
        );
        CX_TEST_ASSERT(new_node.prev == &nodes[0]);
        CX_TEST_ASSERT(new_node.next == &nodes[1]);
        CX_TEST_ASSERT(nodes[0].next == &new_node);
        CX_TEST_ASSERT(nodes[1].prev == &new_node);
        CX_TEST_ASSERT(begin == &nodes[0]);
        CX_TEST_ASSERT(end == &nodes[4]);

        // insert a new beginning node
        node new_begin = {0};
        new_begin.data = 1;
        cx_linked_list_insert_sorted(
                &begin, &end,
                loc_prev, loc_next,
                &new_begin, test_cmp_node
        );
        CX_TEST_ASSERT(new_begin.prev == NULL);
        CX_TEST_ASSERT(new_begin.next == &nodes[0]);
        CX_TEST_ASSERT(nodes[0].prev == &new_begin);
        CX_TEST_ASSERT(begin == &new_begin);
        CX_TEST_ASSERT(end == &nodes[4]);

        // now insert a chain
        node chain_start  = {NULL, NULL, 8};
        node chain_mid = {NULL, NULL, 14};
        node chain_end = {NULL, NULL, 17};
        cx_linked_list_link(&chain_start, &chain_mid, loc_prev, loc_next);
        cx_linked_list_link(&chain_mid, &chain_end, loc_prev, loc_next);

        cx_linked_list_insert_sorted_chain(
                &begin, &end,
                loc_prev, loc_next,
                &chain_start, test_cmp_node
        );

        CX_TEST_ASSERT(chain_start.prev == &nodes[1]);
        CX_TEST_ASSERT(chain_start.next == &nodes[2]);
        CX_TEST_ASSERT(chain_mid.prev == &nodes[3]);
        CX_TEST_ASSERT(chain_mid.next == &nodes[4]);
        CX_TEST_ASSERT(chain_end.prev == &nodes[4]);
        CX_TEST_ASSERT(chain_end.next == NULL);
        CX_TEST_ASSERT(begin == &new_begin);
        CX_TEST_ASSERT(end == &chain_end);
    }
}

CX_TEST(test_linked_list_first) {
    node *testdata = create_nodes_test_data(3);
    void *begin = testdata;
    CX_TEST_DO {
        CX_TEST_ASSERT(begin == cx_linked_list_first(testdata, loc_prev));
        CX_TEST_ASSERT(begin == cx_linked_list_first(testdata->next, loc_prev));
        CX_TEST_ASSERT(begin == cx_linked_list_first(testdata->next->next, loc_prev));
    }
    destroy_nodes_test_data(testdata);
}

CX_TEST(test_linked_list_last) {
    node *testdata = create_nodes_test_data(3);
    void *end = testdata->next->next;
    CX_TEST_DO {
        CX_TEST_ASSERT(end == cx_linked_list_last(testdata, loc_next));
        CX_TEST_ASSERT(end == cx_linked_list_last(testdata->next, loc_next));
        CX_TEST_ASSERT(end == cx_linked_list_last(testdata->next->next, loc_next));
    }
    destroy_nodes_test_data(testdata);
}

CX_TEST(test_linked_list_prev) {
    node *testdata = create_nodes_test_data(3);
    CX_TEST_DO {
        CX_TEST_ASSERT(cx_linked_list_prev(testdata, loc_next, testdata) == NULL);
        CX_TEST_ASSERT(cx_linked_list_prev(testdata, loc_next, testdata->next) == testdata);
        CX_TEST_ASSERT(cx_linked_list_prev(testdata, loc_next, testdata->next->next) == testdata->next);
    }
    destroy_nodes_test_data(testdata);
}

CX_TEST(test_linked_list_remove) {
    node *testdata = create_nodes_test_data(3);
    assign_nodes_test_data(testdata, 2, 4, 6);
    node *first = testdata;
    node *second = first->next;
    node *third = second->next;
    void *begin = testdata;
    void *end = third;

    CX_TEST_DO {
        cx_linked_list_remove(&begin, &end, loc_prev, loc_next, second);
        CX_TEST_ASSERT(begin == first);
        CX_TEST_ASSERT(end == third);
        CX_TEST_ASSERT(first->prev == NULL);
        CX_TEST_ASSERT(first->next == third);
        CX_TEST_ASSERT(third->prev == first);
        CX_TEST_ASSERT(third->next == NULL);

        cx_linked_list_remove(&begin, &end, loc_prev, loc_next, third);
        CX_TEST_ASSERT(begin == first);
        CX_TEST_ASSERT(end == first);
        CX_TEST_ASSERT(first->prev == NULL);
        CX_TEST_ASSERT(first->next == NULL);

        cx_linked_list_remove(&begin, &end, loc_prev, loc_next, first);
        CX_TEST_ASSERT(begin == NULL);
        CX_TEST_ASSERT(end == NULL);
    }
    // list is not intact anymore, we have to free nodes individually
    free(first);
    free(second);
    free(third);
}

CX_TEST(test_linked_list_remove_chain) {
    node *testdata = create_nodes_test_data(5);
    assign_nodes_test_data(testdata, 2, 4, 6, 8, 10);
    void *begin = testdata;
    void *end = cx_linked_list_last(testdata, loc_next);
    void *orig_end = end;
    // remember what we need to free
    node *kill_list[5];
    kill_list[0] = testdata;
    for (unsigned i = 1 ; i < 5 ; i++) {
        kill_list[i] = kill_list[i-1]->next;
    }

    CX_TEST_DO {
        // remove chain, but pretend that we don't have a prev pointer!
        size_t result = cx_linked_list_remove_chain(
                &begin, &end, -1, loc_next,
                cx_linked_list_at(begin, 0, loc_next, 2),
                2
        );
        CX_TEST_ASSERT(result == 2);
        CX_TEST_ASSERT(begin == testdata);
        CX_TEST_ASSERT(end == orig_end);
        node *new_idx2 = cx_linked_list_at(begin, 0, loc_next, 2);
        CX_TEST_ASSERT(new_idx2->data == 10);
        CX_TEST_ASSERT(new_idx2->next == NULL);
        // we pretended we don't have prev, so it still points to 8!
        CX_TEST_ASSERT(new_idx2->prev->data == 8);

        // remove last elements and try to remove more than we have
        result = cx_linked_list_remove_chain(
                &begin, &end, -1, loc_next,
                cx_linked_list_at(begin, 0, loc_next, 2),
                2
        );
        CX_TEST_ASSERT(result == 1);
        CX_TEST_ASSERT(begin == testdata);
        CX_TEST_ASSERT(end == testdata->next);
        CX_TEST_ASSERT(NULL == testdata->next->next);
    }

    for (unsigned i = 0 ; i < 5 ; i++) {
        free(kill_list[i]);
    }
}

CX_TEST(test_linked_list_size) {
    node *td5 = create_nodes_test_data(5);
    node *td13 = create_nodes_test_data(13);
    CX_TEST_DO {
        CX_TEST_ASSERT(cx_linked_list_size(NULL, loc_next) == 0);
        CX_TEST_ASSERT(cx_linked_list_size(td5, loc_next) == 5);
        CX_TEST_ASSERT(cx_linked_list_size(td13, loc_next) == 13);
    }
    destroy_nodes_test_data(td5);
    destroy_nodes_test_data(td13);
}

