#include <criterion/criterion.h>

#include "tupperware/vector.h"

struct vector v;
const size_t init_n = 42;

static void setup(void) {

    v = (struct vector){
        .arr = calloc(init_n, sizeof(int)),
        .nmemb = 0,
        .size = sizeof(int),
        .cap = init_n,
    };
}

static void teardown(void) {
    free(v.arr);
}

TestSuite(vector, .timeout = 15, .init = setup, .fini = teardown);

Test(vector, init_null) {
    cr_assert_not(vector_init(NULL, 1));
}

Test(vector, init_zero) {
    struct vector vec;
    cr_assert_not(vector_init(&vec, 0));
}

Test(vector, init) {
    struct vector vec;

    cr_assert(vector_init(&vec, 1));

    cr_assert_eq(vec.size, 1);
    cr_assert_eq(vec.cap, 0);
    cr_assert_eq(vec.nmemb, 0);
    cr_assert_null(vec.arr);
}

Test(vector, with_cap_null) {
    cr_assert_not(vector_with_cap(NULL, 1, 1));
}

Test(vector, with_cap_zero_size) {
    struct vector vec;
    cr_assert_not(vector_with_cap(&vec, 0, 1));
}

Test(vector, with_cap) {
    struct vector vec;

    cr_assert(vector_with_cap(&vec, 1, 1));

    cr_assert_eq(vec.size, 1);
    cr_assert_eq(vec.cap, 1);
    cr_assert_eq(vec.nmemb, 0);
    cr_assert_not_null(vec.arr);

    free(vec.arr);
}

Test(vector, with_cap_overflow) {
    struct vector vec;

    cr_assert_not(vector_with_cap(&vec, -1, -1));
}

static void int_dtor(void *val, void *cookie) {
    int *n = val;
    int *count = cookie;

    if (count)
        cr_assert_eq(*n, (*count)++);
}

Test(vector, clear_null) {
    int count = 0;

    vector_clear(NULL, int_dtor, &count);

    cr_assert_eq(count, 0);
}

static void fill_v(void) {
    int *arr = v.arr;
    for (size_t i = 0; i < v.cap; ++i) {
        arr[v.nmemb++] = i;
    }
}

Test(vector, clear_no_dtor) {
    fill_v();

    vector_clear(&v, NULL, NULL);

    cr_assert_null(v.arr);
    cr_assert_eq(v.size, 0);
    cr_assert_eq(v.cap, 0);
    cr_assert_eq(v.nmemb, 0);
}

Test(vector, clear) {
    fill_v();
    int count = 0;

    vector_clear(&v, int_dtor, &count);

    cr_assert_eq(count, init_n);
}

Test(vector, reserve_null) {
    cr_assert_not(vector_reserve(NULL, 0));
}

Test(vector, reserve_zero) {
    void *prev_arr = v.arr;
    size_t prev_cap = v.cap;

    cr_assert(vector_reserve(&v, 0));

    cr_assert_eq(v.arr, prev_arr);
    cr_assert_eq(v.cap, prev_cap);
}

Test(vector, reserve_less_than_cap) {
    void *prev_arr = v.arr;
    size_t prev_cap = v.cap;

    cr_assert(vector_reserve(&v, init_n - 1));

    cr_assert_eq(v.arr, prev_arr);
    cr_assert_eq(v.cap, prev_cap);
}

Test(vector, reserve_cap) {
    void *prev_arr = v.arr;
    size_t prev_cap = v.cap;

    cr_assert(vector_reserve(&v, init_n));

    cr_assert_eq(v.arr, prev_arr);
    cr_assert_eq(v.cap, prev_cap);
}

Test(vector, reserve_overflow) {
    void *prev_arr = v.arr;
    size_t prev_cap = v.cap;

    cr_assert_not(vector_reserve(&v, -1));

    cr_assert_eq(v.arr, prev_arr);
    cr_assert_eq(v.cap, prev_cap);
}

Test(vector, reserve) {
    cr_assert(vector_reserve(&v, 2 * init_n));

    cr_assert_eq(v.cap, 2 * init_n);
}

Test(vector, length_null) {
    cr_assert_eq(vector_length(NULL), 0);
}

Test(vector, length_empty) {
    cr_assert_eq(vector_length(&v), 0);
}

Test(vector, length) {
    fill_v();
    cr_assert_eq(vector_length(&v), init_n);
}

