def METHOD_NAME(new_archive):
    """Check if old extras are fully overwritten by the imported ones
    (keep original, not create new, leave original)"""
    imported_node = import_extras(new_archive)
    imported_node = modify_extras(new_archive, imported_node, mode_existing=('k', 'n', 'l'))
    # Check if extras are imported correctly
    assert imported_node.base.extras.get('b') == 1000
    assert imported_node.base.extras.get('a') == 1
    with pytest.raises(AttributeError):  # the extra
        # 'c' should not exist, as the extras were keept untached
        imported_node.base.extras.get('c')