CX_TEST(test_linked_list_sort_empty) {
    void *begin = NULL;
    CX_TEST_DO {
        // cannot assert something, we can just test that it does not crash
        cx_linked_list_sort(&begin, NULL, loc_prev, loc_next, loc_data, cx_cmp_int);
        CX_TEST_ASSERT(true);
    }
}

CX_TEST(test_linked_list_sort) {
    const size_t len = 1500;
    int *testdata = int_test_data(len);
    void *scrambled = create_nodes_test_data(len);
    node *n = scrambled;
    for (size_t i = 0; i < len; i++) {
        n->data = testdata[i];
        n = n->next;
    }
    int *sorted = malloc(len*sizeof(int));
    memcpy(sorted, testdata, len*sizeof(int));
    qsort(sorted, len, sizeof(int), cx_cmp_int);

    void *begin = scrambled;
    void *end = cx_linked_list_last(begin, loc_next);

    CX_TEST_DO {
        cx_linked_list_sort(&begin, &end, loc_prev, loc_next, loc_data, cx_cmp_int);
        node *check = begin;
        node *check_last = NULL;
        for (size_t i = 0; i < len; i++) {
            CX_TEST_ASSERT(check->data == sorted[i]);
            CX_TEST_ASSERT(check->prev == check_last);
            if (i < len - 1) {
                CX_TEST_ASSERT(check->next != NULL);
            }
            check_last = check;
            check = check->next;
        }
        CX_TEST_ASSERT(check == NULL);
        CX_TEST_ASSERT(end == check_last);
    }
    destroy_nodes_test_data(begin);
    free(sorted);
    free(testdata);
}

CX_TEST(test_linked_list_reverse) {
    void *testdata = create_nodes_test_data(4);
    void *expected = create_nodes_test_data(4);
    assign_nodes_test_data(testdata, 2, 4, 6, 8);
    assign_nodes_test_data(expected, 8, 6, 4, 2);
    void *begin = testdata;
    CX_TEST_DO {
        void *end = cx_linked_list_last(begin, loc_next);
        void *orig_begin = begin, *orig_end = end;

        cx_linked_list_reverse(&begin, &end, loc_prev, loc_next);
        CX_TEST_ASSERT(end == orig_begin);
        CX_TEST_ASSERT(begin == orig_end);
        CX_TEST_ASSERT(0 == cx_linked_list_compare(begin, expected, loc_next, loc_data, cx_cmp_int));
    }
    destroy_nodes_test_data(begin);
    destroy_nodes_test_data(expected);
}


CX_TEST(test_empty_list_size) {
    CX_TEST_DO {
        CX_TEST_ASSERT(cxEmptyList->collection.size == 0);
        CX_TEST_ASSERT(cxListSize(cxEmptyList) == 0);
    }
}

CX_TEST(test_empty_list_iterator) {
    CxList *list = cxEmptyList;

    CxIterator it1 = cxListIterator(list);
    CxIterator it2 = cxListBackwardsIterator(list);
    CxIterator it3 = cxListMutIterator(list);
    CxIterator it4 = cxListMutBackwardsIterator(list);

    CX_TEST_DO {
        CX_TEST_ASSERT(!cxIteratorValid(it1));
        CX_TEST_ASSERT(!cxIteratorValid(it2));
        CX_TEST_ASSERT(!cxIteratorValid(it3));
        CX_TEST_ASSERT(!cxIteratorValid(it4));

        int c = 0;
        cx_foreach(void*, data, it1) c++;
        cx_foreach(void*, data, it2) c++;
        cx_foreach(void*, data, it3) c++;
        cx_foreach(void*, data, it4) c++;
        CX_TEST_ASSERT(c == 0);
    }
}

CX_TEST(test_empty_list_noops) {
    CX_TEST_DO {
        CxList copy = *cxEmptyList;
        cxListSort(cxEmptyList);
        cxListClear(cxEmptyList);
        cxListDestroy(cxEmptyList);
        CX_TEST_ASSERT(0 == memcmp(&copy, cxEmptyList, sizeof(CxList))); // NOLINT(*-suspicious-memory-comparison)
    }
}

CX_TEST(test_empty_list_at) {
    CX_TEST_DO {
        CX_TEST_ASSERT(cxListAt(cxEmptyList, 0) == NULL);
        CX_TEST_ASSERT(cxListAt(cxEmptyList, 1) == NULL);
    }
}

CX_TEST(test_empty_list_find) {
    int x = 42, y = 1337;
    CX_TEST_DO {
        CX_TEST_ASSERT(cxListFind(cxEmptyList, &x) < 0);
        CX_TEST_ASSERT(cxListFind(cxEmptyList, &y) < 0);
    }
}

CX_TEST(test_empty_list_compare) {
    CxList *empty = cxEmptyList;
    CxList *ll = cxLinkedListCreateSimple(sizeof(int));
    CxList *al = cxArrayListCreateSimple(sizeof(int), 8);
    int x = 5;
    CX_TEST_DO {
        CX_TEST_ASSERT(0 == cxListCompare(empty, cxEmptyList));
        CX_TEST_ASSERT(0 == cxListCompare(ll, cxEmptyList));
        CX_TEST_ASSERT(0 == cxListCompare(al, cxEmptyList));
        CX_TEST_ASSERT(0 == cxListCompare(cxEmptyList, ll));
        CX_TEST_ASSERT(0 == cxListCompare(cxEmptyList, al));

        cxListAdd(ll, &x);
        cxListAdd(al, &x);

        CX_TEST_ASSERT(0 < cxListCompare(ll, cxEmptyList));
        CX_TEST_ASSERT(0 < cxListCompare(al, cxEmptyList));
        CX_TEST_ASSERT(0 > cxListCompare(cxEmptyList, ll));
        CX_TEST_ASSERT(0 > cxListCompare(cxEmptyList, al));
    }
    cxListDestroy(ll);
    cxListDestroy(al);
}

CX_TEST(test_list_ll_create) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, sizeof(int));
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(int));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == alloc);
        CX_TEST_ASSERT(list->collection.cmpfunc == cx_cmp_int);
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
        cxListDestroy(list);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

CX_TEST(test_list_ll_create_simple) {
    CxList *list = cxLinkedListCreateSimple(sizeof(int));
    CX_TEST_DO {
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(int));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == cxDefaultAllocator);
        CX_TEST_ASSERT(list->collection.cmpfunc == NULL);
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
    }
    cxListDestroy(list);
}