Test(vector, capacity_null) {
    cr_assert_eq(vector_capacity(NULL), 0);
}

Test(vector, capacity_empty) {
    cr_assert_eq(vector_capacity(&v), init_n);
}

Test(vector, capacity) {
    fill_v();
    cr_assert_eq(vector_capacity(&v), init_n);
}

Test(vector, elem_size_null) {
    cr_assert_eq(vector_elem_size(NULL), 0);
}

Test(vector, elem_size) {
    fill_v();
    cr_assert_eq(vector_elem_size(&v), sizeof(int));
}

Test(vector, empty_null) {
    cr_assert(vector_empty(NULL));
}

Test(vector, empty_empty) {
    cr_assert(vector_empty(&v));
}

Test(vector, empty) {
    fill_v();
    cr_assert_not(vector_empty(&v));
}

Test(vector, at_null) {
    cr_assert_null(vector_at(NULL, 0));
}

Test(vector, at_empty) {
    cr_assert_null(vector_at(&v, 0));
}

Test(vector, at_out_of_range) {
    fill_v();

    cr_assert_null(vector_at(&v, -1));
}

Test(vector, at) {
    fill_v();

    int *arr = v.arr;
    for (size_t i = 0; i < init_n; ++i)
        cr_assert_eq(vector_at(&v, i), &arr[i]);
}

Test(vector, push_back_null) {
    cr_assert_not(vector_push_back(NULL, NULL));

    cr_assert_not(vector_push_back(&v, NULL));

    int n = 42;
    cr_assert_not(vector_push_back(NULL, &n));
}

Test(vector, push_back_empty) {
    int n = 42;
    cr_assert(vector_push_back(&v, &n));

    int *varr = v.arr;
    cr_assert_eq(varr[0], 42);
    cr_assert_eq(v.nmemb, 1);
}

Test(vector, push_back) {
    int n = 42;
    fill_v();

    cr_assert(vector_push_back(&v, &n));

    int *varr = v.arr;
    cr_assert_eq(varr[init_n], 42);
    cr_assert_eq(v.nmemb, init_n + 1);
}

Test(vector, insert_at_null) {
    cr_assert_not(vector_insert_at(NULL, NULL, 0));

    cr_assert_not(vector_insert_at(&v, NULL, 0));

    int n = 42;
    cr_assert_not(vector_insert_at(NULL, &n, 0));
}

Test(vector, insert_at_empty_out_of_bounds) {
    int n = 42;
    cr_assert(vector_insert_at(&v, &n, -1));

    int *varr = v.arr;
    cr_assert_eq(varr[0], 42);
    cr_assert_eq(v.nmemb, 1);
}

Test(vector, insert_at_empty) {
    int n = 42;
    cr_assert(vector_insert_at(&v, &n, 0));

    int *varr = v.arr;
    cr_assert_eq(varr[0], 42);
    cr_assert_eq(v.nmemb, 1);
}

Test(vector, insert_at_out_of_bounds) {
    fill_v();
    int n = 42;
    cr_assert(vector_insert_at(&v, &n, -1));

    int *varr = v.arr;
    cr_assert_eq(varr[init_n], 42);
    cr_assert_eq(v.nmemb, init_n + 1);

    for (size_t i = 0; i < init_n; ++i)
        cr_assert_eq(varr[i], i);
}

Test(vector, insert_at_begin) {
    fill_v();
    int n = 42;
    cr_assert(vector_insert_at(&v, &n, 0));

    int *varr = v.arr;
    cr_assert_eq(varr[0], 42);
    cr_assert_eq(v.nmemb, init_n + 1);

    for (size_t i = 0; i < init_n; ++i)
        cr_assert_eq(varr[i + 1], i);
}

Test(vector, insert_at) {
    fill_v();
    int n = 42;
    cr_assert(vector_insert_at(&v, &n, 2));

    int *varr = v.arr;
    cr_assert_eq(varr[2], 42);
    cr_assert_eq(v.nmemb, init_n + 1);

    for (size_t i = 0; i < init_n; ++i)
        cr_assert_eq(varr[i + (i >= 2)], i);
}

