Function test_map_bounds

tests/test_container_helpers.h:937–959

// Verifies: binary search operations return valid iterators
template<template<typename, typename> class MapTemplate>
void test_map_bounds() {
    using MapContainer = MapTemplate<int, fl::shared_ptr<int>>;

    MapContainer m;
    populate_map(m, 10, make_shared_int(100));
    populate_map(m, 20, make_shared_int(200));
    populate_map(m, 30, make_shared_int(300));

    // Test lower_bound
    auto lower = m.lower_bound(15);
    FL_CHECK(lower != m.end());
    FL_CHECK(lower->first >= 15);

    // Test upper_bound
    auto upper = m.upper_bound(20);
    FL_CHECK(upper != m.end());
    FL_CHECK(upper->first > 20);

    // Test equal_range
    auto range = m.equal_range(20);
    FL_CHECK(range.first != m.end());
    FL_CHECK(range.first->first == 20);
}

// Test insert and erase with iterators
// Verifies: insert returns valid iterator, erase returns next iterator