CX_TEST(test_list_ll_store_pointers) {
    CxList *list = cxLinkedListCreateSimple(47);
    CX_TEST_DO {
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
        cxListStorePointers(list);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(void *));
        CX_TEST_ASSERT(list->cl != NULL);
        CX_TEST_ASSERT(list->climpl != NULL);
        CX_TEST_ASSERT(cxListIsStoringPointers(list));
        cxListStoreObjects(list);
        CX_TEST_ASSERT(list->cl != NULL);
        CX_TEST_ASSERT(list->climpl == NULL);
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
    }
    cxListDestroy(list);
}

CX_TEST(test_list_ll_create_simple_for_pointers) {
    CxList *list = cxLinkedListCreateSimple(CX_STORE_POINTERS);
    CX_TEST_DO {
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(void*));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == cxDefaultAllocator);
        CX_TEST_ASSERT(list->collection.cmpfunc == cx_cmp_ptr);
        CX_TEST_ASSERT(cxListIsStoringPointers(list));
    }
    cxListDestroy(list);
}

CX_TEST(test_list_arl_create) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, sizeof(int), 8);
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(int));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == alloc);
        CX_TEST_ASSERT(list->collection.cmpfunc == cx_cmp_int);
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
        cxListDestroy(list);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

CX_TEST(test_list_arl_create_simple) {
    CxList *list = cxArrayListCreateSimple(sizeof(int), 8);
    CX_TEST_DO {
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(int));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == cxDefaultAllocator);
        CX_TEST_ASSERT(list->collection.cmpfunc == NULL);
        CX_TEST_ASSERT(!cxListIsStoringPointers(list));
    }
    cxListDestroy(list);
}

CX_TEST(test_list_arl_create_simple_for_pointers) {
    CxList *list = cxArrayListCreateSimple(CX_STORE_POINTERS, 8);
    CX_TEST_DO {
        CX_TEST_ASSERT(list != NULL);
        CX_TEST_ASSERT(list->collection.elem_size == sizeof(void*));
        CX_TEST_ASSERT(list->collection.simple_destructor == NULL);
        CX_TEST_ASSERT(list->collection.advanced_destructor == NULL);
        CX_TEST_ASSERT(list->collection.destructor_data == NULL);
        CX_TEST_ASSERT(cxListSize(list) == 0);
        CX_TEST_ASSERT(list->collection.allocator == cxDefaultAllocator);
        CX_TEST_ASSERT(list->collection.cmpfunc == cx_cmp_ptr);
        CX_TEST_ASSERT(cxListIsStoringPointers(list));
    }
    cxListDestroy(list);
}

static void test_fake_simple_int_destr(void *elem) {
    *(int *) elem = 42;
}

CX_TEST(test_list_pll_destroy_no_destr) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        void *item = cxMalloc(alloc, sizeof(int));
        CxList *list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS);
        cxListAdd(list, item);
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxListDestroy(list);
        // item is not yet freed
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxFree(alloc, item);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

CX_TEST(test_list_pll_destroy_simple_destr) {
    CX_TEST_DO {
        int item = 0;
        CxList *list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS);
        list->collection.simple_destructor = test_fake_simple_int_destr;
        cxListAdd(list, &item);
        cxListDestroy(list);
        CX_TEST_ASSERT(item == 42);
    }
}

CX_TEST(test_list_pll_destroy_adv_destr) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        void *item = cxMalloc(alloc, sizeof(int));
        CxList *list = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS);
        list->collection.destructor_data = alloc;
        list->collection.advanced_destructor = (cx_destructor_func2) cxFree;
        cxListAdd(list, item);
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxListDestroy(list);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

CX_TEST(test_list_parl_destroy_no_destr) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        void *item = cxMalloc(alloc, sizeof(int));
        CxList *list = cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS, 4);
        cxListAdd(list, item);
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxListDestroy(list);
        // item is not yet freed
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxFree(alloc, item);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

CX_TEST(test_list_parl_destroy_simple_destr) {
    CX_TEST_DO {
        int item = 0;
        CxList *list = cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS, 4);
        list->collection.simple_destructor = test_fake_simple_int_destr;
        cxListAdd(list, &item);
        cxListDestroy(list);
        CX_TEST_ASSERT(item == 42);
    }
}

CX_TEST(test_list_parl_destroy_adv_destr) {
    CxTestingAllocator talloc;
    cx_testing_allocator_init(&talloc);
    CxAllocator *alloc = &talloc.base;
    CX_TEST_DO {
        void *item = cxMalloc(alloc, sizeof(int));
        CxList *list = cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS, 4);
        list->collection.destructor_data = alloc;
        list->collection.advanced_destructor = (cx_destructor_func2) cxFree;
        cxListAdd(list, item);
        CX_TEST_ASSERT(!cx_testing_allocator_verify(&talloc));
        cxListDestroy(list);
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
    }
    cx_testing_allocator_destroy(&talloc);
}

#define set_up_combo \
    CxTestingAllocator talloc; \
    cx_testing_allocator_init(&talloc); \
    CxAllocator *alloc = &talloc.base; \
    CX_TEST_DO {
#define tear_down_combo \
        cxListDestroy(list); \
        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));\
    } \
    cx_testing_allocator_destroy(&talloc);
#define roll_out_test_invokers(name) \
CX_TEST(test_list_ll_##name) { \
    set_up_combo \
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, sizeof(int)); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, false); \
    tear_down_combo \
} \
CX_TEST(test_list_arl_##name) { \
    set_up_combo \
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, sizeof(int), 8); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, false); \
    tear_down_combo \
} \
CX_TEST(test_list_pll_##name) { \
    set_up_combo \
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, CX_STORE_POINTERS); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, true); \
    tear_down_combo \
} \
CX_TEST(test_list_parl_##name) { \
    set_up_combo \
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, CX_STORE_POINTERS, 8); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, true); \
    tear_down_combo \
}
#define roll_out_test_combos(name, body) \
static CX_TEST_SUBROUTINE(test_list_verify_##name, CxList *list, \
    cx_attr_unused bool isptrlist) body \
roll_out_test_invokers(name)

static void set_default_class_funcs(CxList *list, cx_list_class *defaulted_cl) {
    const cx_list_class *cl = list->climpl == NULL ? list->cl : list->climpl;
    memcpy(defaulted_cl, cl, sizeof(cx_list_class));
    defaulted_cl->insert_array = cx_list_default_insert_array;
    defaulted_cl->insert_sorted = cx_list_default_insert_sorted;
    defaulted_cl->sort = cx_list_default_sort;
    defaulted_cl->swap = cx_list_default_swap;
    defaulted_cl->compare = NULL;
    if (list->climpl == NULL) {
        list->cl = defaulted_cl;
    } else {
        list->climpl = defaulted_cl;
    }
}