Test(vector, pop_back_null) {
    cr_assert_not(vector_pop_back(NULL, NULL));
}

Test(vector, pop_back_empty) {
    cr_assert_not(vector_pop_back(&v, NULL));
}

Test(vector, pop_back_null_output) {
    fill_v();
    cr_assert(vector_pop_back(&v, NULL));

    cr_assert_eq(v.nmemb, init_n - 1);
}

Test(vector, pop_back_once) {
    fill_v();
    int res = 42;
    cr_assert(vector_pop_back(&v, &res));

    cr_assert_eq(res, init_n - 1);
    cr_assert_eq(v.nmemb, init_n - 1);
}

Test(vector, pop_back) {
    fill_v();
    int res = 42;
    for (size_t i = 0; i < init_n; ++i) {
        cr_assert(vector_pop_back(&v, &res));
        cr_assert_eq(res, init_n - i - 1);
    }

    cr_assert_not(vector_pop_back(&v, &res));
    cr_assert_eq(v.nmemb, 0);
}

Test(vector, pop_at_null) {
    cr_assert_not(vector_pop_at(NULL, NULL, 0));
}

Test(vector, pop_at_empty) {
    cr_assert_not(vector_pop_at(&v, NULL, 0));
}

Test(vector, pop_at_null_output_begin) {
    fill_v();
    cr_assert(vector_pop_at(&v, NULL, 0));

    cr_assert_eq(v.nmemb, init_n - 1);
    int *varr = v.arr;
    for (size_t i = 0; i < (init_n - 1); ++i) {
        cr_assert_eq(varr[i], i + 1);
    }
}

Test(vector, pop_at_once_begin) {
    fill_v();
    int res = 42;
    cr_assert(vector_pop_at(&v, &res, 0));

    cr_assert_eq(res, 0);
    cr_assert_eq(v.nmemb, init_n - 1);

    int *varr = v.arr;
    for (size_t i = 0; i < (init_n - 1); ++i) {
        cr_assert_eq(varr[i], i + 1);
    }
}

Test(vector, pop_at_once_middle) {
    fill_v();
    int res = 42;
    cr_assert(vector_pop_at(&v, &res, 2));

    cr_assert_eq(res, 2);
    cr_assert_eq(v.nmemb, init_n - 1);

    int *varr = v.arr;
    for (size_t i = 0; i < (init_n - 1); ++i) {
        cr_assert_eq(varr[i], i + (i >= 2));
    }
}

Test(vector, pop_at) {
    fill_v();
    int res = 42;
    for (size_t i = 0; i < init_n; ++i) {
        cr_assert(vector_pop_at(&v, &res, 0));
        cr_assert_eq(res, i);
    }

    cr_assert_not(vector_pop_at(&v, &res, 0));
    cr_assert_eq(v.nmemb, 0);
}

static int int_cmp(const void *lhs, const void *rhs, void *cookie) {
    const int *l = lhs;
    const int *r = rhs;
    int *count = cookie;

    ++*count;

    if (*l < *r)
        return -1;
    return (*l > *r);
}

Test(vector, is_max_heap_null) {
    int count = 0;

    cr_assert(vector_is_max_heap(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_max_heap_empty) {
    int count = 0;

    cr_assert(vector_is_max_heap(&v, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_max_heap_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;

    cr_assert(vector_is_max_heap(&v, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_max_heap_sorted) {
    int count = 0;
    fill_v();

    cr_assert_not(vector_is_max_heap(&v, int_cmp, &count));

    cr_assert_gt(count, 0);
    // A complete tree has (N - 1) internal connections
    cr_assert_leq(count, init_n - 1);
}

Test(vector, is_max_heap_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;

    cr_assert(vector_is_max_heap(&v, int_cmp, &count));

    // A complete tree has (N - 1) internal connections, we check all of them
    cr_assert_eq(count, init_n - 1);
}

Test(vector, make_heap_null) {
    int count = 0;

    cr_assert_not(vector_make_heap(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, make_heap_empty) {
    int count = 0;

    cr_assert_not(vector_make_heap(&v, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, make_heap_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;

    cr_assert(vector_make_heap(&v, int_cmp, &count));

    cr_assert(vector_is_max_heap(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, make_heap) {
    fill_v();
    int count = 0;

    cr_assert(vector_make_heap(&v, int_cmp, &count));

    cr_assert(vector_is_max_heap(&v, int_cmp, &count));
    cr_assert_neq(count, 0);
}

static void fill_v_heap(void) {
    int *arr = v.arr;
    for (size_t i = 0; i < v.cap; ++i) {
        arr[v.nmemb++] = init_n - i - 1;
    }

