Function test_sequential_container_front_back

tests/test_container_helpers.h:621–630

// a COMPILER ERROR (not silent skipping).
template<typename Container>
void test_sequential_container_front_back() {
    Container c;
    populate(c, make_shared_int(1));
    populate(c, make_shared_int(2));
    populate(c, make_shared_int(3));

    // Test front and back - COMPILER ERROR if these methods don't exist
    FL_CHECK(*c.front() == 1);
    FL_CHECK(*c.back() == 3);
}

// Test resize for sequential containers
// NOTE: No enable_if - if a container doesn't have resize, you get