#define do_set_default_class_funcs(list) \
    cx_list_class defaulted_cl; \
    set_default_class_funcs(list, &defaulted_cl)
#define roll_out_test_combos_with_defaulted_funcs(name, body) \
static CX_TEST_SUBROUTINE(test_list_verify_##name, CxList *list, \
    cx_attr_unused bool isptrlist) body \
roll_out_test_invokers(name) \
CX_TEST(test_list_llm_##name) { \
    set_up_combo \
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, sizeof(int)); \
        do_set_default_class_funcs(list); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, false); \
    tear_down_combo \
} \
CX_TEST(test_list_arlm_##name) { \
    set_up_combo \
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, sizeof(int), 8); \
        do_set_default_class_funcs(list); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, false); \
    tear_down_combo \
} \
CX_TEST(test_list_pllm_##name) { \
    set_up_combo \
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, CX_STORE_POINTERS); \
        do_set_default_class_funcs(list); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, true); \
    tear_down_combo \
} \
CX_TEST(test_list_parlm_##name) { \
    set_up_combo \
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, CX_STORE_POINTERS, 8); \
        do_set_default_class_funcs(list); \
        CX_TEST_CALL_SUBROUTINE(test_list_verify_##name, list, true); \
    tear_down_combo \
}

#define array_init(...) {__VA_ARGS__}

static inline int *int_test_data_added_to_list(CxList *list, bool isptrlist, size_t len) {
    int *testdata = int_test_data(len);
    if (isptrlist) {
        for (size_t i = 0; i < len; i++) {
            cxListAdd(list, &testdata[i]);
        }
    } else {
        cxListAddArray(list, testdata, len);
    }
    return testdata;
}

roll_out_test_combos(add, {
    const size_t len = 250;
    int *testdata = int_test_data(len);
    for (size_t i = 0; i < len; i++) {
        CX_TEST_ASSERT(cxListAdd(list, &testdata[i]) == 0);
    }
    CX_TEST_ASSERT(cxListSize(list) == len);
    for (size_t i = 0; i < len; i++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, i) == testdata[i]);
    }
    for (size_t i = 0; i < len; i++) {
        ++testdata[i];
    }
    if (isptrlist) {
        for (size_t i = 0; i < len; i++) {
            CX_TEST_ASSERT(*(int *) cxListAt(list, i) == testdata[i]);
        }
    } else {
        for (size_t i = 0; i < len; i++) {
            CX_TEST_ASSERT(*(int *) cxListAt(list, i) == testdata[i] - 1);
        }
    }
    free(testdata);
})

roll_out_test_combos(insert, {
    int a = 5;
    int b = 47;
    int c = 13;
    int d = 42;
    CX_TEST_ASSERT(cxListInsert(list, 1, &a) != 0);
    CX_TEST_ASSERT(cxListSize(list) == 0);
    CX_TEST_ASSERT(cxListInsert(list, 0, &a) == 0);
    CX_TEST_ASSERT(cxListSize(list) == 1);
    CX_TEST_ASSERT(cxListInsert(list, 0, &b) == 0);
    CX_TEST_ASSERT(cxListSize(list) == 2);
    CX_TEST_ASSERT(cxListInsert(list, 1, &c) == 0);
    CX_TEST_ASSERT(cxListSize(list) == 3);
    CX_TEST_ASSERT(cxListInsert(list, 3, &d) == 0);
    CX_TEST_ASSERT(cxListSize(list) == 4);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 0) == 47);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 1) == 13);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 2) == 5);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 3) == 42);
})

roll_out_test_combos_with_defaulted_funcs(insert_array, {
    int a[5] = array_init(5, 47, 11, 13, 42);
    int b[5] = array_init(9, 18, 72, 50, 7);
    int *aptr[5];
    int *bptr[5];
    for (size_t i = 0; i < 5; i++) {
        aptr[i] = &a[i];
        bptr[i] = &b[i];
    }

    size_t inserted;

    if (isptrlist) {
        inserted = cxListInsertArray(list, 0, aptr, 5);
    } else {
        inserted = cxListInsertArray(list, 0, a, 5);
    }
    CX_TEST_ASSERT(inserted == 5);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 0) == 5);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 1) == 47);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 2) == 11);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 3) == 13);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 4) == 42);
    if (isptrlist) {
        inserted = cxListInsertArray(list, 3, bptr, 5);
    } else {
        inserted = cxListInsertArray(list, 3, b, 5);
    }
    CX_TEST_ASSERT(inserted == 5);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 0) == 5);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 1) == 47);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 2) == 11);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 3) == 9);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 4) == 18);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 5) == 72);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 6) == 50);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 7) == 7);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 8) == 13);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 9) == 42);
})

roll_out_test_combos_with_defaulted_funcs(insert_sorted, {
    int d1 = 50;
    int d2 = 80;
    int d3 = 60;
    int d4 = 40;
    int d5 = 70;
    int d6a[6] = array_init(52, 54, 56, 62, 64, 75);
    int d7a[6] = array_init(51, 57, 58, 65, 77, 78);
    int d8 = 90;
    int *d6ptr[6];
    int *d7ptr[6];
    for (size_t i = 0; i < 6; i++) {
        d6ptr[i] = &d6a[i];
        d7ptr[i] = &d7a[i];
    }
    size_t inserted;
    int expected[18] = array_init(
            40, 50, 51, 52, 54, 56, 57, 58, 60,
            62, 64, 65, 70, 75, 77, 78, 80, 90
    );

    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d1));
    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d2));
    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d3));
    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d4));
    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d5));
    if (isptrlist) {
        inserted = cxListInsertSortedArray(list, d6ptr, 6);
    } else {
        inserted = cxListInsertSortedArray(list, d6a, 6);
    }
    CX_TEST_ASSERT(inserted == 6);
    if (isptrlist) {
        inserted = cxListInsertSortedArray(list, d7ptr, 6);
    } else {
        inserted = cxListInsertSortedArray(list, d7a, 6);
    }
    CX_TEST_ASSERT(inserted == 6);
    CX_TEST_ASSERT(0 == cxListInsertSorted(list, &d8));

    CX_TEST_ASSERT(cxListSize(list) == 18);
    for (size_t i = 0; i < 18; i++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, i) == expected[i]);
    }
})

roll_out_test_combos(remove, {
    const size_t testdata_len = 32;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);

    CX_TEST_ASSERT(cxListRemove(list, 2) == 0);
    CX_TEST_ASSERT(cxListRemove(list, 4) == 0);
    CX_TEST_ASSERT(cxListSize(list) == testdata_len - 2);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 0) == testdata[0]);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 1) == testdata[1]);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 2) == testdata[3]);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 3) == testdata[4]);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 4) == testdata[6]);
    CX_TEST_ASSERT(cxListRemove(list, 0) == 0);
    CX_TEST_ASSERT(cxListSize(list) == testdata_len - 3);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 0) == testdata[1]);
    CX_TEST_ASSERT(*(int *) cxListAt(list, 1) == testdata[3]);
    CX_TEST_ASSERT(cxListRemove(list, testdata_len) != 0);
    free(testdata);
})

static unsigned test_remove_array_destr_ctr;
static void test_remove_array_destr(cx_attr_unused void *d) {
    test_remove_array_destr_ctr++;
}

roll_out_test_combos(remove_array, {
    const size_t testdata_len = 32;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);
    cxDefineDestructor(list, test_remove_array_destr);
    test_remove_array_destr_ctr = 0;