    int count = 0;
    vector_make_heap(&v, int_cmp, &count);
}

Test(vector, push_heap_null) {
    int count = 0;
    cr_assert_not(vector_push_heap(NULL, NULL, int_cmp, &count));

    int n = 42;
    cr_assert_not(vector_push_heap(&v, NULL, int_cmp, &count));
    cr_assert_not(vector_push_heap(NULL, &n, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, push_heap_empty) {
    int n = 42;

    int count = 0;
    cr_assert(vector_push_heap(&v, &n, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, push_heap_full) {
    fill_v_heap();
    int n = 42;

    int count = 0;
    cr_assert(vector_push_heap(&v, &n, int_cmp, &count));

    cr_assert_neq(count, 0);
    cr_assert_eq(v.nmemb, init_n + 1);
    cr_assert(vector_is_max_heap(&v, int_cmp, &count));
}

Test(vector, push_heap_sorted) {
    int count = 0;

    for (size_t i = 0; i < init_n; ++i) {
        int n = i;
        cr_assert(vector_push_heap(&v, &n, int_cmp, &count));
        cr_assert(vector_is_max_heap(&v, int_cmp, &count));
        cr_assert_eq(v.nmemb, i + 1);
    }
}

Test(vector, push_heap_inverse_sorted) {
    int count = 0;

    for (size_t i = 0; i < init_n; ++i) {
        int n = init_n - i - 1;
        cr_assert(vector_push_heap(&v, &n, int_cmp, &count));
        cr_assert(vector_is_max_heap(&v, int_cmp, &count));
        cr_assert_eq(v.nmemb, i + 1);
    }
}

Test(vector, push_heap_same) {
    int count = 0;

    for (size_t i = 0; i < init_n; ++i) { // Use underflow to stop
        int n = 0;
        cr_assert(vector_push_heap(&v, &n, int_cmp, &count));
        cr_assert(vector_is_max_heap(&v, int_cmp, &count));
        cr_assert_eq(v.nmemb, i + 1);
    }
}

Test(vector, pop_heap_null) {
    int count = 0;
    cr_assert_not(vector_pop_heap(NULL, NULL, int_cmp, &count));

    int n = 42;
    cr_assert_not(vector_pop_heap(&v, NULL, int_cmp, &count));
    cr_assert_not(vector_pop_heap(NULL, &n, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, pop_heap_empty) {
    int n = 42;

    int count = 0;
    cr_assert_not(vector_pop_heap(&v, &n, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, pop_heap_one_null_output) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;

    cr_assert(vector_pop_heap(&v, NULL, int_cmp, &count));
    cr_assert_eq(v.nmemb, 0);
}

Test(vector, pop_heap_full) {
    fill_v_heap();
    int n = 42;

    int count = 0;
    cr_assert(vector_pop_heap(&v, &n, int_cmp, &count));

    cr_assert_neq(count, 0);
    cr_assert_eq(n, init_n - 1);
    cr_assert_eq(v.nmemb, init_n - 1);
    cr_assert(vector_is_max_heap(&v, int_cmp, &count));
}

Test(vector, pop_heap) {
    fill_v_heap();

    int count = 0;
    for (size_t i = 0; i < init_n; ++i) { // Use underflow to stop
        int n = 42;
        cr_assert(vector_pop_heap(&v, &n, int_cmp, &count));
        cr_assert_eq(n, init_n - i - 1);
        cr_assert(vector_is_max_heap(&v, int_cmp, &count));
    }

    cr_assert_eq(v.nmemb, 0);
}

Test(vector, is_sorted_null) {
    int count = 0;

    cr_assert(vector_is_sorted(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_sorted_empty) {
    int count = 0;

    cr_assert(vector_is_sorted(&v, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_sorted_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;

    cr_assert(vector_is_sorted(&v, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, is_sorted_sorted) {
    int count = 0;
    fill_v();

    cr_assert(vector_is_sorted(&v, int_cmp, &count));

    cr_assert_eq(count, init_n - 1);
}

Test(vector, is_sorted_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;

    cr_assert_not(vector_is_sorted(&v, int_cmp, &count));

    cr_assert_lt(count, init_n - 1);
}

Test(vector, insert_sort_null) {
    int count = 0;
    cr_assert(vector_insert_sort(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, insert_sort_empty) {
    int count = 0;
    cr_assert(vector_insert_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, insert_sort_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;
    cr_assert(vector_insert_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

static void assert_sorted(void) {
    int *varr = v.arr;
    for (size_t i = 0; i < init_n; ++i) {
        cr_assert_eq(varr[i], i);
    }
}

