Function test_map_iteration_key_value

tests/test_container_helpers.h:864–881

// Verifies: pair<Key, Value> dereferencing
template<template<typename, typename> class MapTemplate>
void test_map_iteration_key_value() {
    using MapContainer = MapTemplate<int, fl::shared_ptr<int>>;

    MapContainer m;
    populate_map(m, 100, make_shared_int(1000));
    populate_map(m, 200, make_shared_int(2000));

    int key_sum = 0;
    int value_sum = 0;

    for (auto it = m.begin(); it != m.end(); ++it) {
        key_sum += it->first;
        value_sum += *it->second;
    }

    FL_CHECK(key_sum == 300);  // 100 + 200
    FL_CHECK(value_sum == 3000);  // 1000 + 2000
}

// Test map lookup and iteration consistency
// Verifies: find() returns valid iterator, dereferencing works