    // first, remove and get - no destructor must be called
    int targete[8];
    int *targetp[8];
    memset(targete, 0, sizeof(targete));
    memset(targetp, 0, sizeof(targetp));
    void *target = isptrlist ? (void*) targetp : targete;
    CX_TEST_ASSERT(8 == cxListRemoveArrayAndGet(list, 8, 8, target));
    CX_TEST_ASSERT(0 == test_remove_array_destr_ctr);
    CX_TEST_ASSERT(24 == cxListSize(list));
    for (unsigned int i = 0 ; i < 8 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[i]);
    }
    for (unsigned int i = 8 ; i < 24 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[8+i]);
    }
    for (unsigned int i = 0 ; i < 8 ; i++) {
        if (isptrlist) {
            CX_TEST_ASSERT(targetp[i] == &testdata[8 + i]);
        } else {
            CX_TEST_ASSERT(targete[i] == testdata[8 + i]);
        }
    }

    // now, just remove - destructor must be called
    CX_TEST_ASSERT(8 == cxListRemoveArray(list, 8, 8));
    CX_TEST_ASSERT(8 == test_remove_array_destr_ctr);
    CX_TEST_ASSERT(16 == cxListSize(list));
    for (unsigned int i = 0 ; i < 8 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[i]);
    }
    for (unsigned int i = 8 ; i < 16 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[16+i]);
    }

    // finally, remove and get out of bounds
    test_remove_array_destr_ctr = 0;
    memset(targete, 0, sizeof(targete));
    memset(targetp, 0, sizeof(targetp));
    CX_TEST_ASSERT(4 == cxListRemoveArrayAndGet(list, 12, 8, target));
    CX_TEST_ASSERT(0 == test_remove_array_destr_ctr);
    CX_TEST_ASSERT(12 == cxListSize(list));
    for (unsigned int i = 0 ; i < 8 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[i]);
    }
    for (unsigned int i = 8 ; i < 12 ; i++) {
        CX_TEST_ASSERT((*(int*)cxListAt(list, i)) == testdata[16+i]);
    }
    for (unsigned int i = 0 ; i < 4 ; i++) {
        if (isptrlist) {
            CX_TEST_ASSERT(targetp[i] == &testdata[28 + i]);
        } else {
            CX_TEST_ASSERT(targete[i] == testdata[28 + i]);
        }
    }
    for (unsigned int i = 4 ; i < 8 ; i++) {
        if (isptrlist) {
            CX_TEST_ASSERT(targetp[i] == 0);
        } else {
            CX_TEST_ASSERT(targete[i] == 0);
        }
    }

    free(testdata);
})

roll_out_test_combos(find_remove, {
    const size_t testdata_len = 250;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);

    int exp = rand() % testdata_len; // NOLINT(cert-msc50-cpp)
    int val = testdata[exp];
    // randomly picked number could occur earlier in list - find first position
    for (int i = 0 ; i < exp ; i++) {
        if (testdata[i] == val) {
            exp = i;
            break;
        }
    }
    CX_TEST_ASSERT(cxListSize(list) == testdata_len);
    CX_TEST_ASSERT(cxListFind(list, &val) == exp);
    CX_TEST_ASSERT(cxListFindRemove(list, &val) == exp);
    CX_TEST_ASSERT(cxListSize(list) == testdata_len - 1);
    CX_TEST_ASSERT(cxListFind(list, &val) != exp);

    int notinlist = -1;
    CX_TEST_ASSERT(cxListFindRemove(list, &notinlist) < 0);
    CX_TEST_ASSERT(cxListSize(list) == testdata_len - 1);

    free(testdata);
})

roll_out_test_combos(clear, {
    int *testdata = int_test_data_added_to_list(list, isptrlist, 8);
    CX_TEST_ASSERT(cxListSize(list) > 0);
    cxListClear(list);
    CX_TEST_ASSERT(cxListSize(list) == 0);
    free(testdata);
})

roll_out_test_combos(at, {
    size_t len = 128;
    int *testdata = int_test_data_added_to_list(list, isptrlist, 128);
    CX_TEST_ASSERT(cxListSize(list) == len);
    for (size_t i = 0; i < len; i++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, i) == testdata[i]);
    }
    CX_TEST_ASSERT(cxListAt(list, cxListSize(list)) == NULL);
    free(testdata);
})

roll_out_test_combos_with_defaulted_funcs(swap, {
    int original[16] = array_init(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
    int swapped[16] = array_init(8, 4, 14, 3, 1, 5, 9, 12, 0, 6, 11, 10, 7, 15, 2, 13);

    for (size_t i = 0; i < 16; i++) {
        cxListAdd(list, &original[i]);
    }

    CX_TEST_ASSERT(0 == cxListSwap(list, 1, 4));
    CX_TEST_ASSERT(0 == cxListSwap(list, 2, 14));
    CX_TEST_ASSERT(0 == cxListSwap(list, 9, 6));
    CX_TEST_ASSERT(0 == cxListSwap(list, 3, 3));
    CX_TEST_ASSERT(0 == cxListSwap(list, 10, 11));
    CX_TEST_ASSERT(0 == cxListSwap(list, 8, 0));
    CX_TEST_ASSERT(0 == cxListSwap(list, 7, 12));
    CX_TEST_ASSERT(0 == cxListSwap(list, 13, 15));

    CX_TEST_ASSERT(0 != cxListSwap(list, 5, 16));
    CX_TEST_ASSERT(0 != cxListSwap(list, 16, 6));
    CX_TEST_ASSERT(0 != cxListSwap(list, 16, 17));

    CxIterator iter = cxListIterator(list);
    cx_foreach(int*, e, iter) {
        CX_TEST_ASSERT(*e == swapped[iter.index]);
    }
    iter = cxListBackwardsIterator(list);
    cx_foreach(int*, e, iter) {
        CX_TEST_ASSERT(*e == swapped[iter.index]);
    }
})

