def METHOD_NAME() -> None:
    """Test merge dicts."""
    src = {'a': 5, 'b': 8, 'c': 9}
    dest = {'a': 7, 'c': 4, 'e': 1}
    merged = list_utils.merge_dicts(dest, src)
    assert merged == {'a': 5, 'b': 8, 'c': 9, 'e': 1}
    assert list_utils.merge_dicts(dest, None) == dest
    assert list_utils.merge_dicts(None, None) == {}
    assert list_utils.merge_dicts(None, src) == src
    assert list_utils.merge_dicts({}, {}) == {}