"""Import stub for mock library.
"""
from __future__ import absolute_import
from ..util import py33

if py33:
    from unittest.mock import MagicMock, Mock, call
else:
    try:
        from mock import MagicMock, Mock, call
    except ImportError:
        raise ImportError(
                "SQLAlchemy's test suite requires the "
                "'mock' library as of 0.8.2.")