CX_TEST(test_list_ll_swap_no_sbo) {
    set_up_combo
        CxList *list = cxLinkedListCreate(alloc, cx_cmp_int, 2*cx_linked_list_swap_sbo_size);
        CX_TEST_CALL_SUBROUTINE(test_list_verify_swap, list, false);
    tear_down_combo
}
CX_TEST(test_list_arl_swap_no_sbo) {
    set_up_combo
        CxList *list = cxArrayListCreate(alloc, cx_cmp_int, 2*cx_array_swap_sbo_size, 8);
        CX_TEST_CALL_SUBROUTINE(test_list_verify_swap, list, false);
    tear_down_combo
}

roll_out_test_combos(find, {
    const size_t testdata_len = 500;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);

    for (size_t attempt = 0; attempt < 25; attempt++) {
        int exp = rand() % testdata_len; // NOLINT(cert-msc50-cpp)
        int val = testdata[exp];
        // randomly picked number could occur earlier in list - find first position
        for (int i = 0 ; i < exp ; i++) {
            if (testdata[i] == val) {
                exp = i;
                break;
            }
        }
        CX_TEST_ASSERT(cxListFind(list, &val) == exp);
    }

    int notinlist = -1;
    CX_TEST_ASSERT(cxListFind(list, &notinlist) < 0);

    free(testdata);
})

roll_out_test_combos_with_defaulted_funcs(sort, {
    const size_t testdata_len = 250;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);
    int *expected = malloc(testdata_len*sizeof(int));
    memcpy(expected, testdata, testdata_len*sizeof(int));
    qsort(expected, testdata_len, sizeof(int), cx_cmp_int);

    cxListSort(list);
    for (size_t i = 0; i < testdata_len; i++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, i) == expected[i]);
    }

    free(expected);
    free(testdata);
})

roll_out_test_combos(reverse, {
    const size_t testdata_len = 50;
    int *testdata = int_test_data_added_to_list(list, isptrlist, testdata_len);
    cxListReverse(list);
    for (size_t i = 0; i < testdata_len; i++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, i) == testdata[testdata_len - 1 - i]);
    }
    free(testdata);
})

roll_out_test_combos(iterator, {
    const size_t len = 50;
    int *testdata = int_test_data_added_to_list(list, isptrlist, len);

    CxIterator iter = cxListIterator(list);
    CX_TEST_ASSERT(iter.elem_size == list->collection.elem_size);
    CX_TEST_ASSERT(iter.elem_count == list->collection.size);
    size_t i = 0;
    cx_foreach(int*, x, iter) {
        CX_TEST_ASSERT(i == iter.index);
        CX_TEST_ASSERT(*x == testdata[iter.index]);
        i++;
    }
    CX_TEST_ASSERT(i == cxListSize(list));
    iter = cxListBackwardsIterator(list);
    cx_foreach(int*, x, iter) {
        CX_TEST_ASSERT(i - 1 == iter.index);
        CX_TEST_ASSERT(*x == testdata[iter.index]);
        i--;
    }
    CX_TEST_ASSERT(i == 0);
    i = len / 2;
    CxIterator mut_iter = cxListMutIteratorAt(list, i);
    CX_TEST_ASSERT(mut_iter.elem_size == list->collection.elem_size);
    CX_TEST_ASSERT(mut_iter.elem_count == list->collection.size);
    size_t j = 0;
    cx_foreach(int*, x, mut_iter) {
        CX_TEST_ASSERT(mut_iter.index == len / 2 + j / 2);
        CX_TEST_ASSERT(*x == testdata[i]);
        if (i % 2 == 1) cxIteratorFlagRemoval(mut_iter);
        i++;
        j++;
    }
    CX_TEST_ASSERT(i == len);
    i = len / 2;
    j = 0;
    mut_iter = cxListMutBackwardsIteratorAt(list, i - 1);
    cx_foreach(int*, x, mut_iter) {
        CX_TEST_ASSERT(mut_iter.index == len / 2 - 1 - j);
        CX_TEST_ASSERT(*x == testdata[i - 1]);
        if (i % 2 == 0) cxIteratorFlagRemoval(mut_iter);
        i--;
        j++;
    }
    CX_TEST_ASSERT(i == 0);
    CX_TEST_ASSERT(cxListSize(list) == len / 2);
    for (size_t k = 0; k < len / 2; k++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, k) == testdata[k * 2]);
    }

    free(testdata);
})

roll_out_test_combos(insert_with_iterator, {
    int fivenums[] = array_init(0, 1, 2, 3, 4);
    for (size_t i = 0; i < 5; i++) {
        cxListAdd(list, &fivenums[i]);
    }
    int newdata[] = array_init(10, 20, 30, 40, 50);

    CxIterator iter = cxListMutIteratorAt(list, 2);
    CX_TEST_ASSERT(cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 2);
    CX_TEST_ASSERT(*(int *) cxIteratorCurrent(iter) == 2);
    CX_TEST_ASSERT(iter.elem_count == 5);
    cxListInsertAfter(&iter, &newdata[0]);
    CX_TEST_ASSERT(cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 2);
    CX_TEST_ASSERT(*(int *) cxIteratorCurrent(iter) == 2);
    CX_TEST_ASSERT(iter.elem_count == 6);
    cxListInsertBefore(&iter, &newdata[1]);
    CX_TEST_ASSERT(cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 3);
    CX_TEST_ASSERT(*(int *) cxIteratorCurrent(iter) == 2);
    CX_TEST_ASSERT(iter.elem_count == 7);

    iter = cxListMutIterator(list);
    cxListInsertBefore(&iter, &newdata[2]);
    CX_TEST_ASSERT(cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 1);
    CX_TEST_ASSERT(*(int *) cxIteratorCurrent(iter) == 0);
    CX_TEST_ASSERT(iter.elem_count == 8);
    iter = cxListMutIteratorAt(list, cxListSize(list));
    cxListInsertBefore(&iter, &newdata[3]);
    CX_TEST_ASSERT(!cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 9);
    CX_TEST_ASSERT(iter.elem_count == 9);
    iter = cxListMutIteratorAt(list, cxListSize(list));
    cxListInsertAfter(&iter, &newdata[4]);
    CX_TEST_ASSERT(!cxIteratorValid(iter));
    CX_TEST_ASSERT(iter.index == 10);
    CX_TEST_ASSERT(iter.elem_count == 10);

    int expdata[] = array_init(30, 0, 1, 20, 2, 10, 3, 4, 40, 50);
    for (size_t j = 0; j < 10; j++) {
        CX_TEST_ASSERT(*(int *) cxListAt(list, j) == expdata[j]);
    }
})

static CX_TEST_SUBROUTINE(test_list_verify_compare, CxList *left, CxList *right) {
    CX_TEST_ASSERTM(cxListCompare(left, right) == 0, "lists don't start identical");
    int x = 42;
    cxListAdd(left, &x);
    CX_TEST_ASSERT(cxListSize(left) > cxListSize(right));
    CX_TEST_ASSERT(cxListCompare(left, right) > 0);
    CX_TEST_ASSERT(cxListCompare(right, left) < 0);
    cxListAdd(right, &x);
    CX_TEST_ASSERT(cxListSize(left) == cxListSize(right));
    CX_TEST_ASSERT(cxListCompare(left, right) == 0);
    int a = 5, b = 10;
    cxListInsert(left, 15, &a);
    cxListInsert(right, 15, &b);
    CX_TEST_ASSERT(cxListSize(left) == cxListSize(right));
    CX_TEST_ASSERT(cxListCompare(left, right) < 0);
    CX_TEST_ASSERT(cxListCompare(right, left) > 0);
    *(int *) cxListAt(left, 15) = 10;
    CX_TEST_ASSERT(cxListCompare(left, right) == 0);
}