Test(vector, insert_sort_sorted) {
    fill_v();
    int count = 0;
    cr_assert(vector_insert_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, insert_sort_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;
    cr_assert(vector_insert_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, heap_sort_null) {
    int count = 0;
    cr_assert(vector_heap_sort(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, heap_sort_empty) {
    int count = 0;
    cr_assert(vector_heap_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, heap_sort_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;
    cr_assert(vector_heap_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, heap_sort_sorted) {
    fill_v();
    int count = 0;
    cr_assert(vector_heap_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, heap_sort_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;
    cr_assert(vector_heap_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, merge_sort_null) {
    int count = 0;
    cr_assert(vector_merge_sort(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, merge_sort_empty) {
    int count = 0;
    cr_assert(vector_merge_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, merge_sort_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;
    cr_assert(vector_merge_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, merge_sort_sorted) {
    fill_v();
    int count = 0;
    cr_assert(vector_merge_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, merge_sort_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;
    cr_assert(vector_merge_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, sort_null) {
    int count = 0;
    cr_assert(vector_sort(NULL, int_cmp, &count));

    cr_assert_eq(count, 0);
}

Test(vector, sort_empty) {
    int count = 0;
    cr_assert(vector_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, sort_one) {
    int *arr = v.arr;
    arr[v.nmemb++] = 42;
    int count = 0;
    cr_assert(vector_sort(&v, int_cmp, &count));

    cr_assert(vector_is_sorted(&v, int_cmp, &count));
    cr_assert_eq(count, 0);
}

Test(vector, sort_sorted) {
    fill_v();
    int count = 0;
    cr_assert(vector_sort(&v, int_cmp, &count));

    assert_sorted();
}

Test(vector, sort_inverse_sorted) {
    for (size_t i = 0; i < init_n; ++i) {
        int *arr = v.arr;
        arr[v.nmemb++] = init_n - i - 1;
    }
    int count = 0;
    cr_assert(vector_sort(&v, int_cmp, &count));

    assert_sorted();
}

static bool int_even(void *v, void *cookie) {
    int *count = cookie;
    ++*count;

    int *val = v;

    return *val % 2 == 0;
}

Test(vector, filter_null) {
    int count = 0;

    cr_assert_not(vector_filter(NULL, NULL, int_even, &count));
    cr_assert_eq(count, 0);

    struct vector v;
    cr_assert_not(vector_filter(&v, NULL, int_even, &count));
    cr_assert_eq(count, 0);
    cr_assert_not(vector_filter(NULL, &v, int_even, &count));
    cr_assert_eq(count, 0);
}

Test(vector, filter_empty) {
    int count = 0;

    cr_assert(vector_filter(&v, &v, int_even, &count));
    cr_assert_eq(count, 0);
}

Test(vector, filter) {
    fill_v();
    int count = 0;
    struct vector res;
    cr_assert(vector_with_cap(&res, v.size, v.nmemb));

    cr_assert(vector_filter(&res, &v, int_even, &count));

    cr_assert_eq(count, init_n);
    cr_assert_eq(v.nmemb + res.nmemb, init_n);

    int *varr  = v.arr;
    int *rarr = res.arr;
    for (size_t i = 0; i < init_n; ++i) {
        if (i % 2)
            cr_assert_eq(varr[i / 2], i);
        else
            cr_assert_eq(rarr[i / 2], i);
    }

    vector_clear(&res, NULL, NULL);
}

static void int_incr(void *v, void *cookie) {
    int *count = cookie;
    ++*count;

    int *val = v;
    ++*val;
}

Test(vector, map_null) {
    int count = 0;
    vector_map(NULL, int_incr, &count);
    cr_assert_eq(count, 0);
}

Test(vector, map_empty) {
    int count = 0;
    vector_map(&v, int_incr, &count);
    cr_assert_eq(count, 0);
}

Test(vector, map) {
    fill_v();
    int count = 0;
    vector_map(&v, int_incr, &count);
    cr_assert_eq(count, init_n);

    int *varr = v.arr;
    for (size_t i = 0; i < v.nmemb; ++i) {
        cr_assert_eq(varr[i], i + 1);
    }
}