#define roll_out_compare_tests(suffix, otherctr) \
roll_out_test_combos(compare_##suffix, { \
    const size_t len = 47; \
    int *testdata = int_test_data_added_to_list(list, isptrlist, len); \
    CxList *other = otherctr; \
    for (size_t i = 0; i < len; i++) cxListAdd(other, &testdata[i]); \
    CX_TEST_CALL_SUBROUTINE(test_list_verify_compare, list, other); \
    cxListDestroy(other); \
    free(testdata); \
})

roll_out_compare_tests(
        ll, cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int))
)

roll_out_compare_tests(
        pll, cxLinkedListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS)
)

roll_out_compare_tests(
        arl, cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int), 50)
)

roll_out_compare_tests(
        parl, cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, CX_STORE_POINTERS, 50)
)

roll_out_test_combos_with_defaulted_funcs(compare_unoptimized, {
    const size_t len = 33;
    int *testdata = int_test_data_added_to_list(list, isptrlist, len);
    CxList *other = cxArrayListCreate(cxDefaultAllocator, cx_cmp_int, sizeof(int), 50);
    do_set_default_class_funcs(other);
    for (size_t i = 0; i < len; i++) cxListAdd(other, &testdata[i]);
    CX_TEST_CALL_SUBROUTINE(test_list_verify_compare, list, other);
    cxListDestroy(other);
    free(testdata);
})

static unsigned destr_test_ctr;
static int destr_last_value;

static void simple_destr_test_fun(void *data) {
    int *ptr = data;
    destr_last_value = *ptr;
    *ptr = destr_last_value + 1;
    destr_test_ctr++;
}

static void advanced_destr_test_fun(cx_attr_unused void *u, void *data) {
    simple_destr_test_fun(data);
}

static CX_TEST_SUBROUTINE(test_list_verify_destructor, CxList *list,
                          const int *testdata, size_t testdata_len) {
    destr_test_ctr = 0;
    
    int off = cxListIsStoringPointers(list) ? 1 : 0;

    cxListRemove(list, 15);
    CX_TEST_ASSERT(1 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[15] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));
    cxListRemove(list, 47);
    CX_TEST_ASSERT(2 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[48] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));

    CxIterator iter = cxListMutIteratorAt(list, 7);
    cxIteratorNext(iter);
    CX_TEST_ASSERT(2 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[48] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));
    cxIteratorFlagRemoval(iter);
    cxIteratorNext(iter);
    CX_TEST_ASSERT(3 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[8] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));

    iter = cxListMutBackwardsIteratorAt(list, 5);
    cxIteratorNext(iter);
    CX_TEST_ASSERT(3 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[8] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));
    cxIteratorFlagRemoval(iter);
    cxIteratorNext(iter);
    CX_TEST_ASSERT(4 == destr_test_ctr);
    CX_TEST_ASSERT(testdata[4] == destr_last_value + off);
    CX_TEST_ASSERT(testdata_len - destr_test_ctr == cxListSize(list));

    cxListClear(list);
    CX_TEST_ASSERT(testdata_len == destr_test_ctr);
    CX_TEST_ASSERT(testdata[testdata_len - 1] == destr_last_value + off);
}

roll_out_test_combos(simple_destr, {
    const size_t len = 60;
    int *testdata = int_test_data_added_to_list(list, isptrlist, len);
    cxDefineDestructor(list, simple_destr_test_fun);
    CX_TEST_CALL_SUBROUTINE(test_list_verify_destructor, list, testdata, len);
    free(testdata);
})

roll_out_test_combos(advanced_destr, {
    const size_t len = 75;
    int *testdata = int_test_data_added_to_list(list, isptrlist, len);
    cxDefineAdvancedDestructor(list, advanced_destr_test_fun, NULL);
    CX_TEST_CALL_SUBROUTINE(test_list_verify_destructor, list, testdata, len);
    free(testdata);
})

CxTestSuite *cx_test_suite_array_list(void) {
    CxTestSuite *suite = cx_test_suite_new("array_list");

    cx_test_register(suite, test_array_add);
    cx_test_register(suite, test_array_insert_sorted);
    cx_test_register(suite, test_array_binary_search);

    cx_test_register(suite, test_list_arl_create);
    cx_test_register(suite, test_list_arl_create_simple);
    cx_test_register(suite, test_list_arl_create_simple_for_pointers);
    cx_test_register(suite, test_list_parl_destroy_no_destr);
    cx_test_register(suite, test_list_parl_destroy_simple_destr);
    cx_test_register(suite, test_list_parl_destroy_adv_destr);

    cx_test_register(suite, test_list_arl_add);
    cx_test_register(suite, test_list_parl_add);
    cx_test_register(suite, test_list_arl_insert);
    cx_test_register(suite, test_list_parl_insert);
    cx_test_register(suite, test_list_arl_insert_array);
    cx_test_register(suite, test_list_parl_insert_array);
    cx_test_register(suite, test_list_arl_insert_sorted);
    cx_test_register(suite, test_list_parl_insert_sorted);
    cx_test_register(suite, test_list_arl_remove);
    cx_test_register(suite, test_list_parl_remove);
    cx_test_register(suite, test_list_arl_remove_array);
    cx_test_register(suite, test_list_parl_remove_array);
    cx_test_register(suite, test_list_arl_find_remove);
    cx_test_register(suite, test_list_parl_find_remove);
    cx_test_register(suite, test_list_arl_clear);
    cx_test_register(suite, test_list_parl_clear);
    cx_test_register(suite, test_list_arl_at);
    cx_test_register(suite, test_list_parl_at);
    cx_test_register(suite, test_list_arl_swap);
    cx_test_register(suite, test_list_parl_swap);
    cx_test_register(suite, test_list_arl_swap_no_sbo);
    cx_test_register(suite, test_list_arl_find);
    cx_test_register(suite, test_list_parl_find);
    cx_test_register(suite, test_list_arl_sort);
    cx_test_register(suite, test_list_parl_sort);
    cx_test_register(suite, test_list_arl_reverse);
    cx_test_register(suite, test_list_parl_reverse);
    cx_test_register(suite, test_list_arl_iterator);
    cx_test_register(suite, test_list_parl_iterator);
    cx_test_register(suite, test_list_arl_insert_with_iterator);
    cx_test_register(suite, test_list_parl_insert_with_iterator);
    cx_test_register(suite, test_list_arl_compare_ll);
    cx_test_register(suite, test_list_arl_compare_arl);
    cx_test_register(suite, test_list_arl_compare_pll);
    cx_test_register(suite, test_list_arl_compare_parl);
    cx_test_register(suite, test_list_parl_compare_ll);
    cx_test_register(suite, test_list_parl_compare_arl);
    cx_test_register(suite, test_list_parl_compare_pll);
    cx_test_register(suite, test_list_parl_compare_parl);
    cx_test_register(suite, test_list_arl_simple_destr);
    cx_test_register(suite, test_list_parl_simple_destr);
    cx_test_register(suite, test_list_arl_advanced_destr);
    cx_test_register(suite, test_list_parl_advanced_destr);

    return suite;
}

CxTestSuite *cx_test_suite_array_list_defaulted_funcs(void) {
    CxTestSuite *suite = cx_test_suite_new(
            "array_list with defaulted functions");

    cx_test_register(suite, test_list_arlm_insert_array);
    cx_test_register(suite, test_list_parlm_insert_array);
    cx_test_register(suite, test_list_arlm_insert_sorted);
    cx_test_register(suite, test_list_parlm_insert_sorted);
    cx_test_register(suite, test_list_arlm_swap);
    cx_test_register(suite, test_list_parlm_swap);
    cx_test_register(suite, test_list_arlm_sort);
    cx_test_register(suite, test_list_parlm_sort);

    cx_test_register(suite, test_list_arl_compare_unoptimized);
    cx_test_register(suite, test_list_parl_compare_unoptimized);
    cx_test_register(suite, test_list_arlm_compare_unoptimized);
    cx_test_register(suite, test_list_parlm_compare_unoptimized);

    return suite;
}

CxTestSuite *cx_test_suite_linked_list(void) {
    CxTestSuite *suite = cx_test_suite_new("linked_list");

    cx_test_register(suite, test_linked_list_link_unlink);
    cx_test_register(suite, test_linked_list_at);
    cx_test_register(suite, test_linked_list_find);
    cx_test_register(suite, test_linked_list_compare);
    cx_test_register(suite, test_linked_list_add);
    cx_test_register(suite, test_linked_list_prepend);
    cx_test_register(suite, test_linked_list_insert);
    cx_test_register(suite, test_linked_list_insert_chain);
    cx_test_register(suite, test_linked_list_insert_sorted);
    cx_test_register(suite, test_linked_list_first);
    cx_test_register(suite, test_linked_list_last);
    cx_test_register(suite, test_linked_list_prev);
    cx_test_register(suite, test_linked_list_remove);
    cx_test_register(suite, test_linked_list_remove_chain);
    cx_test_register(suite, test_linked_list_size);
    cx_test_register(suite, test_linked_list_sort_empty);
    cx_test_register(suite, test_linked_list_sort);
    cx_test_register(suite, test_linked_list_reverse);

    cx_test_register(suite, test_list_ll_create);
    cx_test_register(suite, test_list_ll_create_simple);
    cx_test_register(suite, test_list_ll_store_pointers);
    cx_test_register(suite, test_list_ll_create_simple_for_pointers);
    cx_test_register(suite, test_list_pll_destroy_no_destr);
    cx_test_register(suite, test_list_pll_destroy_simple_destr);
    cx_test_register(suite, test_list_pll_destroy_adv_destr);

    cx_test_register(suite, test_list_ll_add);
    cx_test_register(suite, test_list_pll_add);
    cx_test_register(suite, test_list_ll_insert);
    cx_test_register(suite, test_list_pll_insert);
    cx_test_register(suite, test_list_ll_insert_array);
    cx_test_register(suite, test_list_pll_insert_array);
    cx_test_register(suite, test_list_ll_insert_sorted);
    cx_test_register(suite, test_list_pll_insert_sorted);
    cx_test_register(suite, test_list_ll_remove);
    cx_test_register(suite, test_list_pll_remove);
    cx_test_register(suite, test_list_ll_remove_array);
    cx_test_register(suite, test_list_pll_remove_array);
    cx_test_register(suite, test_list_ll_find_remove);
    cx_test_register(suite, test_list_pll_find_remove);
    cx_test_register(suite, test_list_ll_clear);
    cx_test_register(suite, test_list_pll_clear);
    cx_test_register(suite, test_list_ll_at);
    cx_test_register(suite, test_list_pll_at);
    cx_test_register(suite, test_list_ll_swap);
    cx_test_register(suite, test_list_pll_swap);
    cx_test_register(suite, test_list_ll_swap_no_sbo);
    cx_test_register(suite, test_list_ll_find);
    cx_test_register(suite, test_list_pll_find);
    cx_test_register(suite, test_list_ll_sort);
    cx_test_register(suite, test_list_pll_sort);
    cx_test_register(suite, test_list_ll_reverse);
    cx_test_register(suite, test_list_pll_reverse);
    cx_test_register(suite, test_list_ll_iterator);
    cx_test_register(suite, test_list_pll_iterator);
    cx_test_register(suite, test_list_ll_insert_with_iterator);
    cx_test_register(suite, test_list_pll_insert_with_iterator);
    cx_test_register(suite, test_list_ll_compare_ll);
    cx_test_register(suite, test_list_ll_compare_arl);
    cx_test_register(suite, test_list_ll_compare_pll);
    cx_test_register(suite, test_list_ll_compare_parl);
    cx_test_register(suite, test_list_pll_compare_ll);
    cx_test_register(suite, test_list_pll_compare_arl);
    cx_test_register(suite, test_list_pll_compare_pll);
    cx_test_register(suite, test_list_pll_compare_parl);
    cx_test_register(suite, test_list_ll_simple_destr);
    cx_test_register(suite, test_list_pll_simple_destr);
    cx_test_register(suite, test_list_ll_advanced_destr);
    cx_test_register(suite, test_list_pll_advanced_destr);

    return suite;
}

CxTestSuite *cx_test_suite_linked_list_defaulted_funcs(void) {
    CxTestSuite *suite = cx_test_suite_new(
            "linked_list with defaulted functions");

    cx_test_register(suite, test_list_llm_insert_array);
    cx_test_register(suite, test_list_pllm_insert_array);
    cx_test_register(suite, test_list_llm_insert_sorted);
    cx_test_register(suite, test_list_pllm_insert_sorted);
    cx_test_register(suite, test_list_llm_swap);
    cx_test_register(suite, test_list_pllm_swap);
    cx_test_register(suite, test_list_llm_sort);
    cx_test_register(suite, test_list_pllm_sort);

    cx_test_register(suite, test_list_ll_compare_unoptimized);
    cx_test_register(suite, test_list_pll_compare_unoptimized);
    cx_test_register(suite, test_list_llm_compare_unoptimized);
    cx_test_register(suite, test_list_pllm_compare_unoptimized);

    return suite;
}

CxTestSuite *cx_test_suite_empty_list(void) {
    CxTestSuite *suite = cx_test_suite_new("empty list dummy");

    cx_test_register(suite, test_empty_list_size);
    cx_test_register(suite, test_empty_list_iterator);
    cx_test_register(suite, test_empty_list_noops);
    cx_test_register(suite, test_empty_list_at);
    cx_test_register(suite, test_empty_list_find);
    cx_test_register(suite, test_empty_list_compare);

    return suite;
}